|89 5.7L VIN 8
||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%.
||Coolant temperature sensor signal indicates a temperature of over 266°
F for 3 seconds.
||Coolant temperature sensor signal indicates a temperature colder than
-38° F for 3 seconds.
||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.
||TPS voltage was under 0.2 volts for 3 seconds when the engine was running.
||Manifold air temperature sensor signal showed an air temperature below
-22° F for 12 seconds after I the engine has been running for 5 minutes.
||Vehicle was not in park or neutral while engine speed was between 900
and 4400 RPM for 2 seconds with throttle closed.
||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.
||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.
||MAP sensor signal voltage was too high (low vacuum) for 1 second when
throttle opening was under 2%.
||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%.
||MAF sensor burn-off voltage was missing. Check MAF sensor burn-off relay
and terminal "D" on MAF.
||Faulty or incorrect MEM-CAL.
||The EST signal did not change when the ECM applied bypass voltage to the
||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.
||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
||Oxygen sensor voltage was under 0.2 volts for 50 seconds of closed loop
||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.
||ECM did not receive the proper signal from vehicle anti-theft system when
ignition was turned on.
||Fuel pump voltage was less than 2 volts for 1.5 seconds since the last
reference pulse was received.