170 KENR9126
Troubleshooting Section
b. Monitor the “Active Diagnostic Code” screen
on the electron
ic service tool. Wait at least 30
seconds for activation of the code.
A short circui
t diagnostic code 0535-4 will be
active for the exhaust gas temperature sensor.
c. Remove the el
ectrical power from the ECM.
D. Remove the wire jumper. Reconnect all wires and
connectors
.
Expected Result:
A 0535-3 diagnostic code is active when the sensor
signal wire is open at the ECM connector. A 0535-4
diagnosti
c code is active when the jumper wire is
shorted to engine ground.
Results:
•
OK – The ECM is working properly. The fault is
in the wir
ing between the ECM and the sensor
connector.
Repair: T
he fault is most likely in the signal wire for
the sensor. Repair the signal wire for the sensor.
If neces
sary, perform the “Wiggle Test” on the
electronic service tool.
Use the e
lectronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair eliminates the fault.
STOP.
•
Not OK
– One of the following conditions exists:
The 0535-3 diagnostic code is not active when the
sensor signal wire is disconnected. The 0535-4
diagn
ostic code is not active when the wire jumper
is installed.
Repa
ir: Connect a test ECM. Refer to
Troubleshooting, “Replacing the ECM” and refer to
Troubleshooting, “Test ECM Mode”.
If the test ECM eliminates the fault, reconnect the
suspect ECM. If the fault returns, permanently
ins
tall the new ECM.
Use the electronic service tool in order to clear all
log
ged diagnostic codes and then verify that the
repair eliminates the fault.
ST
OP.
i04012478
Fuel Level - Test
System Operation Description:
Use this procedure to troubleshoot any suspect
problems with the fuel level sensor.
This procedure covers the following diagnostic codes:
•
96-03 Fuel P
ressure Sensor open/short to +batt
•
96-04 Fuel Pressure Sensor short to ground
The fuel level sensor is a passive sensor. The fuel
level sensor does not require an operating voltage in
order to pr
ovide a signal. This configuration utilizes
a fuel level buffer that helps to reduce the amount of
indicator movement that is passed to the fuel gauge.
The buffe
r is powered through a circuit that is wired
directly to a circuit breaker.
When the f
uel tank is full, the fuel level sensor has a
resistance of 33 Ohms. When the fuel tank is empty,
the fuel level sensor has a resistance of 240 Ohms.
The resi
stance from the fuel level sensor varies
between these values as the fuel level varies.
An activ
e diagnostic code for the fuel level sensor is
probably caused by a problem in the wiring harness.
The next likely cause is a problem with the fuel level
sensor
. The least likely cause is a problem with the
Electronic Control Module (ECM).
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