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Diagnostic Trouble Codes - 1989
Chevrolet

 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) Circuit
 33  Manifold Absolute Pressure Sensor Circuit (High Sig.)
 34  Manifold Absolute Pressure Sensor Circuit (Low Sig.)
 42  Electronic Spark Timing (EST) Circuit
 43  Electronic Spark Control (ESC) Circuit
 44  Oxygen Sensor Circuit (Lean Exhaust Indicated)
 45  Oxygen Sensor Circuit (Rich Exhaust Indicated)
 51  Faulty PROM
 52  Fuel CALPAK Error or Missing
 54  Fuel Pump Circuit (Low Voltage)
 55  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.


ALDL Connector (Located Underdash)

The ALDL diagnostic connector is located in the passenger compartment.

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