| Code 11 | Ignition Reference Signal (No distributor reference during cranking) |
| Code 12 | Memory Standby power recently lost |
| Code 13 | Problem in MAP Sensor pneumatic system |
| Code 14 | Problem in MAP Sensor electrical circuit |
| Code 15 | Problem in distance sensor circuit |
| Code 16 | Loss of battery voltage sense |
| Code 17 | Engine running too cool |
| Code 21 | Problem in Oxygen Sensor circuit |
| Code 22 | Problem in Coolant Temperature circuit |
| Code 23 | Problem in Charge Temperature circuit |
| Code 24 | Problem in Throttle position Sensor circuit |
| Code 25 | Problem in AIS (Automatic Idle Speed) driver circuit |
| Code 26 | Peak injector current has not been reached |
| Code 27 | Problem in Fuel circuit in logic module |
| Code 28 | Problem in Canister Purge Solenoid circuit |
| Code 29 | Surge Valve Solenoid |
| Code 31 | Problem in Canister Purge Solenoid circuit |
| Code 32 | Surge Valve Solenoid |
| Code 33 | Problem in Air Conditioning Wide Open Throttle cut out relay driver circuit |
| Code 34 | Problem in Speed Control Driver circuit |
| Code 35 | Problem in Fan Control Relay driver circuit |
| Code 36 | VNT Solenoid # 3 circuit failure |
| Code 37 | Problem in Barometric Read Solenoid circuit |
| Code 41 | Charging System excess or no alternator field current |
| Code 42 | Problem in Auto Shutdown Relay driver |
| Code 43 | Problem in Spark Interface Circuit |
| Code 44 | Battery Temperature out of range or Fusible link J2 failure |
| Code 46 | Battery voltage too high |
| Code 47 | Battery voltage too low |
| Code 51 | Baro Reading out of Range |
| Code 52 | Oxygen Feedback System |
| Code 53 | Internal Logic Module Problem |
| Code 54 | Problem in Distributor sync circuit |
| Code 55 | Indicates End of diagnostic codes |
| Code 61 | Baro Read Circuit Failure |
| Code 62 | Internal Controller Failure |
| Code 63 | Internal Controller Failure |
| Code 64 | VNT Solenoid # 1 Failure |
| Code 65 | VNT Solenoid # 2 Failure |
| Code 67 | Problem in Overboost shutoff system (VNT Overboost Condition) |
| Code 76 | Ballast Bypass Relay failure |
| Code 77 | Speed Control Circuit failure |