Trouble Code


This table is based on 1987 TPI engine, other model year may be different.

Code

Contents

Cause

13

Open Oxygen Sensor Open

Faulty oxygen sensor or connection or ECM

14

Coolant Sensor Circuit
(High Temperature Indicated)

Faulty sensor or circuit or ECM

15

Coolant Sensor Circuit
(Low Temperature Indicated)

Faulty sensor or circuit or ECM

21

Throttle Position Sensor(TPS)
(Signal Voltage High)

Faulty sensor or circuit or ECM

22

Throttle Position Sensor(TPS)
(Signal Voltage Low)

Faulty sensor or circuit or ECM

23

Manifold Air temperature(MAT) Sensor
(Low Temperature Indicated)

Faulty sensor or circuit or ECM

24

Vehicle Speed Sensor

Faulty sensor or circuit or ECM

25

Manifold Air temperature(MAT) Sensor
(High Temperature Indicated)

Faulty sensor or circuit or ECM

32

EGR System Failure

Faulty EGR temperature switch or
EGR valve or circuit or ECM

33

Mass Air Flow(MAF) Sensor
(High Air Flow Indicated)

Faulty MAF sensor,Burn-Off relay or
circuit or ECM

34

Mass Air Flow(MAF) Sensor
(Low Air Flow Indicated)

Faulty MAF sensor or circuit or ECM

36

MAF Sensor Burn-Off Function Fault

Faulty MAF Sensor Power Relay

41

Cylinder Select Error
(Faulty Or Incorrect Mem-Cal)

Faulty connections or Mem-Cal or incorrect Mem-Cal installed in ECM or circuit

42

Electronic Spark Timing(EST) Fault

Faulty Ignition Module or circuit or ECM

43

Electronic Spark Control(ESC)

Faulty ESC Module or circuit or Knock Sensor

44

Lean Exhaust Indication

Faulty Oxygen Sensor or circuit or ECM

45

Rich Exhaust Indication

Faulty Oxygen Sensor or circuit or ECM

54

Fuel Pump Circuit (Low Voltage)

Faulty Fuel Pump circuit or Fuel Pump relay or Oil Pressure Switch

51

Faulty Mem-Cal

Clear memory and recheck if Code51 reappears, replace ECM

53

System Over Voltage

Check and repair Charging System

55

ECM

Check ECM Ground and Mem-Cal If ok, ECM replace