| 90-91 3.1L VIN V MFI | |
|---|---|
| 13 | Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds when the TPS signal was above 4%. The engine had been running for at least 2 minutes. |
| 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 -38° F for at least 20 seconds. |
| 21 | TPS voltage was above 4.3 volts for 10 seconds when engine was running and air flow was less than 17 gm/sec. |
| 22 | TPS voltage was under 0.25 volts for 4 seconds when the ignition was on. |
| 23 | Manifold air temperature sensor signal showed an air temperature of -31° F for 10 seconds after engine had been running for 4 minutes. |
| 24 | Engine speed was between 2200 and 4400 RPM and transmission was not in park or neutral and TPS was less than 2% for 3 seconds. |
| 25 | Manifold air temperature sensor signal showed an air temperature over 293° F for 3 seconds when vehicle speed was greater than 3 MPH and engine had been running for 8 minutes. |
| 26 | Quad-driver sense voltage showed a low voltage when battery voltage should be present, or the sense voltage showed battery voltage when a low voltage should be present. |
| 32 | The ECM opens each EGR control valve during deceleration and monitors the change in manifold vacuum. The code sets when the change in manifold vacuum is outside the normal range. |
| 33 | MAP sensor voltage was too high for 4.8 seconds when throttle angle was less than 2%. |
| 34 | MAP sensor voltage was too low for 1 second when engine speed was under 600 RPM, or MAP sensor voltage was too low for 1 second when engine speed was over 600 RPM and throttle angle was above 20%. |
| 35 | Engine idle speed is either 300 RPM above or below the desired idle speed for 50 seconds. |
| 41 | Faulty or incorrect MEM-CAL. |
| 42 | The EST signal did not change when the ECM applied bypass voltage to the ignition module. |
| 43 | Knock sensor signal was either above 3.5 volts or below 1.5 volts for at least 0.5 seconds. |
| 44 | Oxygen sensor voltage was under 0.2 volts for at least 60 seconds of closed loop operation. |
| 45 | Oxygen sensor voltage was over 0.7 volts for 50 seconds in closed loop operation with a throttle angle between 3% and 45%. |
| 51 | MEM-CAL error. |
| 52 | CALPAK error. |
| 53 | ECM sees a battery voltage of more than 17.1 volts for 2 seconds. |
| 54 | Fuel pump voltage was less than 4 volts for 0.4 seconds. |
| 62 | Vehicle gear commanded by ECM did not match actual gear selected. |
| 66 | A/C pressure sensor voltage was either above 4.9 volts or below 0.1 volts for at least 5 seconds. |