| 89-90 5.7L VIN 7 TBI |
| 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 |
When engine speed was between 1200 and 4400 RPM and throttle position
angle was less than 2%, the MAP signal showed low voltage (high manifold
vacuum) for at least 5 seconds. |
| 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%. |
| 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. |
| 44 |
Oxygen sensor voltage was under 0.2 volts for 50 seconds of closed loop
operation. |
| 45 |
Oxygen sensor voltage was over 0.7 volts for 30 seconds of closed loop
operation with a throttle angle between 2% and 20%. |
| 51 |
PROM error. |
| 52 |
CALPAK error. |
| 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. |
| 55 |
ECM error. Replace ECM. |
