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 Diagnostic Trouble Codes - 1985 Chevrolet
 

 

 Complements,
 

 

 

 

12  No Reference Pulse
 13  Oxygen Sensor Circuit
 14  Coolant Sensor Shorted
 15  Coolant Sensor Circuit Open
 21  Throttle Position Sensor (TPS) Signal Voltage High
 23  Mixture Control (M/C) Solenoid Voltage Low
 24  Vehicle Speed Sensor (VSS) Circuit
 32  BARO Sensor Voltage Low
 34  Differential Pressure (VAC) Sensor - Voltage Incorrect
 41  No Distributor Reference Signal
 42  Electronic Spark Timing (EST) or Bypass Fault
 44  Lean Exhaust Indication
 45  Oxygen Sensor Circuit (Rich Exhaust Indicated)
 51  PROM Error
 53  Exhaust Gas Recirculation (EGR) Control Error
 54  Mixture Control Solenoid (M/C) Voltage High

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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