1986-1988 2.8L Multi Port Fuel Injection, VIN 9 |
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. |
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. |