System Diagnosis: Notes

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

If a problem is sensed with a monitored circuit, a fault code is stored in SBEC, CHECK ENGINE light illuminates and SBEC enters limp-in mode. In limp-in mode, SBEC compensates for component failure by substituting information from other sources. This allows vehicle operation until repairs can be made.

Once codes are known, refer to CHARGING SYSTEM FAULT CODES  table to determine the questionable circuit. Test circuits and repair or replace components as required. If problem is repaired or ceases to exist, SBEC cancels that fault code after 50 ignition on/off cycles. To clear codes, refer to ERASING FAULT CODES under ENTERING ON-BOARD DIAGNOSTICS.

A specific fault code results from a particular system failure. Components in that system are NOT necessarily the reason for that failure. The fault code does not condemn a specific component, it calls out a CIRCUIT malfunction.