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Trouble Code Definition

TROUBLE CODE IDENTIFICATION

Code  System Affected  Probable Cause 
12 System Normal System Normal
13  Heated Oxygen Sensor Sensor Or Circuit, ECM
14  Engine Coolant Temp. (ECT) Sensor Sensor Or Circuit, ECM
15  (1) Engine Coolant Temp. (ECT) Sensor Sensor Or Circuit, ECM
21  (2) Throttle Position (TP) Sensor Sensor Or Circuit, ECM
22  (3) Throttle Position (TP) Sensor Sensor Or Circuit, ECM
23  Intake Air Temp. (IAT) Sensor Sensor Or Circuit, ECM
24  Vehicle Speed Sensor Sensor Or Circuit, ECM
25  (1) Intake Air Temp. (IAT) Sensor Sensor Or Circuit, ECM
31  (2) MAP Sensor Sensor Or Circuit, ECM
32  (3) MAP Sensor Sensor Or Circuit, ECM
41 (4) Ignition Signal Circuit Ign. Coil, Ignitor, Wiring Circuit, ECM
42 (5) Crank Angle Sensor Sensor, Wiring, ECM
44 (5) Idle Switch Circuit Open TP Sensor, Wiring, ECM
45  Idle Switch Circuit Shorted TP Sensor, Wiring, ECM
51 (6) EGR System ECM, EGR, Modulator, Wiring, EGR Temp. Sensor, Vacuum Switching Valve
53  (6) ECM Ground Circuit Wiring, ECM
(1) High temperature is indicated.
(2) High voltage is indicated.
(3) Low voltage is indicated.
(4) Code 41 is not stored in ECM memory. To check code when engine fails to start, crank engine, and then, with ignition still on, install fuse in diagnostic terminal of fuse block.
(5) When code occurs, ECM will not activate CHECK ENGINE light while engine is running. When problem is fixed, memory of defective area will automatically be erased from ECM.
(6) California emission models only.
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