| 92-93 4.3L VIN Z TBI |
| 13 |
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%. |
| 14 |
Coolant temperature sensor signal indicates a temperature of over
275° F for 2 seconds. |
| 15 |
Coolant temperature sensor signal indicates a temperature colder than
-27° F for 30 seconds after the engine has been running for at least
30 seconds. |
| 21 |
TPS voltage was above 2.5 volts for 8 seconds when the MAP sensor
signal showed manifold vacuum to be 15 pounds or more. |
| 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 below
-22° F after the engine has been running for 5 minutes. |
| 24 |
When engine speed was between 1200 and 4400 RPM and throttle position
angle was less than 3%, the MAP signal showed low voltage (high manifold
vacuum) for at least 5 seconds. |
| 25 |
Inlet air temperature sensor signal showed an air temperature over
302° F after the engine has been running for 5 minutes. |
| 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 5 seconds
when throttle opening was under 4%. |
| 34 |
MAP sensor signal voltage was too low (high vacuum) when engine speed
was over 1200 RPM, or the throttle angle was above 21% when engine speed
was over 1200 RPM. |
| 42 |
The EST signal did not change when the ECM applied bypass voltage
to the ignition module. |
| 43 |
The ECM did not detect a knock signal during near wide open throttle
operation with coolant temperature above 194° F or the knock signal
was present for 5 seconds or more during normal engine operation. |
| 44 |
Oxygen sensor voltage was under 0.25 volts for 50 seconds of closed
loop operation. |
| 45 |
Oxygen sensor voltage was over 0.7 volts for 70 seconds after engine
had been running for 1 minute with a throttle angle between 2 and 20
percent. |
| 51 |
PROM error. |
| 54 |
Fuel pump voltage was not present at fuel pump sense line for 2 seconds
after the ECM has sent the fuel pump on command. |
| 55 |
ECM error. Replace ECM. |
