| 90-91 5.7L VIN 8 |
| 13 |
Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds.
Engine was at normal operating temperature and had been running for
at least 2 seconds after start with a throttle angle above 5%. |
| 14 |
Coolant temperature sensor signal indicates a temperature of over
266° F for 3 seconds. |
| 15 |
Coolant temperature sensor signal indicates a temperature colder than
-38° F for 3 seconds. |
| 21 |
TPS voltage was above 2.5 volts for 3 seconds when the MAP sensor
signal showed manifold vacuum to be 15 pounds or more, or TPS was above
4.5 volts at any time. |
| 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 below
-22° F for 12 seconds after the engine has been running for 5 minutes. |
| 24 |
Vehicle speed was 0 MPH when engine speed was between 900 and 3000
RPM and throttle position angle was less than 2% for at least 4 seconds. |
| 25 |
Manifold air temperature sensor signal showed an air temperature over
302° F for 12 seconds after the engine has been running for 4 minutes
and vehicle speed was above 5 MPH. |
| 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 1 second when
throttle opening was under 2%. |
| 34 |
MAP sensor signal voltage was too low (high vacuum) when engine speed
was under 600 RPM or the engine speed was over 600 RPM with a throttle
position angle above 6%. |
| 41 |
Faulty or incorrect MEM-CAL. |
| 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, or the knock sensor voltage was above 3.62 volts or below
1.44 volts for 0.5 seconds. |
| 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 above 2%. The engine was running
for at least 1 minute. |
| 46 |
ECM did not receive the proper signal from vehicle anti-theft system
when ignition was turned on. |
| 51 |
MEM-CAL error. |
| 52 |
Engine oil temperature was below -31° F after the engine had been
running for 30 minutes. |
| 53 |
ECM sees a battery voltage either above 17.1 volts or below 8.0 volts. |
| 54 |
Fuel pump voltage was less than 2 volts for 1.5 seconds since the
last reference pulse was received. |
| 62 |
Engine oil temperature was above 284° F after engine had been running
for 30 minutes. |
