1986-1988 5.0L Carburetor, VIN G |
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 2%, 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 MAP sensor signal. Normal EGR flow
should cause slight decrease in manifold vacuum which would change MAP sensor signal. |
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 under 1200 RPM or the engine speed was over 1200 RPM with a throttle position
angle above 21%. |
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 0.2 volts for 50 seconds of closed
loop operation. |
45 |
Oxygen sensor voltage was over 0.7 volts for 30 seconds of closed
loop operation with a throttle angle between 2% and 20%. |
51 |
PROM error. |
52 |
CALPAK 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. |
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. |