
RENR5622 71
Troubleshooting Section
B. Restore electrical power to the ECM.
C. Monitor the diagnostic codes on Cat ET. Check
and record any diagnostic codes.
Note: Wait at least 30 seconds in order for the
diagnostic codes to become active.
D. Determine if a diagnostic code has occurred
several times.
Note: A diagnostic code that is logged several
times is an indication of an intermittent problem.
Most intermi
ttent problems are the result of a bad
connection between a socket and a pin in a connector
or a bad connection between a wire and a terminal.
E. Determine if the problem is active and related to
one of the following diagnostic codes:
•
03
•
04
Expected Result:
A diagnostic code has occurred several times.
Results:
•
OK – A diagnostic code has occurred several
times. Proce
ed to Test Step 2.
•
NotOK-03 –Anactive03diagnosticcodeis
present. Pr
oceed to Test Step 3.
•
NotOK-04 –Anactive04diagnosticcodeis
present. Pr
oceed to Test Step 5.
Test Step 2. Perform t he “Wiggle Test”
on Cat ET
A. Select the “Wiggle Test” from the diagnostic tests
on Cat ET.
B. Choose the appropriate group of parameters to
monitor.
C. Press the “Start” button. Wiggle the wiring harness
for the suspect sensor in order to reproduce an
intermit
tent problem.
If an intermittent problem is detected, the status will
be highli
ghted and an audible beep will be heard.
Expected Result:
No intermittent problems were detected during the
“Wiggle Test”.
Results:
•
OK – No intermittent problems were found. The
harness and connectors appear to be OK. If a
diagnostic co
de is still active, proceed to Test
Step 1 and continue to troubleshoot the active
diagnostic code.
•
Not OK – At least one intermittent problem was
indicated.
Repair: Repair the harness or the connector. Refer
to the diagnostic functional test Troubleshooting,
“Inspecting
Electrical Connectors”. Verify that the
repair eliminates the problem.
STOP.
Test Step 3. Check the Supply Voltage at
the Sensor Con nector
A. Remove electrical power from the ECM.
B. Disconnect
the suspect sensor(s) at the sensor
connector:
C. Restore ele
ctrical power to the ECM.
D. Measure the voltage on the ECM side of the
sensor conn
ector between pin A and pin B for the
suspect sensor(s).
Expected Re
sult:
The supply voltage is 5.0 ± 0.2 VDC.
Results:
•
OK – The vol
tage is 5.0 ± 0.2 VDC. Proceed to
Test Step 4.
•
Not OK – The
voltage is not 5.0 ± 0.2 VDC.
ProceedtoTestStep7.
Test Step 4
. Create a Short at the Sensor
Connector
A. Remove electrical power from the ECM.
B. Disconnect the suspect sensor.
C. Use a wire
jumper in order to create a short
between terminal C (signal) and terminal B
(sensor return) at the sensor connector.
D. Restore electrical p ower to the ECM.
E. Monitor t
he diagnostic codes on Cat ET. Check
for an active 04 diagnostic code for the suspect
sensor.
Note: Wait at least 30 seconds in order for the
diagnostic codes to become active.