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Home >> Ford >> 1995 >> Probe Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes - EEC-IV (2.0L) >> Circuit Tests >> Circuit Test Dd - EGR Position (EGRP) Sensor, EGR Vacuum (EGRV) Solenoid & EGR Atmospheric (EGRA) Solenoid >> Diagnostic Aids

Diagnostic Aids

Perform this test only when directed by QUICK TEST. This circuit test is intended to diagnose the following components and circuits:

Fig 1: Identifying EGRP Sensor Connector Terminals
G94H31945
Fig 2: Identifying EGRV & EGRA Solenoid Connector Terminals
G94I31946

1) Code 327: Attempt To Generate Code 337  Code 327 indicates EGR Position (EGRP) sensor signal is less than self-test minimum. Possible causes for this fault are:

Turn ignition off. Disconnect EGRP sensor connector. Connect jumper wire between terminals VREF and EGRP of EGRP sensor wiring harness connector. Repeat KOEO and KOER SELF-TEST. If Code 337 is displayed, replace EGRP sensor/EGR valve assembly. Remove jumper wire, and repeat QUICK TEST. Disregard any other codes that are set at this time. If Code 337 is not displayed, remove jumper wire, and go to next step.

2) Check EGRP VREF Voltage  Turn ignition on. Ensure EGRP sensor is disconnected. Measure voltage between VREF and SIG RTN terminals at EGRP sensor connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.

3) Check EGRP Sensor SIG RTN Circuit Continuity  Turn ignition off. Disconnect PCM 60-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between SIG RTN terminal of EGRP sensor connector and test pin No. 46 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit. Remove breakout box, reconnect all components, and repeat QUICK TEST.

4) Check For Short To Ground In EGRP SIG RTN Circuit  Measure resistance between test pin No. 27 and test pins No. 40, 46 and 60 at breakout box. If all readings are more than 10,000 ohms, replace PCM. Remove breakout box, reconnect all components, and repeat QUICK TEST. If any reading is 10,000 ohms or less, repair short to ground. Remove breakout box, reconnect all components, and repeat QUICK TEST.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 10). No test procedures have been omitted.

10) Code 337: Attempt To Generate Code 327  Code 337 indicates EGR Position (EGRP) sensor signal is more than self-test minimum. Possible causes for this fault are:

Turn ignition off. Disconnect EGRP sensor connector. Connect jumper wire between EGRP and SIG RTN terminals of EGRP sensor wiring harness connector. Repeat KOEO and KOER SELF-TEST. If Code 327 is displayed, remove jumper wire, and go to step 13). Disregard any other codes that are set at this time. If Code 327 is not displayed, remove jumper wire, and go to next step.

11) Check EGRP Circuit Continuity  Turn ignition off. Disconnect PCM 60-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair connector as necessary. Ensure EGRP sensor is disconnected. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between EGRP terminal at EGRP sensor connector and test pin No. 27 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit. Remove breakout box, reconnect all components, and repeat QUICK TEST.

12) Check For Short To Power In EGRP Circuit  Measure resistance between test pin No. 27 and test pins No. 26, 37 and 57 at breakout box. If all readings are more than 10,000 ohms, replace PCM. Remove breakout box, reconnect all components, and repeat QUICK TEST. If any reading is less than 10,000 ohms, repair short circuit. Remove breakout box, reconnect all components, and repeat QUICK TEST.

13) Check Vacuum At EGRV Solenoid Valve  Turn ignition off. Disconnect EGRV solenoid vacuum line at EGRV solenoid output port. Install vacuum gauge at output port of EGRV solenoid. Start engine and allow it to idle. Observe vacuum gauge. If vacuum is present, replace EGRV solenoid. Remove vacuum gauge. Reconnect all components and repeat QUICK TEST. If vacuum is not present, check EGR valve vacuum hose routing. Repair as necessary. If hose routing is okay, replace EGRP sensor/EGR valve assembly. Remove vacuum gauge. Reconnect all components and repeat QUICK TEST.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 20). No test procedures have been omitted.

20) Code 571 & 572: Check EGRA/EGRV Solenoid Resistance  Code 571 indicates failure in EGRA solenoid circuit. Code 572 indicates failure in EGRV solenoid circuit. Possible causes for this fault are:

Turn ignition off. Disconnect EGRA (Code 571) or EGRV (Code 572) solenoid connector. Measure resistance between solenoid connector terminals. If resistance is 30-70 ohms, go to next step. If resistance is not 30-70 ohms, replace solenoid, and repeat QUICK TEST.

21) Check Solenoid VPWR Circuit  Turn ignition on. Ensure solenoid to be tested is disconnected. Measure voltage between negative battery terminal and VPWR terminal at solenoid connector. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open circuit. Repeat QUICK TEST.

22) Check Solenoid Circuit Continuity  Turn ignition off. Ensure solenoid to be tested is disconnected. Disconnect PCM 60-pin connector. Inspect for damage, and repair if necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. If testing EGRA solenoid, measure resistance between test pin No. 12 at breakout box and EGRA terminal at solenoid connector. If testing EGRV solenoid, measure resistance between test pin No. 33 at breakout box and EGRV terminal at solenoid connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit. Remove breakout box, reconnect all components, and repeat QUICK TEST.

23) Check For Solenoid Circuit Short  If testing EGRA solenoid, measure resistance between test pin No. 12 and test pins No. 37, 40, 57 and 60 at breakout box. If testing EGRV solenoid, measure resistance between test pin No. 33 and test pins No. 37, 40, 57 and 60 at breakout box. If all readings are more than 10,000 ohms, replace PCM. Remove breakout box, reconnect all components, and repeat QUICK TEST. If any reading is 10,000 ohms or less, repair short circuit. Remove breakout box, reconnect all components, and repeat QUICK TEST.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 23) to step 30). No test procedures have been omitted.

30) Code 332: Check Vacuum To EGR Valve  Code 332 indicates EGRP sensor input did not change after PCM commanded EGR valve to open. Possible causes for this fault are:

Turn ignition off. Disconnect EGR vacuum hose at EGR valve, and connect vacuum gauge to disconnected vacuum hose. Repeat KOEO SELF-TEST, while observing vacuum gauge. If vacuum is less than 1.0 in. Hg throughout KOEO SELF-TEST, go to next step. If vacuum is 1.0 in. Hg or more throughout KOEO SELF-TEST, replace EGRP sensor/EGR valve. Reconnect all components and repeat QUICK TEST.

31) Check EGR Vacuum Hose  Ensure EGR valve vacuum hose is disconnected. Insect vacuum hose between EGR valve and EGRV/EGRA solenoids. Replace hose as necessary. Repeat QUICK TEST. If vacuum hose is okay, reconnect vacuum hose, and go to next step.

32) Check Vacuum To EGRV Solenoid  Turn ignition off. Disconnect vacuum hose from EGRV solenoid input port. Install vacuum gauge to disconnected hose. Start engine and allow it to idle. If vacuum is more than 10 in. Hg, remove vacuum gauge. Reconnect vacuum hose, and go to next step. If vacuum is 10 in. Hg or less, check vacuum hose to EGRV solenoid. Replace hose as necessary. If vacuum hose is okay, check vacuum source for solenoid. Repair as necessary. Repeat QUICK TEST.

33) Check EGRV Solenoid Valve  Turn ignition off. Disconnect vacuum hose from EGRV solenoid output port. Install vacuum gauge to output port of EGRV solenoid. Repeat KOEO SELF-TEST and observe vacuum gauge. If vacuum signal decreases then increases, remove vacuum gauge, and go to next step. If vacuum signal does not decrease then increase, replace EGRV solenoid. Remove vacuum gauge. Reconnect all components and repeat QUICK TEST.

34) Check EGRV Solenoid Output Port Vacuum Hose  Disconnect vacuum hose from EGRV solenoid output port. Inspect vacuum hose for obstructions, cracks and kinks. Replace vacuum hose as necessary, and repeat QUICK TEST. If vacuum hose is okay, reconnect vacuum hose and go to next step.

35) Check EGRA Solenoid Vacuum Hose  Disconnect EGRA vacuum hose. Inspect vacuum hose for obstructions, cracks and kinks. Replace vacuum hose as necessary, and repeat QUICK TEST. If vacuum hose is okay, replace EGRA solenoid. Reconnect vacuum hose, and repeat QUICK TEST.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 35) to step 90). No test procedures have been omitted.

90) Continuous Memory Code 327 Or 337: Check for Intermittent  Continuous Memory Code 327 indicates EGRP sensor input to PCM was below minimum acceptable voltage sometime during vehicle operation. Continuous Memory Code 337 indicates EGRP sensor input to PCM was more than the maximum acceptable voltage sometime during vehicle operation. Possible causes for this fault are:

Enter CONTINUOUS MONITOR MODE (WIGGLE TEST). Observe test equipment and perform the following:

If a fault is indicated, inspect EGRP sensor connector and terminals. Repair as necessary. If connector and terminals are okay, replace EGRP sensor/EGR valve assembly. Clear codes, and repeat QUICK TEST. If a fault is not indicated, go to next step.

91) Check For Intermittent Harness Damage: Check For Intermittent Sensor Damage  While still in CONTINUOUS MONITOR MODE (WIGGLE TEST), observe test equipment and perform the following. Shake and bend small sections of wiring harness starting at EGRP sensor and working toward dash panel. Also, shake and bend small sections of wiring harness starting at dash panel and working toward PCM. If a fault is indicated, isolate fault and repair as necessary. Clear codes and repeat QUICK TEST. If a fault is not indicated, go to next step.

92) Check PCM Connector  Turn ignition off. Disconnect PCM connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Clear codes and repeat QUICK TEST. If connector and wiring are okay, fault cannot be duplicated at this time. Testing is complete.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 92) to step 100). No test procedures have been omitted.

100) Continuous Memory Code 332: Check EGR Valve Function  Continuous Memory Code 332 indicates EGR valve did not open when engine load and requested conditions had been met sometime during vehicle operation. Possible causes for this fault are:

Turn ignition off. Disconnect and plug EGR valve vacuum line at EGR valve. Connect vacuum pump to EGR valve. Apply 10 in. Hg to EGR valve. Observe EGR valve and release vacuum. If EGR valve functions properly, remove vacuum pump. Unplug vacuum hose, and go to next step. If EGR valve does not function properly, remove EGRP sensor/EGR valve assembly. Inspect EGR valve for blockage, binding, contamination and leakage. Repair or replace EGR valve assembly as necessary. Clear codes and repeat QUICK TEST.

101) Check EGR Valve Vacuum Hose  Disconnect EGR vacuum hose at vacuum source and EGR valve. Inspect vacuum hose for obstructions, cracks and kinks. Replace vacuum hose as necessary. Clear codes and repeat QUICK TEST. If vacuum hose is okay, reconnect vacuum hose and go to next step.

102) Check EGRA & EGRV Solenoid Vacuum Hoses  Disconnect solenoid vacuum hose to be checked. Inspect vacuum hose for obstructions, cracks and kinks. Replace vacuum hose as necessary. Clear codes and repeat QUICK TEST. If vacuum hose is okay, reconnect vacuum hoses and go to next step.

103) Check EGRV/EGRA Solenoids & Circuits For Intermittent Fault  Turn ignition off. Disconnect vacuum hose at EGR valve and connect vacuum pump to disconnected hose. Start engine and allow it to idle. Observe vacuum pump for increased vacuum while performing the following:

If vacuum reading increased, isolate fault and repair as necessary. Clear codes and repeat QUICK TEST. If vacuum reading did not increase, fault cannot be duplicated at this time. Testing is complete.

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