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 logic module will store appropriate fault code for later display. If problem is either repaired or disappears by itself, logic module will remove the fault code after 30 engine starts have occurred.

When fault code for coolant temperature sensor, MAP sensor, TPS, high battery voltage or loss of battery voltage is set, power loss light comes on. The power loss light, located on instrument panel, informs operator that malfunction in system has occurred and that immediate service is required.

The logic module attempts to compensate for failure of any particular component by using input from remaining sensors. This capability may allow vehicle to reach a repair facility under its own power.

If either power loss light comes on or certain driveability and engine performance problems exist, probable source of these difficulties may be determined by displaying and recording fault codes. Check FAULT CODES to determine questionable circuit.