| 86-89 2.8L VIN S MFI |
| 13 |
Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds
during closed loop operation after the engine had been running for 2
minutes and the throttle angle was above 4%. |
| 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
-47° F for 3 seconds. |
| 21 |
TPS voltage was above 2.5 volts for 5 seconds when the MAP sensor
signal showed manifold vacuum above 15 pounds or TPS signal voltage
was over 4.5 volts. |
| 22 |
TPS voltage was under 0.2 volts for 3 seconds when the engine was
running. |
| 23 |
Manifold air temperature sensor signal showed an air temperature of
-31° F for 3 seconds after the engine has been running for 8 minutes. |
| 24 |
When engine speed was between 1400 and 3600 RPM and throttle angle
was less than 2%, the MAP sensor signal showed low voltage (High manifold
vacuum) for at least 3 seconds. |
| 25 |
Manifold air temperature sensor signal showed an air temperature over
293° F for more than 3 seconds after the engine has been running for
4 minutes and a vehicle speed was present. |
| 32 |
EGR vacuum switch was closed during start-up or idle, or EGR vacuum
switch did not close when EGR solenoid was commanded to close by ECM
for 5 seconds. |
| 33 |
MAF sensor indicated air flow was more than 20 gm/sec for 2 seconds. |
| 34 |
MAF sensor signal showed air flow to be less than 2 gm/sec or the
MAF circuit was shorted. |
| 41 |
The number of crank reference pulses did not match the number according
to the PROM when engine speed was under 2000 RPM, or the incorrect PROM
has been installed. |
| 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 over 0.7 volts for 30 seconds in a closed
loop when throttle angle was between 3% and 45% and engine had been
running for at least 1 minute. |
| 51 |
PROM error. |
| 52 |
CALPAK error. |
| 53 |
Charging system voltage was greater than 17.1 volts for 2 seconds.
Repair charging system. |
| 54 |
Fuel pump signal voltage was less than 2 volts for 1.5 seconds. |
| 55 |
ECM error. Replace ECM. |
