On-Board Diagnostics: Notes

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Before entering on-board diagnostics, check charging system for other problems. See INITIAL CHECKS under TROUBLE SHOOTING. DO NOT connect DRB to vehicle if battery charger is connected, as DRB damage will result.

NOTE: PCM cannot diagnose every charging system problem. If fault still exists after performing self-diagnostic procedures, proceed to TESTNG - ON-VEHICLE.

Faults may be retrieved using Malfunction Indicator Light (MIL) on instrument panel or DRB. See MIL DIAGNOSTIC MODE and DRB DIAGNOSTIC MODE procedures. DRB provides a more complete diagnosis. Following is a brief description of fault codes and conditions:

Code 12 Battery feed to PCM has been interrupted within last 50-100 engine starts. PCM monitors this circuit whenever ignition is on.
Code 41 Generator field control fails to switch properly. PCM monitors this circuit whenever ignition is on.
Code 44 Battery temperature sensor voltage is out of range. PCM monitors this circuit whenever ignition is on.
Code 46 Charging system voltage is more than one volt above desired control voltage for more than 20 seconds. PCM monitors this signal whenever engine is running.
Code 47 Charging system voltage is at least one volt less than desired control voltage for more than 20 seconds. No significant change in voltage is detected during active test of generator. PCM monitors this signal whenever engine speed is more than 1500 RPM.

NOTE: MIL cannot be used to perform actuator test mode, sensor test modes or engine running test.