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Trouble Code Definitions

FAULT CODE IDENTIFICATION

Code Circuit Affected Probable Cause
12 No RPM Signal No Signal For 2 Seconds
13 No RPM Signal No Signal For 2 Seconds
14 Ignition Signal No Signal
21 Oxygen Sensor Open/Short Circuit
22 Coolant Temp. Sensor Open/Short Circuit
24 Intake Air Temp. Sensor Open/Short Circuit
25 Oxygen Sensor Lean Exhaust Indicated
26 Oxygen Sensor Rich Exhaust Indicated
27 (1)(2) Sub-O2 Sensor Open/Short Circuit
31 (2) Mass Airflow Sensor Short Circuit
31 (3) MAP Sensor Open/Short Circuit
41 (2) Throttle Position Sensor Open/Short Circuit
41 (3) Throttle Position Switch Incorrect Signal Voltage
42 Vehicle Speed Sensor Incorrect Signal Voltage
43 No Crank Signal No Signal From Starter
51 Switch Condition Signal No Signal Present
52 (2) Knock Sensor Signal Open/Short Circuit
53 (2) Knock Control Signal Faulty ECM
71 (1) EGR Temp. Sensor Out Of Calibration
(1) California models only.
(2) Prizm GSi (VIN 5) only.
(3) Prizm (VIN 6) only.