|91 2.3L VIN D MFI
||Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds
at throttle angle above 6.5%.
||Coolant temperature sensor signal indicates a temperature of over 275°
F for 3 seconds after engine had been running for at least 10 seconds.
||Coolant temperature sensor signal indicates a temperature colder than
-22° F after engine had been running for 50 seconds.
||TPS voltage was above 4.0 volts for 5 seconds when the MAP sensor signal
showed manifold vacuum to be 15" or more, or the TPS voltage was greater
than 4.7 volts with throttle closed.
||TPS voltage was under 0.2 volts for 5 seconds when the engine was running.
||Inlet air temperature sensor signal showed an air temperature of -29°
F after the engine has been running for 5 minutes and 20 seconds.
||Vehicle was not in park or neutral for 20 seconds when throttle position
signal was over 7% with engine speed between 1600 and 3600 RPM and the MAP
signal showed low manifold vacuum.
||Inlet air temperature sensor signal showed an air temperature over 318°
F with a vehicle speed greater than 15 MPH.
||Quad-driver sense voltage shows a low voltage for 5 seconds when battery
voltage should be present or if the sense voltage shows battery voltage
for 20 seconds when a low voltage should be present.
||MAP sensor signal voltage was too high (low vacuum) for 5 seconds when
throttle opening was under 12%.
||MAP sensor signal voltage was too low (high vacuum) for 0.2 seconds when
engine speed was under 1200 RPM or when throttle opening was over 15.2%.
||Idle speed was over 175 RPM outside the desired engine speed commanded
by the ECM for at least 5 seconds.
||ECM had received 8 2X reference pulses without receiving any 1X reference
||The EST circuit had an open or a ground and the signal did not change
when the ECM applied bypass voltage to the ignition module.
||Knock sensor voltage was either below 1.25 volts or above 3.75 volts for
5 seconds, or the knock signal was present for 3.67 seconds or more during
normal engine operation.
||Oxygen sensor voltage was under 0.27 volts for 25 seconds of closed loop
||ECM sees a battery voltage of more than 17.1 volts for 0.2 seconds with
||Vehicle was in park or neutral at a speed less than 5 MPH when vehicle
was in 2nd or 3rd gear, or vehicle speed was greater than 50 MPH when vehicle
was in 1st or 2nd gear for 20 seconds.
||Fuel injector driver current did not reach 4 amps. Injectors commanded
"ON" longer than the calibrated pulse width and battery voltage
was more than 9 volts for 10 seconds.
||A/C refrigerant pressure voltage was either less than 0.1 volts, or more
than 4.9 volts for 5 seconds.