1990-1991 5.0L Fuel Injection, VIN F |
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
266° F for 3 seconds. |
15 |
Coolant temperature sensor signal indicates a temperature colder
than -38° F for 3 seconds. |
21 |
TPS voltage was above 2.5 volts for 3 seconds when the MAP sensor
signal showed manifold vacuum to be 15 pounds or more, or TPS was above 4.8 volts at
anytime. |
22 |
TPS voltage was under 0.2 volts for 2 seconds when the engine was
running. |
23 |
Manifold 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 1400 and 3600 RPM and throttle
position angle was less than 2% for at least 4 seconds. |
25 |
Manifold air temperature sensor signal showed an air temperature
over 302° F for 2 seconds after the engine has been running for 2 minutes and vehicle
speed was greater than 5 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 5 seconds
when throttle opening was under 4%. |
34 |
MAP sensor voltage was too low (high vacuum) when engine speed was
over 1200 RPM, or when TPS was over 21% when engine speed was over 1200 RPM. |
41 |
Faulty or incorrect MEM-CAL. |
42 |
The EST signal did not change when the ECM applied bypass voltage to
the ignition module. |
43 |
Knock sensor signal was above 3.5 volts or below 1.5 volts for 0.5
seconds. |
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 50 seconds with a
throttle angle above 2%. |
51 |
MEM-CAL error. |
52 |
CALPAK error. |
53 |
ECM sees a battery voltage of more than 17.1 volts for 2 seconds. |
54 |
Fuel pump voltage was less than 2 volts for 1.5 seconds since the
last reference pulse was received. |
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. |