168 KENR9126
Troubleshooting Section
Expected Result:
The voltage measurement is 5.0 ± 0.2 Volts DC.
Results:
•
OK – The voltage measurement is 5.0 ± 0.2 Volts
DC. Proceed t
oTestStep3.
•
Not OK – The voltage measurement is not 5.0 ±
0.20 Volts D
C.
Repair: The correct voltage is not reaching the
sensor. Ref
er to Troubleshooting, “Speed Control
(PWM) - Test”.
STOP.
Test Step 3. Check for Active and/or
Logged Diagnostic Codes
A. Connect the electronic service tool to the service
tool connector.
B. Restore the electrical power to the ECM.
C. Monitor
the active diagnostic code screen on the
electronic service tool. Check and record any
active diagnostic codes.
Note: Wait at least 30 seconds in order for the
diagno stic codes to become active.
Note: A diagnostic code that is logged several
times is an indication of an intermittent problem.
Most i
ntermittent problems are the result of a
poor connection between a socket and a pin in a
connector or of a poor connection between a wire
andat
erminal.
D. Look for a 0535-3 diagnostic code or a 0535-4
diag
nostic code.
Expected Result:
No diagnostic codes are active.
Res
ults:
•
OK – No diagnostic codes are active. The problem
app
ears to be resolved.
Repair: The problem may have been intermittent.
Ca
refully reinspect the connectors and wiring.
Refer to Troubleshooting, “Electrical Connectors
- Inspect”.
STOP.
•
N
ot OK – A 0535-4 diagnostic code is active at
this time. Proceed to Test Step 4.
•
Not OK – A 0535-3 diagnostic code is active at
this time. Proc
eed to Test Step 5.
Test Step 4. Disconnect the Sensor in
Order to Create an Open Circuit
A. Remove the electrical power from th e ECM.
B. Disconnect
the sensor from the engine harness.
C. Restore the electrical power to the ECM. Wait at
least 30 sec
onds for activation of the diagnostic
codes.
D. Access the
“Active Diagnostic Codes” screen on
the electronic service tool and check for an active
0535-3 diagnostic code for the suspect sensor.
E. Remove the electrical power from the ECM.
Expected
Result:
A 0535-3 diagnostic code is now active for the sensor.
Results:
•
OK – A 053
5-4 diagnostic code was active before
disconnecting the sensor. A 0535-3 diagnostic code
became active after the sensor was disconnected.
There ma
y be a problem with the sensor.
Repair: Temporarily connect a new sensor to the
harnes
s, but do not install the new sensor in the
engine. Use the electronic service tool in order to
verify that the repair eliminates the fault. If there
are no
active diagnostic codes for the sensor,
permanently install the new sensor.
Use th
e electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair eliminates the fault.
STOP.
•
Not O
K – The 0535-4 diagnostic code is still
present. Leave the sensor disconnected. Proceed
to Test Step 7.
Test Step 5. Check the Signal Wire fo r a
Short Circuit
A. Re
move the electrical power from the ECM.
B. Disconnect the P1 ECM connector.
C. Disconnect the harness connector for the exhaust
gas temperature sensor.
D. Measure the resistance between terminal
P1-54 and the remaining terminals on the ECM
c
onnector.
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