Engine Control System

P0100 - P0173:

P0201 - P0446:

P0450 - P0791:

DIAGNOSTIC CHART (FAULT TREE)

NOTE:
1. Do not replace the engine control module (ECM) until a through 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.