| 86-89 2.8L VIN S MFI | |
|---|---|
| 13 | Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds during closed loop operation after the engine had been running for 2 minutes and the throttle angle was above 4%. |
| 14 | Coolant temperature sensor signal indicates a temperature of over 275° F for 3 seconds. |
| 15 | Coolant temperature sensor signal indicates a temperature colder than -47° F for 3 seconds. |
| 21 | TPS voltage was above 2.5 volts for 5 seconds when the MAP sensor signal showed manifold vacuum above 15 pounds or TPS signal voltage was over 4.5 volts. |
| 22 | TPS voltage was under 0.2 volts for 3 seconds when the engine was running. |
| 23 | Manifold air temperature sensor signal showed an air temperature of -31° F for 3 seconds after the engine has been running for 8 minutes. |
| 24 | When engine speed was between 1400 and 3600 RPM and throttle angle was less than 2%, the MAP sensor signal showed low voltage (High manifold vacuum) for at least 3 seconds. |
| 25 | Manifold air temperature sensor signal showed an air temperature over 293° F for more than 3 seconds after the engine has been running for 4 minutes and a vehicle speed was present. |
| 32 | EGR vacuum switch was closed during start-up or idle, or EGR vacuum switch did not close when EGR solenoid was commanded to close by ECM for 5 seconds. |
| 33 | MAF sensor indicated air flow was more than 20 gm/sec for 2 seconds. |
| 34 | MAF sensor signal showed air flow to be less than 2 gm/sec or the MAF circuit was shorted. |
| 41 | The number of crank reference pulses did not match the number according to the PROM when engine speed was under 2000 RPM, or the incorrect PROM has been installed. |
| 42 | The EST signal did not change when the ECM applied bypass voltage to the ignition module. |
| 44 | Oxygen sensor voltage was under 0.2 volts for 60 seconds of closed loop operation. |
| 45 | Oxygen sensor voltage was over 0.7 volts for 30 seconds in a closed loop when throttle angle was between 3% and 45% and engine had been running for at least 1 minute. |
| 51 | PROM error. |
| 52 | CALPAK error. |
| 53 | Charging system voltage was greater than 17.1 volts for 2 seconds. Repair charging system. |
| 54 | Fuel pump signal voltage was less than 2 volts for 1.5 seconds. |
| 55 | ECM error. Replace ECM. |