|92 5.7L VIN 7 TBI
||Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds.
||Coolant temperature sensor signal indicates a temperature of over 275°
F for 2 seconds.
||Coolant temperature sensor signal indicates a temperature colder than
-27° F for 30 seconds after the engine has been running for at least 30
||TPS voltage was above 2.5 volts for 8 seconds when the MAP sensor signal
showed manifold vacuum to be 15 pounds or more.
||TPS voltage was under 0.2 volts when the engine was running.
||Inlet air temperature sensor signal showed an air temperature below 22°
F after the engine has been running for 5 minutes.
||When engine speed was between 1200 and 4400 RPM and throttle position
angle was less than 3%, the MAP signal showed low voltage (high manifold
vacuum) for at least 5 seconds.
||Inlet air temperature sensor signal showed an air temperature over 302°
F after the engine has been running for 5 minutes. On Brougham models the
inlet air temperature sensor signal shows a temperature above 297° F with
an engine speed greater than 35 MPH.
||EGR open command did not change the MAP sensor signal. Normal EGR flow
should cause slight decrease in manifold vacuum which would change MAP sensor
||MAP sensor signal voltage was too high (low vacuum) for 5 seconds when
throttle opening was under 4%.
||MAP sensor signal voltage was too low (high vacuum) when engine speed
was over 1200 RPM.
||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
4 seconds or more during normal engine operation.
||Oxygen sensor voltage was under 0.25 volts for 50 seconds of closed loop
operation. On Brougham models the oxygen sensor voltage was under 0.2 volts.
||Oxygen sensor voltage was over 0.75 volts for 30 seconds with a throttle
angle above 20%. On Brougham models the oxygen sensor voltage was over 0.7
||Fuel pump voltage was not present at fuel pump sense line for 2 seconds
after the ECM has sent the fuel pump on command.
||ECM error. Replace ECM.