1991 2.3L Multi Port Fuel Injection, VIN A |
13 |
Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60
seconds at throttle angle above 6.5%. |
14 |
Coolant temperature sensor signal indicates a temperature of over
275° F for 3 seconds after engine had been running for at least 10 seconds. |
15 |
Coolant temperature sensor signal indicates a temperature colder
than -22° F after engine had been running for 50 seconds. |
21 |
TPS voltage was above 4.0 volts for 5 seconds when the MAP sensor
signal showed manifold vacuum to be 15 pounds or more, or the TPS voltage was greater than
4.7 volts with throttle closed. |
22 |
TPS voltage was under 0.2 volts for 5 seconds when the engine was
running. |
23 |
Inlet air temperature sensor signal showed an air temperature of
-29° F after the engine has been running for 5 minutes and 20 seconds. |
24 |
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. |
25 |
Inlet Air Temperature Sensor signal showed an air temperature over
318° F with a vehicle speed greater than 15 MPH. |
26 |
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. |
33 |
MAP sensor signal voltage was too high (low vacuum) for 5 seconds
when throttle opening was under 12%. |
34 |
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%. |
35 |
Idle speed was over 175 RPM outside the desired engine speed
commanded by the ECM for at least 5 seconds. |
41 |
ECM had received 8 2X reference pulses without receiving any 1X
reference pulses. |
42 |
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. |
43 |
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. |
44 |
Oxygen sensor voltage was under 0.27 volts for 25 seconds of closed
loop operation. |
53 |
ECM sees a battery voltage of more than 17.1 volts for 0.2 seconds
with ignition on. |
62 |
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. |
65 |
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. |
66 |
A/C refrigerant pressure voltage was either less than 0.1 volts, or
more than 4.9 volts for 5 seconds. |
The Diagnostic Codes and Explanations are derived
from Manufacturer supplied Technical Data. WesTech does not guarantee the accuracy of this
Information nor can it be held liable for providing it. |