Trouble Code Charts
TROUBLE CODE IDENTIFICATION
| Code No. | System Affected | Probable Cause | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| No Code | System Normal | System Normal | ||||||||
| 11 (1) | ECU (B+) | Ign. Switch/Circuit, ECU Main Relay/Ckt | ||||||||
| 12 & 13 | RPM Signal | Dist./Circuit, ECU, | ||||||||
| 14 | Ignition Signal | Igniter/Circuit, Ign. Coil/Ckt, ECU | ||||||||
| 21 | O2 Sensor & O2 Heater Signal | O2 Sensor/Ckt, (2) O2 Sensor Heater/Ckt, ECU | ||||||||
| 22 | Temp. Sensor/Switch Signal | Coolant Temp. Sensor/Ckt, Coolant Temp. Switch/Ckt, ECU | ||||||||
| 24 | Intake Air Temp. Sensor Signal | Intake Air Temp. Sensor/Ckt, ECU | ||||||||
| 25 | Lean Air/Fuel Mixture | Injector/Ckt, O2 Sensor/Ckt, ECU, Fuel Line Press., Air Leak, Airflow Meter, Ignition System | ||||||||
| 26 | Rich Air/Fuel Mixture | Injector/Ckt, O2 Sensor/Ckt, Fuel Line Press., Airflow Meter, (1) Vacuum Sensor, Cold Start Injector, ECU | ||||||||
| 27 (2) | Sub-O2 Sensor Signal | Sub-O2 Sensor/Circuit, ECU | ||||||||
| 31 (3) | Airflow Meter/Vac. Sensor Signal | Airflow Meter/Ckt, ECU, Vacuum Sensor/Circuit, Vacuum Switch/Circuit | ||||||||
| 42 | Vehicle Speed Sensor Signal | Vehicle Speed Sensor/Ckt, ECU | ||||||||
| 43 | Starter Signal | Ignition Switch/Ckt, ECU, Starter Signal Ckt | ||||||||
| 51 | Switch Signal | A/C Switch/Ckt, A/C Amplifier, Throttle Position Sensor/Ckt, ECU | ||||||||
| 71 (4) | EGR System Malfunction | EGR System (valve, hoses, temp. sensors, vacuum switching valves), ECU | ||||||||
| 72 | Fuel Cut Solenoid Signal | Fuel Cut Solenoid/Ckt, ECU | ||||||||
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TROUBLE CODE DIAGNOSTIC HINTS (FUEL INJECTED VEHICLES)
| Trouble Code | Diagnostic Hints | ||
|---|---|---|---|
| 11 | Momentary Interruption Of Power Supply To ECU Could Also Indicate Loss Of ECU E1 Ground Connection | ||
| 12 | No "Ne" (RPM) Ignition Signal To ECU Within 2 Seconds After Engine Is Cranked No "G" Ignition Signal To ECU 2 Times In A Row When Engine Speed Is Between 500-4000 RPM | ||
| 13 | No "Ne" (RPM) Ignition Signal To ECU When Engine Speed Is Above 1500 RPM Signal Is Generated By Pick-Up Coils In Distributor | ||
| 14 | No "IGF" Ignition Signal To ECU From Ignitor Several Times In Succession | ||
| 21 | (1) Detects Deterioration Of Oxygen Sensor Open Or Short In Oxygen Sensor Circuit | ||
| 22 | Open Or Short In Coolant Temp. Sensor/Switch Signal | ||
| 24 | Open Or Short Circuit In Intake Air Temp. Sensor Signal | ||
| 25 | Open Circuit In O2 Sensor Signal Signal Sent By O2 Sensor For Several Seconds During Air/Fuel Ratio Feedback Correction | ||
| 26 | Rich Signal Sent By O2 Sensor For Several Seconds During Air/Fuel Ratio Feedback Correction | ||
| 27 | Open Or Short In Sub-O2 Sensor Signal | ||
| 31 (4A-FE Only) | Open Or Short In Vacuum Sensor/Switch Signal | ||
| 31 & 32 | Short Circuit Between Terminals Of Airflow Meter | ||
| 34 | Turbocharger Pressure Is Abnormal Code May Also Set If Airflow Meter Is Faulty | ||
| 35 | Open Circuit In High Altitude Compensator Signal | ||
| 41 | Open Or Short In Throttle Position Sensor Signal "IDL" & "PSW" Signals Are Output At Same Time For Several Seconds | ||
| 42 | No "SPD" Signal From Vehicle Speed Sensor For 8 Seconds With Engine Speed Between 2300-5500 RPM & Coolant Temp. Is Below 176°F (80°C) Except When Racing The Engine | ||
| 43 | No "STA" Signal To ECU Until Engine Reaches 800 RPM With Vehicle Not Moving | ||
| 51 | Problem In One Of 3 Switches ECU Monitors, Throttle Position Sensor ("IDL" Signal) Neutral Safety Switch ("NSW" Signal On A/T) A/C Signal To ECU Occurs When TPS Is At Idle & A/C Switch Is "ON" And Check Connector "E1" And "TE1" Is Jumpered | ||
| 52 | Open Or Short Circuit In Knock Sensor Signal | ||
| 53 | Knock Control In ECU Is Faulty | ||
| 71 | EGR Valve Normally Closed, Or Clogged Hose Open Circuit In EGR Temperature Sensor Signal EGR Gas Below Predetermined Level During EGR Control | ||
| 72 | Open Circuit In Fuel-Cut Solenoid Signal | ||
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