System Diagnosis

The throttle body fuel injection system is equipped with "On-Board Diagnosis," which has a self-diagnostic capability that checks several circuits. If abnormal signals occur often enough to indicate a valid problem, the SMEC will store the fault code for later display. If problem is either repaired or disappears by itself, the SMEC will remove the fault code after 50-100 engine starts.

Depending on fault code, the "Check Engine" light may illuminate. Located on instrument panel, this light informs operator that malfunction in system has occurred and immediate service is required.

The SMEC will attempt to compensate for failure of a component by using input from remaining sensors. If the check engine light comes on or certain driveability and engine performance problems exist, the source of these difficulties may be determined by displaying and recording fault codes. Check FAULT CODES to determine questionable circuits.