Diagnostic Aids
Perform this test only when directed by QUICK TEST. This test is intended to diagnose the following:
- TP sensor.
- Wiring harness circuits (PWR GND, SIG RTN, TP, VPWR and VREF).
- Powertrain Control Module (PCM).
Normal range of throttle angle measurement for TP sensor is 0-85 degrees. To pass QUICK TEST procedure, range of throttle rotation (in degrees) must be within 3 percent of specification.
To prevent replacement of good components, be aware, the following non-EEC related areas may be at fault:
- Idle speed.
- Binding throttle shaft or linkage.
- TP sensor not seated.
1) Check For Other Codes DTC P1124 indicates TP sensor rotational setting may be out of self-test range. Possible causes for this fault are:
- Faulty TP sensor.
- Faulty Powertrain Control Module (PCM).
Perform KOEO and KOER self-test. Check for DTC P1400. If DTC P1400 is present, service code and repeat QUICK TEST. If DTC P1400 is not present with DTC P1124, go to next step.
2) Check For Binding Throttle Plate Inspect throttle body for binding. If throttle body is binding, check for binding throttle or cruise control linkage, vacuum line or harness interference. Repair as necessary, and repeat QUICK TEST. If no mechanical problem is found, throttle plate and linkage is okay.