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Trouble Code Identification

TROUBLE CODE IDENTIFICATION

Code No. Circuit Affected
No Code System Normal
11 ECU (B+)
12 & 13 RPM Signal
14 Ignition Signal
21 O2 Sensor or O2 Heater Signal
22 Coolant Temp. Sensor Signal
24 Intake Air Temp. Sensor Signal
25 Lean Air/Fuel Mixture
26 Rich Air/Fuel Mixture
28 No. 2 O2 Sensor or No. 2 O2 Heater Signal
31 Airflow Meter Signal
32 Airflow Meter Signal
35 HAC Sensor Signal
41 Throttle Position Sensor Signal
42 Vehicle Speed Sensor Signal
43 Starter Signal
51 Switch Signal
71 (1) EGR System Malfunction
(1) Applicable to all California models.
TROUBLE CODES & PROBABLE CAUSE

Code No. Probable Cause
11 Main Relay and/or Circuit, Ignition Switch and/or Circuit, ECU
12 Distributor and/or Circuit, Starter Signal, Ignitor, ECU
13 Distributor and/or Circuit, ECU
14 Ignition Coil, Ignitor and/or Circuit, ECU
21 O2 Sensor and/or O2 Heater Signal and/or Circuit, ECU
22 Coolant Temp. Sensor and/or Circuit, ECU
24 Intake Air Temp. Sensor or Circuit, ECU
25 Injector and/or Ckt, O2 Sensor and/or Ckt Airflow Meter, ECU, Fuel Line Pressure Air Intake System, Ignition System
26 Injector and/or Circuit, Fuel Line Pressure, Cold Start Injector, Airflow Meter, O2 Sensor and/or Circuit, ECU
28 O2 Sensor and/or O2 Heater Signal and/or Circuit, ECU
31 Airflow Meter and/or Circuit, ECU
32 Airflow Meter or Circuit, ECU
35 HAC Sensor and/or Circuit, ECU
41 Throttle Position Sensor and/or Circuit, ECU
42 Vehicle Speed Sensor and/or Circuit, ECU
43 Ignition Switch and/or Circuit Starter Signal Circuit, ECU
51 Throttle Position Sensor and/or Circuit A/C Switch Circuit, A/C Amplifier, ECU Neutral/Start Switch and/or Circuit, Accelerator Pedal and/or Cable
71 (1) EGR System, EGR Gas Temp. Sensor and/or Circuit, BVSV for EGR and/or Circuit, ECU
(1) Applicable to all California models.
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