Engine Control System

Part 1 Of 3:

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Part 3 Of 3:

INSPECTION CHART FOR DIAGNOSTIC TROUBLE CODES (FAULT TREE)

NOTE
1. Do not replace the engine control module (ECM) until a thorough terminal check reveals there are no short/open circuits.
2. After the ECM detects a malfunction, a diagnostic trouble code is recorded when the engine is next started and the same malfunction is re-detected. However, for items marked with a "*", the diagnostic trouble code is recorded on the first detection of the malfunction.
3. O2 : Heated oxygen sensor
4. Sensor 1: indicates sensors which are mounted closest to the engine.
5. Sensor 2: indicates sensors which are mounted next-closest to the engine.