Diagnostic Aids

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.