1989-1991 2.5L Throttle Body Injection, VIN
R |
13 |
Oxygen sensor voltage stays between 0.35 and 0.55
volts for 3 seconds during closed loop operation after the engine had been
running for 40 seconds and the throttle angle was above 7%. (For the
Lumina the oxygen sensor voltage stays between 0.35 and 0.55 volts for 60
seconds after the engine had been running for 2 minutes). |
14 |
Coolant temperature sensor signal indicates a
temperature of over 275° F for 3 seconds. |
15 |
Coolant temperature sensor signal indicates a
temperature colder than -22° F for 60 seconds after the engine has been
running for 2 minutes. |
21 |
TPS voltage was above 2.5 volts for 2 seconds when the
MAP sensor signal showed manifold vacuum to be 15 pounds or more under
1800 RPM. |
22 |
TPS voltage was under 0.2 volts for 2 seconds when the
engine was running. |
23 |
Inlet air temperature sensor signal showed an air
temperature of -31° F after the engine has been running for 2
minutes. |
24 |
When engine speed was between 1400 and 4400 RPM, the
MAP sensor signal showed low voltage (High manifold vacuum) for at least 5
seconds. |
25 |
Inlet air temperature sensor signal showed an air
temperature over 275° F for more than 2 seconds after the engine has been
running for 5 minutes and vehicle speed was greater than 44 MPH. |
32 |
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. |
33 |
MAP sensor signal voltage was too high (low vacuum)
for at least 5 seconds when throttle opening was under 2%. |
34 |
MAP sensor signal voltage was too low (high vacuum)
when engine speed was under 1200 RPM or when engine speed was over 1200
RPM with throttle opening was over 20%. |
35 |
Idle speed was over 150 RPM outside the desired engine
speed commanded by the ECM. |
42 |
The EST signal did not change when the ECM applied
bypass voltage to the ignition module. |
44 |
Oxygen sensor voltage was under 0.2 volts for 60
seconds of closed loop operation. |
45 |
Oxygen sensor voltage was above specification. Century
and Cutlass Ciera was over 0.75 volts for 50 seconds in a closed loop.
Lumina was over 0.7 volts for 30 seconds and throttle angle was between 3%
and 45%. |
51 |
PROM error. |
53 |
Charging system voltage was greater than 16.9 volts
for more than 50 seconds. Repair charging system. |
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. |