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 Diagnostic Trouble Codes - 1986 PONTIAC
 

 

 Complements,
 

 

 

 

13  Open Oxygen Sensor Circuit
 14  Coolant Temperature Sensor (High Temp Indicated)
 15  Coolant Temperature Sensor (Low Temp Indicated)
 21  Throttle Position Sensor (Signal Voltage High)
 22  Throttle Position Sensor (Signal Voltage Low)
 23  Manifold Air Temperature (MAT) Low Temp Indicated
 24  Vehicle Speed Sensor (VSS) Circuit
 25  Manifold Air Temperature (MAT) High Temp Indicated
 32  Exhaust Gas Recirculation (EGR) Vacuum Control
 33  Mass Air Flow Sensor (MAF) (GM/SEC High)
 34  Mass Air Flow Sensor (MAF) (GM/SEC Low)
 42  C3-I EST or Bypass Circuit Failure
 43  Electronic Spark Control (ESC) Circuit
 44  Oxygen Sensor Circuit (Lean Exhaust Indicated)
 45  Oxygen Sensor Circuit (Rich Exhaust Indicated)
 51  PROM Error
 52  CALPAK Error
 55  ECM Error

To extract a trouble from the computer for diagnostic purposes, the Assembly Line Communication Link (ALDL) connector is used.

Ground terminals A and B with the ignition "ON" and engine not running. The system will enter the diagnostic mode. In this mode, the computer will display a 12, three consecutive times, by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" or light. A 12 consists of one flash, a short pause, then two flashes in rapid succession.

After 12 is displayed, any stored trouble s will be displayed by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" light. All s are displayed 3 times each then a 12 will repeat. In the diagnostic mode, the computer will also energize all computer controlled relays and solenoids.

 



 

 

 

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