Troubleshooting
Table 96
Troubleshooting Test Steps
Values Results
1. Check for Diagnostic Trouble Codes
A. Connect to the electronic service tool.
B. Turn the keyswitch to the ON position.
C. Access the “Active Diagnostic Code” screen on the elec-
tronic service tool.
Wait at least 30 seconds in order for the diagnostic codes
to become active.
D. Check if any of the diagnostic codes listed in Table 95 are
active or recently logged.
Codes Result: A -3 diagnostic code is active.
Proceed to Test Step 2.
Result: A -4 diagnostic code is active.
Proceed to Test Step 3.
Result: A 3242-0 diagnostic code is active.
Check that the DPF inlet and DOC inlet temperature sensors
are installed in the correct location.
Check all electrical connectors related to the DPF inlet tem-
perature sensor circuit. Refer to Troubleshooting, “Electrical
Connectors - Inspect”
If the connectors are OK, replace the DPF inlet temperature
sensor. Refer to Disassembly and Assembly, “Temperature
Sensor (DPF) - Remove and Install”.
Result: If a diagnostic code is logged but not currently ac-
tive, the fault may be intermittent.
Refer to Troubleshooting, “Electrical Connectors - Inspect” in
order to identify intermittent faults.
2. Create a Short at the Sensor Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the suspect sensor.
C. Install the jumper wire between terminal 1 (sensor signal)
and terminal 2 (sensor return) at the sensor connector.
D. Turn the keyswitch to the ON position.
E. Monitor the diagnostic codes on the electronic service tool.
Check for an active -4 diagnostic code for the suspect sensor.
Wait at least 30 seconds in order for the diagnostic codes
to become active.
F. Turn the keyswitch to the OFF position.
Short Circuit
Recognized
Result: The -3 diagnostic code remains active for the sus-
pect sensor.
Repair: The fault is in the wiring for the suspect sensor.
Check all wiring between the suspect sensor and the ECM.
Refer to the appropriate Electrical Schematic.
Replace the faulty wiring.
Verify that the problem is resolved.
Result: A -4 diagnostic code became active after creating
the short at the sensor connector.
Repair: The wiring is OK. Replace the suspect sensor.
Verify that the problem is resolved.
(continued)
UENR0612-07 207
Circuit Tests
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