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Test Z: INTERMITTENTS

WARNING: This page is about a different variant/trim than selected.

Perform this test when instructed during QUICK TEST or if directed here by other test procedures. This system test is intended to diagnose and isolate intermittent concerns for the following:

The intermittent test table is used to determine which test to perform for the suspect circuit. See INTERMITTENT TEST  table. Corresponding Parameter Identification (PID) for each circuit are listed. Some circuits do not have an associated PID and can be measured with a Digital Volt-Ohmmeter (DVOM). If vehicle has coil pack ignition system with a no-start condition, perform ignition test. Go to step  21.

INTERMITTENT TEST

PID Associated Circuit Test Type
4X4L 4WD LOW Input
ACCS A/CCS Input
ACP & ACP V A/CP Input
AIR B AIRB Output
AIR D AIRD Output
BPP/BOO BPP Input
CAS GND CASE GND Input
CCS CCS Output
(1) CD-1 (Primary) Output
(1) CD-2 (Primary) Output
(1) CD-3 (Primary) Output
(1) CD-4 (Primary) Output
(1) CD-5 (Primary) Output
(1) CD-6 (Primary) Output
(1) CD-7 (Primary) Output
(1) CD-8 (Primary) Output
(1) CD-9 (Primary) Output
(1) CD-10 (Primary) Output
CHT & CHT V CHT Input
CHTIL CHTL Output
(1) CKP+ Input
(1) CMP Input
CPP/PNP CPP Input
(1) CTO Output
(1) DOL Output
DPFEGR DPEGR Input
AIR EAIR Output
AIRA & AIRM EAIRM Input
ECT & ECT V ECT Input
EFTA & EFTA V EFT-A Input
EFTB & EFTB V EFT-B Input
EGRVR EGRVR Output
EPC & EPC V EPC Output
EVAPCP & EVAPDC EVAPCP Output
EVAPCV EVAPCV Output
EVAPPF EVAPPF Input
LFC FC Output
FF FF Input
FLI & FLI V FLI Input
FP FP Output
FPM & FP M FPM Input
FRP & FRP V FRP Input
FSV FSV Output
FSVM FSVM Input
FTP & FTP V EFTP Input
HFC HFC Output
O2S11 HO2S-11 Input
O2S12 HO2S-12 Input
O2S21 HO2S-21 Input
O2S22 HO2S-22 Input
HTR11 HTR-11 Output
HTR12 HTR-12 Output
HTR21 HTR-21 Output
HTR22 HTR-22 Output
IAC IAC Output
IAT & IAT V IAT Input
IMRC IMRC Output
IMRCM IMRCM Input
IMTV IMT Valve Output
FUELPW1 INJ-1 Output
FUELPW2 INJ-2 Output
FUELPW1 INJ-3 Output
FUELPW1 INJ-4 Output
FUELPW1 Or FUELPW2 INJ-5 Output
FUELPW1 Or FUELPW2 INJ-6 Output
FUELPW1 Or FUELPW2 INJ-7 Output
FUELPW2 INJ-8 Output
FUELPW2 INJ-9 Output
FUELPW2 INJ-10 Output
KS1 & KS2 KS Input
LFC LFC Output
(1) LFP Output
MAF & MAF V MAF Input
MIL MIL Output
OCTADJ OCT ADJ Input
OSS OSS Input
CPP/PNP PNP Input
PSP & PSP V PSP Input
PTO PTO Input
(1) SIL Output
SS1 SS1 Output
SS2 SS2 Output
SS3 SS3 Output
TCC TCC Output
TCIL TCIL Output
TCS TCS Input
TFT & TFT V TFT Input
TP & TP V TP Input
TPB & TPB V TPB Input
TR & TR V TR Input
CAMDCR & RCAM VCT Output
VPWR VPWR Input
(1) VREF Output
VSS VSS+ Input
WAC WAC Output
(1) PID is not available for this circuit. Use DVOM.
Fig 1: Testing Typical PCM Output Control Circuit
G95J27234Courtesy of FORD MOTOR CO.

  1. Direction For Intermittent Diagnostic Path

    There are 2 main procedures used in this circuit test to isolate. Repair an intermittent condition. One procedure uses the Rotunda Distributorless Ignition System (DIS) Tester (007-00075) and the other uses an NGS tester and a Digital Volt-Ohmmeter (DVOM). The distributorless ignition system tester is used on vehicles with coil pack ignition systems. If vehicle has an ignition condition and is equipped with coil pack ignition, go to step  21. If vehicle is not as described, go to next step.

  2. Perform PCM Reset Procedure

    If PCM reset procedure has already been performed, go to next step. If PCM reset procedure has not been performed, perform appropriate reset procedure. See COMPUTER RELEARN PROCEDURE in GENERAL INFORMATION. Ensure freeze frame data has been recorded before resetting PCM. After performing PCM reset procedure, go to next step.

  3. Select PIDs Related To Symptom

    NGS tester and a list of PIDs must be used to indicate area of fault. Obtain symptom from customer description. Use REFERENCE VALUE SYMPTOM table and REFERENCE VALUE/PID MEASUREMENT SIGNAL table to identity PIDs that relate to symptom. See appropriate PIN VOLTAGE/PID VALUE CHARTS article in ENGINE PERFORMANCE. Make a list of symptom related PIDs and go to next step.

  4. Symptom Verification

    Path to symptom verification is optional, but is recommended for the following reasons:
    • If vehicle is in for a repeat repair.
    • No DTCs are present.
    • Customer has difficulty describing symptom.

    If symptom needs to be verified, go to next step. If symptom is known and does not need to be verified, go to step  11.

  5. Note All Available Data To Aid In Symptom Verification

    Collect as much data as possible to aid in determining intermittent fault area. Note any freeze frame data recorded in step 2)  . Note any continuous memory codes present prior to performing COMPUTER RELEARN PROCEDURE in step 2)  . Obtain any information from customer that would aid in determining fault area. Go to next step.
    6. NOTE: A road test may be necessary to recreate conditions that originally caused DTC to set.

  6. Attempt To Recreate Symptom
    Using NGS tester, select and monitor PIDs displayed in freeze frame data (if available) and PIDs on list that were developed in step 3)  . Using freeze frame data recorded earlier, recreate conditions described by each freeze frame PID. Pay particular attention to ECT LOAD, RPM and VSS PIDs. Use any information available from customer to aid in producing conditions for recreating symptom. When symptom occurs, press trigger on NGS tester to begin recording. Refer to NGS tester instruction manual for recorder function operation. If symptom is reproduced, go to step  11. If symptom cannot be reproduced, go to next step.
    7. NOTE: PIDs for PCM outputs in pin voltage/PID value charts in appropriate PIN VOLTAGE/PID VALUE CHARTS article in ENGINE PERFORMANCE represent commanded values only. Circuit measurements made with DVOM indicate actual output status. If circuit measurement made with a DVOM differs from NGS tester PID value, a circuit fault may be indicated. PIDs for PCM inputs that differ from circuit measurements made with a DVOM indicate a possible PCM fault.

  7. Recreate Symptom Using Intermittent Road Test
    The intermittent road test procedure is the last attempt to locate area of condition before physically disturbing vehicle circuits. Road test is a set of instructions for monitoring PID values or making circuit measurements with a DVOM. Procedure is performed under 4 conditions: Key On Engine Off (KOEO), hot idle, with vehicle speed at 30 MPH and 55 MPH. On part of procedure that requires a road test at 30 MPH and 55 MPH, a ride along assistant is necessary. Use PID values and circuit values in pin voltage/PID value charts to compare with actual PID values and circuit measurements made during road test. To perform KOEO part of procedure, locate pin voltage/PID value chart in appropriate PIN VOLTAGE/PID VALUE CHARTS article in ENGINE PERFORMANCE. Turn ignition switch to ON position. Using NGS tester, select and monitor PID values. Using a DVOM, measure circuits at breakout box identified in pin voltage/PID value charts. Compare NGS tester PID values with circuit values made with DVOM. If any values are out of range, go to step  11. If all values are in range, go to next step.

  8. Recreate Symptom Using Hot Idle Road Test Procedure

    Start engine and allow to idle. Ensure engine is at normal operating temperature. Continue to monitor same PIDs and circuits as in step 7)  . If any values are out of range, go to step  11. If all values are in range, go to next step.

  9. Recreate Symptom Using 30 MPH Road Test

    Road test vehicle at 30 MPH and continue to monitor same PIDs and circuits as in step 7)  . If any values are out of range, go to step  11. If all values are in range, go to next step.

  10. Recreate Symptom Using 55 MPH Road Test

    Road test vehicle at 55 MPH and continue to monitor same PIDs and circuits as in step 7)  . If any values are out of range, go to next step. If all values are in range, it is now necessary to physically disturb selected circuit in an attempt to recreate intermittent condition. Go to next step.

  11. Select Circuits To Be Tested From Intermittent Test Table

    Remain in NGS tester PID selection menu. If steps 7)  -10)  (intermittent road tests) were performed, select PIDs or circuits that values did not match PID values or circuit values made using DVOM and pin voltage/PID value chart. If steps 7)  -10)  were not performed, select PIDs from PID list made in step 3)  . On all applications, see INTERMITTENT TEST  table. Match selected PIDs to corresponding circuit in INTERMITTENT TEST table. It is possible to have more than one circuit to test. If a PID recording was made with NGS tester in step 6)  , it may be helpful to replay recording at this time. Using INTERMITTENT TEST table, determine test to perform (input or output). To perform input test, go to next step. To perform output test, go to step  16.

  12. KOEO Intermittent Input Test

    Using circuits selected from INTERMITTENT TEST  table, select only recommended PIDs to monitor with NGS tester. If a PID is not available for a circuit, use a DVOM to monitor circuit. Turn ignition switch to ON position. Locate area of suspect wiring or component fault. If input is a switch-type component, turn switch on manually. While observing PID/DVOM value, wiggle and pull on component wiring and connector. Lightly tap on component. If a fault is indicated, value will suddenly change. For correct values, see appropriate PIN VOLTAGE/PID VALUE CHARTS article in ENGINE PERFORMANCE. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.

  13. KOER Intermittent Input Test

    Start engine and allow it to idle. Continue to monitor PIDs and/or circuits as in step 12)  . Turn ignition switch to ON position. Locate area of suspect wiring or component fault. If input is a switch-type component, turn switch on manually. While observing PID/DVOM value, wiggle and pull on component wiring and connector. Lightly tap on component. If a fault is indicated, value will suddenly change. For correct values, see HOT IDLE values in pin voltage/PID value chart in appropriate PIN VOLTAGE/PID VALUE CHARTS article in ENGINE PERFORMANCE. If no fault is indicated, turn ignition switch to OFF position and go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.

  14. KOEO Intermittent Water Soak Test

    Turn ignition switch to ON position. Continue to monitor PIDs and/or circuits as in step 13)  . Locate area of suspect wiring or component fault. If input is a switch-type component, turn switch on manually. While observing PID/DVOM value, lightly spray water on suspect component, circuit and connector. Include any relays or relay modules associated with fault. If a fault is indicated, value will suddenly change. For correct values, see KOEO values in pin voltage/PID value chart in appropriate PIN VOLTAGE/PID VALUE CHARTS article in ENGINE PERFORMANCE. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.

  15. KOER Intermittent Water Soak Test

    Start engine and allow to idle. Continue to monitor PIDs and/or circuits as in step 14)  . Locate area of suspect wiring or component fault. If input is a switch-type component, turn switch on manually. While observing PID value, lightly spray water on suspect component, circuit and connector. Include any relays or relay modules associated with fault. If a fault is indicated value will suddenly change. For correct values, see HOT IDLE values in pin voltage/PID value chart in appropriate PIN VOLTAGE/PID VALUE CHARTS article in ENGINE PERFORMANCE. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.
    16. NOTE: PIDs selected from INTERMITTENT TEST table will display commanded values only. Circuit measurements made with DVOM will indicate actual values.
    NOTE: Output test mode defaults to its normal state after 10 minutes.

  16. KOEO Intermittent Output Test
    Using circuits chosen from INTERMITTENT TEST  table, select only recommended PIDs to monitor with NGS tester. Use a DVOM to compare circuit values with NGS tester PID values. If a PID is not available for a circuit, use a DVOM to monitor circuit. Turn ignition switch to ON position. Using NGS tester, access output test mode. Turn all outputs on. Locate area of suspect wiring or component fault. While observing PID value, wiggle and pull on component wiring and connector. Lightly tap on component. If a fault is indicated, value will suddenly change. Compare actual values with KOEO values in pin voltage/PID value chart in appropriate PIN VOLTAGE/PID VALUE CHARTS article in ENGINE PERFORMANCE. If no fault is indicated, exit output test mode and go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.

  17. KOER Intermittent Output Test

    Start engine and allow it to idle. Continue to monitor PIDs and/or circuits as in step 16)  . Locate area of suspect wiring or component fault. While observing PID value, wiggle and pull on component wiring and connector. Lightly tap on component. If a fault is indicated, value will suddenly change. Compare actual values with HOT IDLE values in pin voltage/PID value chart in appropriate PIN VOLTAGE/PID VALUE CHARTS article in ENGINE PERFORMANCE. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.
    NOTE: For coil on plug applications, if a coil has been tapped and is suspect, turn ignition switch to OFF position. Remove coil. Connect DVOM between spark plug terminal and signal terminal of coil. Observe DVOM and tap on coil. A large fluctuation in resistance indicates an intermittent open in coil. Replace coil as necessary.
    18. NOTE: Output test mode may not control some outputs, such as fuel injectors. To test outputs not controlled by output test mode, go to step  19.

  18. KOEO Output Intermittent Water Soak Test
    Turn ignition switch to ON position. Using NGS tester, access output test mode. Turn all outputs on. Continue to monitor PIDs and/or circuits as in step 17)  . Locate area of suspect wiring or component fault. While observing PID/DVOM value, lightly spray water on suspect component, circuit and connector. Include any relays or relay modules associated with fault. If a fault is indicated, value will suddenly change. Compare actual values with KOEO values in pin voltage/PID value chart in appropriate PIN VOLTAGE/PID VALUE CHARTS article in ENGINE PERFORMANCE. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.

  19. KOER Output Intermittent Water Soak Test

    Start engine and allow it to idle. Continue to monitor PIDs and/or circuits as in step 18)  . Locate area of suspect wiring or component fault. While observing PID value, lightly spray water on suspect component, circuit and connector. Include any relays or relay modules associated with fault. If a fault is indicated value will suddenly change. For correct values, see HOT IDLE values in pin voltage/PID value chart in appropriate PIN VOLTAGE/PID VALUE CHARTS article in ENGINE PERFORMANCE. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.

  20. Check For Intermittent Mechanical Concerns

    If not done previously, perform an inspection of mechanical systems relating to DTC or symptom. Check the following:
    • Check if engine rocks during acceleration. If excessive movement is detected, check motor mounts.
    • Check for excessive component movement while driving vehicle during conditions that would cause vibrations (high RPM, rough roads, etc.).
    • Check accelerator and transmission linkages for contact or interference.

    If any problems are detected, repair as necessary. If no problems are detected, fault cannot be identified at this time. Testing is complete.

    21. NOTE: This step is for vehicles equipped with coil pack ignition system. Testing must be performed using Rotunda Distributorless Ignition System (DIS) Tester (007-00075). If tester is not available, go to step  2 and continue testing.

  21. Intermittent Ignition Test Procedure
    Ensure all accessories are off and battery is fully charged. Check for DTCs. See QUICK TEST  under DIAGNOSIS & TESTING. If any DTCs are present, service DTCs as necessary before continuing with this test. If no DTCs are present, connect Rotunda Distributorless Ignition System (DIS) Tester (007-00075) and go to next step.

  22. Perform Self-Test

    Turn ignition switch to OFF position. Ensure all accessories are off. Install correct overlay on front of tester panel. Install appropriate program cartridge in slot. Connect proper harness adapter to DIS Tester 104-Pin PCM Adapter (007-00110). Set rotary knob to position "1". Ensure WIGGLE TEST switch is off. On all models, disconnect PCM 104-pin connector. Connect tester to PCM wiring harness connector. Turn ignition switch to ON position. Press RESET button on tester. Tester will perform a self-test and all test LEDs will light and a beep will be heard. If CASE GND fault memory LED stays on, connect a jumper wire between PCM case to ground and continue with test. If tester performs self-test and VPWR LED turns on, go to step  27. If tester does not perform self-test or VPWR LED does not turn on, go to next step.

  23. DIST Tester Check

    Turn ignition switch to OFF position. Disconnect DIS tester. Connect jumper wire between VPWR terminal at tester and positive battery terminal. Connect another jumper wire between PWR GND terminal at tester and negative battery terminal. If tester performs self-test, go to step  27. If tester does not perform self-test, tester is not functioning properly. Replace tester and retest.

  24. Check For Open VPWR Circuit

    Turn ignition switch to ON position. Measure voltage between VPWR terminal at DIS tester and negative battery terminal. If voltage is more than 6 volts, go to next step. If voltage is 6 volts or less, repair open in VPWR circuit to PCM.

  25. Check PWR GND Circuit

    Turn ignition switch to OFF position. Measure resistance between PWR GND terminal at tester and negative battery terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in PWR GND circuit to PCM. Go to step  22.

  26. Wiggle Check

    Connect a jumper wire between PWR GND terminal at tester and negative battery terminal. Turn ignition switch to ON position. Set WIGGLE TEST switch on. Set MODE switch to "B" position. Wiggle and bend wiring harness and connectors. If tester resets, repair open in VPWR circuit to PCM. Go to step  22. If tester does not reset, repair open in PWR GND circuit to PCM. Go to step  22.

  27. Check For Coil Faults

    Turn ignition switch to ON position. Press DIS tester RESET button and wait for tester to initialize. If COIL FAULT MEMORY LEDs are off, go to next step. If any COIL FAULT MEMORY LED is on or flashing, go to step  35.

  28. Check CASE GND/CKP SHIELD

    Leave ignition switch in ON position. If CASE GND/CKP SHIELD FAULT MEMORY LED is off, go to next step. If CASE GND/CKP SHIELD FAULT MEMORY LED is on or flashing, go to step  59.

  29. Check CKP BIAS

    Leave ignition switch in ON position. If CKP BIAS SYSTEM STATUS LED is on, go to next step. If CKP BIAS SYSTEM STATUS LED is off, go to step  49.

  30. Check For Coil Fault

    With DIS tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If COIL FAULT MEMORY LEDs are off with engine running or during engine cranking, go to next step. If any COIL FAULT MEMORY LED is on, go to step  35.

  31. CASE GND/CKP SHIELD Fault

    With DIS tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If CASE GND/CKP SHIELD FAULT MEMORY LED is off with engine running or during engine cranking, go to next step. If CASE GND/CKP SHIELD FAULT MEMORY LED is on, go to step  59.

  32. Check CKP Status

    With DIS tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If CKP SYSTEM STATUS SIGNAL LED is off with engine running or during engine cranking, go to next step. If CKP SYSTEM STATUS SIGNAL LED is on, go to step  53.

  33. Check For CTO Fault

    With DIS tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If CTO FAULT MEMORY LED is off with engine running or during engine cranking, go to next step. If CTO FAULT MEMORY LED is on, go to step  45.

  34. Check For CKP Signal

    With DIS tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If CKP SIGNAL SYSTEM STATUS LED is on with engine running or during engine cranking, no fault is indicated at this time. Ignition system is okay and testing is complete. If CKP SIGNAL SYSTEM STATUS LED is off, go to step  53.

  35. Check For Open IGN START/RUN Circuit

    Turn ignition switch to OFF position. Disconnect ignition coil pack(s). Turn ignition switch to ON position. Measure voltage between IGN START/RUN terminal at ignition coil pack wiring harness connector and PWR GND terminal at DIS tester. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in IGN START/RUN circuit to coil pack(s).

  36. Check For Short

    Turn ignition switch to OFF position. Measure resistance between PWR GND terminal and each COIL terminal at DIS tester. Measure resistance between VPWR terminal and each COIL terminal at DIS tester. If all resistance readings are 6 k/ohms or more, go to next step. If any resistance reading is less than 6 k/ohms, go to step  42.

  37. Check COIL Circuit Resistance

    Turn ignition switch to OFF position. Measure resistance between each COIL terminal at DIS tester and same terminal at ignition coil wiring harness connector. If each resistance reading is less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open in appropriate COIL circuit. Retest system.

  38. Check COIL Circuit For Short Together

    Measure resistance between each COIL terminal and all other COIL jacks at DIS tester. If all resistance readings are 10 k/ohms or more, go to next step. If any resistance reading is less than 10 k/ohms, go to step  43.

  39. Check For Hard Faults

    Reconnect coil pack(s). Turn ignition switch to ON position. Press DIS tester RESET button. Wait for initialization and coil test to run. If COIL FAULT MEMORY LEDs are off, go to next step. If any COIL FAULT MEMORY LED is on or flashing, go to step  44.

  40. Wiggle Test Mode B

    Set DIS tester WIGGLE TEST switch on. Set MODE switch to "B" position. Press RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If FAULT MEMORY LEDs are off, go to next step. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary. Retest system.

  41. Wiggle Test Mode B With Coil Disconnected

    Turn ignition switch to OFF position. Disconnect coil pack(s). Turn ignition switch to ON position. Press DIS tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If FAULT MEMORY LEDs are off, replace PCM. Retest system. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary. Retest system.

  42. Circuit Check

    Turn ignition switch to OFF position. Disconnect PCM. Reconnect DIS tester to vehicle wiring harness. Measure resistance between each COIL terminal and PWR GND terminal at DIS tester. Measure resistance between COIL terminal and VPWR terminal at DIS tester. If all resistance readings are 10 k/ohms or more, replace PCM. Retest system. If any resistance reading is less than 10 k/ohms, repair open in COIL circuit.

  43. Check For Short Between Coils

    Ensure ignition is in OFF position. Disconnect PCM. Reconnect DIS tester between coils wiring harness. Measure resistance between each COIL terminal and all other COIL jacks at DIS tester. If all resistance readings are 10 k/ohms or more, replace PCM. Retest system. If any resistance reading is less than 10 k/ohms, repair short between COIL circuits.

  44. System Visual Check

    Ensure ignition is turned to OFF position. Check ignition system connectors for loose, damaged or corroded terminals. Repair as necessary. Retest system. If connectors are okay, replace ignition coil pack(s).

  45. Circuit Check

    Measure resistance between CTO terminal and PWR GND terminal at DIS tester. Measure resistance between CTO terminal and VPWR terminal at DIS tester. If any resistance reading is less than one k/ohms, go to next step. If both resistance reading are one k/ohm or more, go to step  47.

  46. Isolate CTO Short

    Leave ignition switch turned to OFF position. Disconnect PCM. Reconnect DIS tester to vehicle wiring harness. Measure resistance between CTO terminal and PWR GND terminal at DIS tester. Measure resistance between CTO terminal and VPWR terminal at DIS tester. If both resistance readings are one k/ohms or more, replace PCM. Retest system. If any resistance reading is less than one k/ohms, repair fault in CTO circuit.

  47. Wiggle Test Mode B

    Turn ignition switch to ON position. Set DIS tester WIGGLE TEST switch on. Set MODE switch to "B" position. Press DIS tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If all FAULT MEMORY LEDs are off, go to next step. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary. Retest system.

  48. Wiggle Test

    On 6-cylinder models, set DIS tester MODE switch to "A" position. On 8-cylinder models, set MODE switch to "C" position. On all models, press DIS tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If all FAULT MEMORY LEDs are off, replace PCM. Retest system. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary. Retest system.

  49. Check CKP BIAS

    Turn ignition switch to OFF position. Disconnect CKP sensor connector. Turn ignition switch to ON position. Press DIS tester RESET button and wait 5 seconds for initialization. If CKP BIAS SYSTEM STATUS LED is off, go to next step. If CKP BIAS SYSTEM STATUS LED is on, go to step  51.

  50. Isolate Short Circuit

    Ensure ignition is in OFF position. Disconnect PCM 104-pin connector. Reconnect tester to vehicle wiring harness. Measure resistance between CKP+ terminal and PWR GND terminal at DIS tester. Measure resistance between CKP+ terminal and VPWR terminal at DIS tester. If both resistance readings are more than 10 k/ohms, replace PCM. Retest system. If any resistance reading is 10 k/ohms or less, repair fault in CKP+ circuit.

  51. Circuit Check

    Measure resistance between CKP- terminal and PWR GND terminal at DIS tester. Measure resistance between CKP- terminal and VPWR terminal at DIS tester. If any resistance reading is 10 k/ohms or less, go to next step. If both resistance readings are more than 10 k/ohms, replace CKP sensor. Retest system.

  52. Isolate Short Circuit

    Ensure ignition is in OFF position. Disconnect PCM 104-pin connector. Reconnect DIS tester to vehicle wiring harness. Measure resistance between CKP- terminal and PWR GND terminal at DIS tester. Measure resistance between CKP- terminal and VPWR terminal at DIS tester. If both resistance readings are more than 10 k/ohms, replace PCM. Retest system. If any resistance reading is 10 k/ohms or less, repair fault in CKP- circuit.

  53. Check CKP Signal

    Press DIS tester RESET button and wait 5 seconds for initialization. Crank or start engine. If CKP SIGNAL SYSTEM STATUS LED is off with engine running or during engine cranking, go to next step. If CKP SIGNAL SYSTEM STATUS LED is on, go to step  58.

  54. Circuit Check

    Turn ignition switch to OFF position. Disconnect CKP sensor connector. Measure resistance between CKP+ terminal at CKP sensor wiring harness connector and CKP+ terminal at DIS tester. Measure resistance between CKP- terminal at CKP sensor wiring harness connector and CKP- terminal at DIS tester. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair CKP circuit. Retest system.

  55. Check For CKP+ Short

    Leave ignition switch in OFF position. Measure resistance between CKP+ terminal and jacks for CKP-, PWR GND and VPWR at DIS tester. If any resistance reading is 10 k/ohms or less, go to next step. If all resistance readings are more than 10 k/ohms, go to step  57.

  56. Isolate Short Circuit

    Ensure ignition switch is turned to OFF position. Disconnect PCM 104-pin connector. Reconnect DIS tester to vehicle wiring harness. Measure resistance between CKP+ terminal and jacks for CKP-, PWR GND and VPWR at DIS tester. If any resistance reading is 10 k/ohms or less, repair CKP+ circuit. Retest system. If all resistance readings are more than 10 k/ohms, replace PCM. Retest system.

  57. CKP Sensor Check

    Turn ignition switch to OFF position. Inspect CKP sensor and pulse wheel for damage and correct alignment. Service CKP sensor and pulse wheel as necessary. If no problems are found, replace CKP sensor. Retest system.

  58. Wiggle Test Mode B: CKP Circuit

    Turn ignition switch to ON position. Set DIS tester WIGGLE TEST switch on. Set MODE switch to "B" position. Press DIS tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If FAULT MEMORY LEDs are off, go to next step. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary. Retest system.

  59. Check CKP SHD For Short To Power

    Turn ignition switch to OFF position. Measure resistance between CASE GND/CKP SHD terminal and VPWR terminal at DIS tester. If resistance is 10 k/ohms or less, go to next step. If resistance is more than 10 k/ohms, go to step  61.

  60. Isolate Short

    Ensure ignition switch is in OFF position. Disconnect PCM 104-pin connector. Reconnect DIS tester to vehicle wiring harness. Measure resistance between CASE GND/CKP SHD terminal and VPWR terminal at DIS tester. If resistance is 10 k/ohms or less, repair CASE GND/CKP SHD circuit. Retest system. If resistance is more than 10 k/ohms, replace PCM. Retest system.

  61. Wiggle Test Mode B: CKP Circuit

    Turn ignition switch to ON position. Set DIS tester WIGGLE TEST switch on. Set MODE switch to "B" position. Press DIS tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If FAULT MEMORY LEDs are off, repair CASE GND/CKP SHD circuit. Retest system. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary. Retest system.
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