|90-91 5.0L VIN F
||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 minutes 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 4.8 volts
||TPS voltage was under 0.2 volts for 2 seconds when the engine was running.
||Manifold 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 1400 and 3600 RPM and throttle position
angle was less than 2% for at least 4 seconds.
||Manifold air temperature sensor signal showed an air temperature over
302° F for 2 seconds after the engine has been running for 2 minutes and
vehicle speed was greater than 5 MPH.
||EGR open command did not change the fuel mixture when the command was
given during off idle operation. EGR opening should cause the mixture to
be slightly richer because of the low oxygen content of exhaust gas.
||MAP sensor signal voltage was too high (low vacuum) for 5 seconds when
throttle opening was under 4%.
||MAP sensor voltage was too low (high vacuum) when engine speed was over
1200 RPM, or when TPS was over 21% when engine speed was over 1200 RPM.
||Faulty or incorrect MEM-CAL.
||The EST signal did not change when the ECM applied bypass voltage to the
||Knock sensor signal was above 3.5 volts or below 1.5 volts for 0.5 seconds.
||Oxygen sensor voltage was under 0.2 volts for 50 seconds of closed loop
||Oxygen sensor voltage was over 0.7 volts for 50 seconds with a throttle
angle above 2%.
||ECM sees a battery voltage of more than 17.1 volts for 2 seconds.
||Fuel pump voltage was less than 2 volts for 1.5 seconds since the last
reference pulse was received.