H - Auxiliary Powertrain Control System

Note
Enter this pinpoint test for PCM diagnostics.

Remember
This pinpoint test is intended to diagnose only the following:
- harness circuits KEY PWR, GND, BUS+, BUS- and hi-mount stoplight circuit 569 (DG) for F-Series or 511 (LG) for Econoline
- APCM F-Series F5TF-12B641, Econoline F5UF-12B641







Description
The auxiliary powertrain control system provides an operator interface to the drive-by-wire powertrain control system to effect Charge Protection, RPM Control, and manual throttle control between 1300 and 2500 rpm.

NOTE: Functions may not be available if the operator has deprogrammed them.

Enabling conditions: Parking brake set, automatic transmission in park, manual transmission in neutral, foot off clutch pedal, service brake and accelerator pedal, and brake lights connected and functional. To operate system with hazard flashers, the hi-mount stoplight circuit must be complete and operational. If necessary refer to Pinpoint Test FD. FD - Brake Lamp Switch

The following error codes are displayed from the APCM only:
- CErr indicates that one or both BUS circuits are open or shorted.
- CrSd indicates a fault on BUS circuits or internal APCM fault.
- EErr and AErr both indicate an internal APCM fault.

Follow the direction given below to aid in diagnosing the APCM fault condition:
- If APCM does not work at all, go to Pinpoint Test Step H1.
- If APCM does not work with hazard flashers for all vehicles except Econoline Cutaway, go to Pinpoint Test Step H7.
- It APCM does not work with hazard flashers on Econoline Cutaway only, go to Pinpoint Test Step H11.
- If APCM error code CErr or CrSd are displayed, go to Pinpoint Test Step H5.
- If APCM error code EErr or AErr are displayed, replace APCM.

H1 - H4:

H5 - H13: