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13 Open Oxygen Sensor Circuit
14 Coolant Temperature Sensor (High Temp Indicated)
15 Coolant Temperature Sensor (Low Temp Indicated)
16 System Voltage Low
17 Camshaft Position Sensor Circuit Error
21 Throttle Position Sensor (Signal Voltage High)
22 Throttle Position Sensor (Signal Voltage Low)
23 Intake Air Temperature (IAT) Sensor Circuit
24 Vehicle Speed Sensor (VSS) Circuit
25 Intake Air Temp (IAT) Sensor (High Temp Indicated)
26 Quad Driver Fault
28 Transaxle Range Switch Error
33 MAP Sensor Circuit (Signal Voltage High
34 Mass Air Flow Sensor (MAF) Circuit
35 Idle Air Control (IAC) System
36 Ignition 24X Signal Circuit Error
37 TCC Brake Switch Error
41 Ignition Control (IC) Timing Circuit Error
42 Ignition Control (IC) Circuit
43 Knock Sensor (KS) Circuit
44 Oxygen Sensor Circuit (Lean Exhaust Indicated)
45 Oxygen Sensor Circuit (Rich Exhaust Indicated)
51 Mem-Cal Error
53 System Voltage High
54 Fuel Pump Circuit (Low Voltage)
58 Transmission Temperature Sensor Circuit (High Temp)
59 Trans Fluid Temp (TFT) Sensor (High Voltage/Low Temp)
66 Low A/C Refrigerant Charge
70 A/C Pressure Sensor (High) Circuit
72 Vehicle Speed Sensor (VSS) Circuit
75 Digital EGR #1 Solenoid Error
76 Digital EGR #2 Solenoid Error
77 Digital EGR #3 Solenoid Error
79 Transmission Fluid - Over Temperature
80 Transmission Component Slipping
82 Ignition Control 3X Signal Error
85 PROM Error
86 Analog/Digital (A/D) Error
87 Erasable Programmable Read Only Memory (EEPROM) Error
90 TCC Error
96 Transmission System Voltage Low
98
99 Invalid PCM Program

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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