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Home >> Ford >> 1992 >> Crown Victoria Base, AOD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Tests W/Codes - EEC-IV >> Circuit Tests >> Circuit Test DH - Throttle Position Sensor (TPS) >> Diagnostic Aids

Diagnostic Aids

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

Normal range of throttle angle measurement for TPS is 0-85 degrees. To pass QUICK TEST  procedure, range of throttle rotation (in degrees) must be within 3 percent of specification. See Fig 2 .

To prevent replacement of good components, be aware following non-EEC related areas may be at fault:

Fig 1: TPS Circuits & Connector Terminal ID
G90F10970
TEST PIN NO. 26 (VREF) WIRE COLOR IDENTIFICATION

Application Wire Color
Escort 1.9L & Tracer 1.9L Light Green/White
Probe 3.0L Light Green/Red
Except Escort 1.9L, Probe 3.0L & Tracer 1.9L Brown/White
TEST PIN NO. 46 (SIG RTN) WIRE COLOR IDENTIFICATION

Application Wire Color
Escort 1.9L & Tracer 1.9L Light Green/Black
Probe 3.0L Light Green/Yellow
Except Escort 1.9L, Probe 3.0L & Tracer 1.9L Gray/Red
TEST PIN NO. 47 (TP) WIRE COLOR IDENTIFICATION

Application Wire Color
Escort 1.9L & Tracer 1.9L Red/White
Probe 3.0L Light Green/Black
Except Escort 1.9L, Probe 3.0L & Tracer 1.9L Gray/White
Fig 2: TPS Specification Chart
G92G03822

1) Code 23/121: Check For Other Codes  Code 23/121 indicates TPS rotational setting may be out of self-test range. Possible causes for this fault are:

Perform KOER SELF-TEST  . Check for Code 31/327. If either of these codes are present with Code 23/121, service Code 31/327 and repeat QUICK TEST  . If these codes are not present, go to step 2).

2) Code 23/121: Check For Binding Throttle Plate  Inspect throttle body and linkage for binding. If throttle plate is binding, check for binding throttle or cruise control linkage, vacuum line or harness interference, etc. Repair as necessary, and repeat QUICK TEST  . If no mechanical problem is found, go to step 3).

3) Code 53/123: Attempt To Generate Code 63/122  Code 53/123 indicates TPS signal is greater than self-test maximum value. Possible causes for this fault are:

Turn ignition off. Disconnect TPS wiring harness connector. Inspect and repair connector pins if damaged. On 1.9L A/T and Probe 3.0L A/T, locate 4EAT module under left side of dash panel. Disconnect both 4EAT module wiring harness connectors. On all models, repeat KOEO SELF-TEST  . Ignore all other codes at this time. If Code 63/122 is not displayed, go to step 6). If Code 63/122 is displayed, go to step 4).

4) Check VREF Circuit Voltage  Turn ignition on. Measure voltage between VREF and SIG RTN terminals at TPS wiring harness connector. If reading is 4-6 volts, go to step 5) (1.9L and Probe 3.0L) or replace TPS and repeat QUICK TEST  (all other models). If reading is not 4-6 volts, reconnect sensor and go to CIRCUIT TEST C.

5) Check For Shorted 4EAT Module  Probe 3.0L A/T and 1.9L have a TP input circuit to 4EAT module. This test verifies TP circuit is not shorted inside 4EAT module. Turn ignition off. Connect TP sensor. Ensure both 4EAT module wiring harness connectors are disconnected. Repeat KOEO SELF-TEST  . If Code 53/123 is present (ignore other codes at this time), replace TPS and repeat QUICK TEST  . If Code 53/123 is not present, service transmission as necessary.

6) Check TP Circuit For Short To Power  Turn ignition off. Disconnect TPS from wiring harness. Disconnect ECA 60-pin connector. Inspect it for damaged wiring, and repair as necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving ECA disconnected. Measure resistance between test pin No. 47 and test pins No. 26 and 57. If either resistance is less than 10,000 ohms, repair short circuit in wiring harness and repeat QUICK TEST  . If both resistances are 10,000 ohms or more, replace ECA and repeat QUICK TEST.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 10). No test procedures have been omitted.

10) Code 63/122: Attempt To Generate Code 53/123 Or 23/121  Code 63/122 indicates TP signal is less than minimum self-test value. See Fig 2 . Possible causes for this fault are:

Turn ignition off, and wait 10 seconds. Disconnect TPS from harness. Install a jumper wire between VREF and TP terminals at TPS wiring harness connector. Perform KOEO SELF-TEST  . If no codes are generated, remove jumper wire and go to step 13) (1.9L A/T and Probe 3.0L A/T) or step 14) (all other models). Check for Code 53/123 or 23/121 (ignore all other codes at this time). If Codes 53/123 and 23/121 are not present, remove jumper wire and go to step 11). If either Code 53/123 or 23/121 is displayed, replace TPS and repeat QUICK TEST  .

11) Check VREF Circuit Voltage  Turn ignition on. Measure voltage between VREF and SIG RTN terminals at TPS wiring harness connector. If voltage is not 4-6 volts, reconnect all components and go to CIRCUIT TEST C. If voltage is 4-6 volts, go to step 12).

12) Check TPS Circuit Continuity  Turn ignition off. Leave TPS disconnected. Disconnect ECA 60-pin connector. Inspect wiring, and repair if necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving ECA disconnected. Measure resistance between TP terminal at TPS wiring harness connector and test pin No. 47. If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST  . If resistance is less than 5 ohms, go to step 14).

13) Check For Shorted 4EAT Module  Probe 3.0L A/T and 1.9L have a TP input circuit to 4EAT module. This test verifies TP circuit is not shorted inside 4EAT module. With ignition off, reconnect TP sensor. Locate 4EAT module under left side of dash panel. Ensure both 4EAT module wiring harness connectors are disconnected. Repeat KOEO SELF-TEST  . If Code 63/122 is present (ignore other codes at this time), disconnect TPS and go to step 14). If Code 63/122 is not present, service transmission as necessary.

14) Check TP Circuit For Shorts To Ground  Turn ignition off. Leave TPS disconnected. Ensure both 4EAT module wiring harness connectors are disconnected (if applicable). Disconnect ECA 60-pin connector. Inspect wiring, and repair as necessary. With breakout box installed and ECA disconnected, measure resistance between test pin No. 47 and test pins No. 40, 46 and 60. If any reading is less than 10,000 ohms, repair short circuit and repeat QUICK TEST  . If all readings are 10,000 ohms or more, replace ECA and repeat QUICK TEST.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 14) to step 20). No test procedures have been omitted.

20) KOER Code 73/167: Repeat Dynamic Response Test  KOER Code 73/167 indicates TPS did not exceed 25% rotation during dynamic response portion of KOER SELF-TEST  . A complete Wide Open Throttle (WOT) must be performed during dynamic response portion of test. Run KOER SELF-TEST  . Ensure WOT is performed during dynamic response portion of test. If Code 73/167 is still present, go to step 21). If code is not present, system is unable to duplicate Code 73/167 at this time. Service any other KOER codes. If no other service codes are present, testing is complete.

21) Check TPS Movement During Dynamic Response Test  Turn ignition off. Disconnect ECA 60-pin connector. Inspect wiring, and repair as necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving ECA connected. Set DVOM on 20-volt scale. Connect DVOM between test pins No. 46 and 47 at breakout box. Perform KOER SELF-TEST  and ensure a proper WOT is performed during dynamic response portion of test. If DVOM reading exceeds 3.5 volts, replace ECA and repeat QUICK TEST  . If reading does not exceed 3.5 volts, ensure TPS is correctly installed and adjusted. If TPS is correctly installed and adjusted, replace TPS. Repeat QUICK TEST.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 21) to step 90). No test procedures have been omitted.

90) Continuous Memory Code 53/123  This test monitors TPS under simulated road conditions. Enter wiggle test. See CONTINUOUS MONITOR MODE (WIGGLE TEST)  under QUICK TEST. While slowly opening throttle to WOT, observe DVOM or diagnostic tester for indication of fault. Slowly bring throttle to closed position. Lightly tap TPS and wiggle harness connector. This test checks for open or short in TPS and wiring harness. If no fault is indicated, go to step 92). If fault is indicated, go to step 91).

91) Measure TP Circuit Voltage While Exercising TPS  Turn ignition off, and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect it for damaged wiring, and repair if necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving ECA connected. Stay in wiggle test (as in previous step). Connect DVOM between test pins No. 47 and 46. Set DVOM on 20-volt scale. With ignition on and engine off, observe DVOM and repeat step 90). If fault occurs at less than 4.25 volts, inspect TPS connectors and terminals. If connectors and terminals are okay, replace TPS, clear codes and repeat QUICK TEST  . If fault does not occur at less than 4.25 volts, TPS over-travel may have caused Continuous Memory Code 53/123. TPS is okay. Go to step 92) to check wiring harness.

92) Check EEC-IV Wiring Harness  While in wiggle test, bend and shake small sections of EEC-IV harness from TPS wiring harness connector to firewall and from firewall to ECA while observing analog voltmeter or scan tester. If fault is indicated, isolate fault in wiring and repair as necessary. Clear codes, and repeat QUICK TEST  . If no fault is indicated, go to step 93).

93) Check ECA & Harness Connectors  Turn ignition off, and wait 10 seconds. Disconnect ECA 60-pin connector from breakout box. Inspect connectors and terminals for damage, and repair as necessary. Clear codes from ECA memory, and repeat QUICK TEST  . If connectors and terminals are okay, fault cannot be duplicated at this time. Continuous Memory Code 53/123 testing is complete.

94) Continuous Memory Code 63/122  This test checks for open or short in TPS, connectors and wiring harness under simulated road conditions. Enter wiggle test. See CONTINUOUS MONITOR MODE (WIGGLE TEST)  under QUICK TEST. Observe VOM or diagnostic tester for indication of fault while performing following:

If fault is indicated, disconnect TPS. Inspect connectors and terminals. If connectors and terminals are okay, replace TPS. Clear codes from ECA memory, and repeat QUICK TEST  . If no fault is indicated, go to next step.

95) Check EEC-IV Wiring Harness  Stay in wiggle test (as in previous step). Bend, wiggle and shake small sections of EEC-IV harness from TPS wiring harness connector to firewall and from firewall to ECA while observing analog voltmeter or scan tester. If fault is indicated, isolate fault in wiring and repair as necessary. Clear codes from ECA memory, and repeat QUICK TEST  . If no fault is indicated, go to step 96).

96) Check ECA & Harness Connectors  Turn ignition off, and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connectors and terminals for damage. If connectors and terminals are damaged, repair as necessary. Clear codes from ECA memory, and repeat QUICK TEST  . If connectors and terminals are okay, fault cannot be duplicated at this time. Continuous Memory Code 63/122 testing is complete.

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