Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Ford RV Cutaway, 2002 Ford Pickup, 2002 Ford F550 Super Duty, 2002 Ford F450 Super Duty, and 2002 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.

Any detected malfunction of AP sensor will illuminate MIL (Econoline) or SERVICE ENGINE SOON indicator (F650-750). An AP signal that is detected out of range (high or low) by PCM will cause engine to ignore AP signal and will only allow engine to operate at low idle. If a disagreement in state of Idle Validation Switch (IVS) and AP sensor is detected by PCM, engine will only be allowed to operate at low idle. Perform this test when directed by QUICK TEST. This test is only intended to diagnose the following components and circuits:

AP Sensor
Wiring Harness Circuits; (AP, AP GND & VREF)
Powertrain Control Module (PCM)

Fig 1: Location Of Accelerator Pedal Sensor & Idle Validation Switch (Econoline & F650-750)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying Accelerator Pedal Sensor Circuits & Connector Terminals (Econoline & F650-750)

Courtesy of FORD MOTOR CO.