System Diagnosis

Self-diagnostic capabilities of this system, if properly utilized, can simplify testing. Single Board Engine Controller II (SBEC-II) monitors several different engine control system circuits.

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

Once codes are known, refer to FAULT CODES to determine questionable circuit. Test circuits, and repair or replace components as required. If problem is repaired or ceases to exist, SBEC-II cancels fault code after 50 ignition on/off cycles. To clear codes, refer to CLEARING TROUBLE CODES  .

A specific fault code results from a particular system failure. It is NOT necessarily reason for failure. Fault code does not condemn a specific component, but calls out a probable malfunction area.