GM
| 88-90 5.7L VIN K | |
|---|---|
| 13 | Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds. |
| 14 | Coolant temperature sensor signal indicates a temperature of over 275° F for 2 seconds. |
| 15 | Coolant temperature sensor signal indicates a temperature colder than -27° F for 30 seconds after the engine has been running for at least 30 seconds. |
| 21 | TPS voltage was above 2.5 volts for 8 seconds when the MAP sensor signal showed manifold vacuum to be 15 pounds or more. |
| 22 | TPS voltage was under 0.2 volts for 2 seconds when the engine was running. |
| 23 | Inlet air temperature sensor signal showed an air temperature below -22° F after the engine has been running for 5 minutes. |
| 24 | Vehicle Speed Sensor (VSS) Circuit . |
| 25 | Inlet air temperature sensor signal showed an air temperature over 302° F after the engine has been running for 5 minutes. |
| 32 | EGR open command did not change MAP sensor signal. Normal EGR flow should cause slight decrease in manifold vacuum which would change MAP sensor signal. |
| 33 | MAP sensor signal voltage was too high (low vacuum) for 5 seconds when throttle opening was under 4%. |
| 34 | MAP sensor signal voltage was too low (high vacuum) when engine speed was under 1200 RPM or the engine speed was over 1200 RPM with a throttle position angle above 21%. |
| 35 | Idle Air Control (IAC) System . |
| 42 | The EST signal did not change when the ECM applied bypass voltage to the ignition module. |
| 43 | The ECM did not detect a knock signal during near wide open throttle operation
with coolant temperature above 194° F or the knock signal was present for
5 seconds or more during normal engine operation. Electronic Spark Control (ESC) Circuit . |
| 44 | Oxygen sensor voltage was under 0.2 volts for 50 seconds of closed loop
operation. (Lean Exhaust Indicated) |
| 45 | Oxygen sensor voltage was over 0.7 volts for 30 seconds of closed loop operation with a throttle angle between 2% and 20%.(Rich Exhaust Indicated) |
| 51 | PROM error. (MEM-CAL) |
| 52 | CALPAK error.Fuel CALPAK Missing . |
| 53 | System Over Voltage . |
| 54 | Fuel pump voltage was not present at fuel pump sense line for 2 seconds after the ECM has sent the fuel pump on command.(Low Voltage) |
| 55 | ECM error. Replace ECM.Faulty ECM |