|94-95 3.1L VIN T/M
||Start of diagnosis
||Oxygen sensor voltage stays between 0.35 and 0.55 volts for 30 seconds
when the TPS signal was above 3%. The engine had been operating in a closed
loop with an engine temperature above 185° F.
||Coolant temperature sensor signal indicates a temperature of over 275°
F after the engine had been running for at least 20 seconds.
||Coolant temperature sensor signal indicates a temperature colder than
||Charging system voltage was below 8 volts for 2 seconds when engine speed
was above 1000 RPM.
||PCM did not detect any cam reference pulses for 3 seconds while engine
||TPS voltage was above 3.8 volts for 10 seconds when engine was running.
||TPS voltage was under 0.2 volts for 3 seconds when the engine was running
at 400 RPM or more.
||Inlet air temperature sensor signal showed an air temperature of -36°
F for 25 seconds after engine had been running for at least 4 minutes.
||Vehicle speed sensor signal showed less than 3 MPH for 4 seconds when
engine speed was greater than 2000 RPM and transmission was not in park
||Inlet air temperature sensor signal showed an air temperature of over
297° F for 2 seconds when vehicle speed was greater than 1 MPH.
||Range signals “A” and “C” were both on for 2 seconds.
||MAP sensor signal voltage was too high (low vacuum) for 4 seconds when
throttle angle was between 3% and 30% and held steady.
||MAP sensor signal voltage was too low (high vacuum) for 2.5 seconds when
engine speed was less than 1200 RPM.
||Idle speed was either above or below desired idle by 300 RPM for 50 seconds.
||PCM did not detect 6 or more consecutive 24X (crank reference) pulses.
||PCM did not receive the TCC brake signal 4 consecutive times when vehicle
speed went from above 35 MPH (for at least 10 seconds) to 0 MPH.
||Clutch switch has failed 4 consecutive times per ignition cycle when vehicle
speed went from 0 to at least 40 MPH and back to 0 again when engine was
||The EST signal was present when the circuit should have been grounded
by the ignition module when it received bypass voltage under 1 volt.
||The EST signal did not change when the ECM applied bypass voltage to the
||The ECM detected knock sensor voltage above 4 volts or below 0.89 volts
for 10 seconds during hard acceleration with engine speed between 3400 and
||Oxygen sensor voltage was under 0.28 volts for 60 seconds of closed loop
||Oxygen sensor voltage was over 0.75 volts for 60 seconds of closed loop
||Anti-theft pass key signal was out of range when the ignition was turned
to ON or START position.
||Charging system voltage was greater than 16.5 volts for 10 seconds.
||Fuel pump voltage was less than 7 volts for 2 seconds since the last reference
pulse was received.
||Transmission fluid temperature sensor signal indicated a temperature higher
than 306° F for 1 second.
||Transmission fluid temperature sensor signal indicated a temperature lower
than -40° F for 1 second.
||A/C system charge was below the given value, or the system line was open
||Right Bank oxygen sensor voltage was between 0.35 and 0.55 volts for 30
seconds with throttle angle above 3%. The engine had been operating in a
closed loop with an engine temperature above 185° F.
||Right Bank oxygen sensor voltage was below 0.28 volts for 60 seconds of
closed loop operation.
||Right Bank oxygen sensor voltage was above 0.75 volts for 60 seconds of
closed loop operation when the throttle angle was between 6% and 20%.
||A/C refrigerant pressure sensor voltage was below 0.1 volt for 5 seconds
when A/C was on.
||A/C refrigerant pressure did not change more than 9 psi when the A/C clutch
had been cycled.
||A/C compressor relay voltage was still applied for more than 10 seconds
after the relay was disengaged by the PCM.
||A/C compressor relay did not show any voltage for 20 seconds after the
A/C was commanded ON by the PCM.
||A/C refrigerant pressure sensor voltage was above 4.9 volts for 5 seconds
when A/C was ON.
||A/C evaporator temperature sensor indicated a temperature below 19° F
for 5 seconds.
||Vehicle speed sensor indicated a sudden change in transmission output
speed of more than 1000 RPM when vehicle was in gear.
||A/C evaporator temperature sensor indicated a temperature above 89° F
for 5 seconds.
||Digital EGR #1 solenoid failed 3 consecutive times.
||Digital EGR #2 solenoid failed 3 consecutive times.
||Digital EGR #3 solenoid failed 3 consecutive times.
||Transmission fluid temperature was over 295° F for 30 minutes.
||Transmission component slip speed was greater than 100 RPM for 10 seconds
while vehicle was in 2nd, 3rd, or 4th gear and throttle angle was between
0% and 35%.
||Brake pedal position (BPP) switch, torque converter clutch (TCC) – circuit malfunction
||3X reference pulses were not detected by PCM during cranking.
||A/D multiplexer chip has shorted to system voltage for 15 seconds.
||TCC solenoid voltage stayed high for 2 seconds after it was turned ON
by the PCM, or the TCC solenoid voltage was 0 volts for 2 seconds after
it was turned OFF by the PCM.
||Pressure control solenoid return amperage varied more than 0.16 amps from
the commanded amperage for at least 1 second.
||Engine control module (ECM) – ignition supply voltage low
||PCM error. Replace PCM.
||PCM error. Replace PCM.