System Diagnosis: Notes

WARNING: This page is about a different car, the 1994 Plymouth Sundance, 1994 Plymouth Acclaim, 1994 Dodge Spirit, 1994 Dodge Shadow, and 1994 Chrysler LeBaron. However, it is still accessible from the selected car via links, so may be relevant.

The self-diagnostic capabilities of this system, if properly used, can simplify testing. PCM monitors several different engine control system circuits.

If a problem is sensed with a monitored circuit, a trouble code is stored in PCM, Malfunction Indicator Light (MIL) illuminates and PCM enters limp-in mode. In limp-in mode, PCM compensates for component failure by substituting information from other sources. This allows vehicle operation until repairs can be made.

Once trouble codes are known, to determine the questionable circuit refer to CHARGING SYSTEM TROUBLE CODES table under ENTERING ON-BOARD DIAGNOSTICS.

Perform circuit tests to repair or replace components as required. If problem is repaired or ceases to exist, the PCM will cancel that trouble code after 50 ignition on/off cycles. To clear codes, refer to appropriate ERASING TROUBLE CODES heading under ENTERING ON-BOARD DIAGNOSTICS .

A specific trouble code results from a particular system failure. Components in that system are not necessarily the reason for that failure. The trouble code does not condemn a specific component, it indicates a circuit malfunction.