Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
The Powertrain Control Module (PCM) reset occurs when PCM momentarily "reboots" or is turned off and on while engine running. If condition occurs a single time, engine will momentarily stumble and PCM will go through a normal key on cycle, including turning WAIT TO START light and glow plugs on. It will also attempt to validate accelerator pedal position. If accelerator pedal is not at idle position when fault occurs, pedal authority will not be allowed by PCM until accelerator pedal is released and engine speed returns to idle. This pinpoint test is intended to diagnose following:
- Powertrain Control Module (PCM)
- Injector Driver Module (IDM)
- AP, BARO, CMP, EBP, ETC, ICP & MAP Sensors
- Under Valve Cover (UVC) Gasket, Chassis & Engine Harnesses
NOTE:
Perform this test only after TESTS 5, 6 and 7 under ENGINE PERFORMANCE DIAGNOSTIC PROCEDURES in SYSTEM & COMPONENT TESTING - 7.3L DIESEL have been performed. This will determine if PCM has detected any fault conditions that can cause a PCM reset.