Table 138
Troubleshooting Test Steps
Values Results
1. Check for Diagnostic Trouble Codes
A. Turn the keyswitch to the ON position. Do not start the engine.
B. Connect to the electronic service tool.
C. Check for associated diagnostic trouble codes.
Diagnostic trou-
ble codes
Result: A 4360-16 (E946 (2)) code is active or recently
logged.
Proceed to Test Step 2.
Result: A 4360-17 (E947 (1)), or 4360-18 (E947 (2))
code is active or recently logged.
Proceed to Test Step 3.
Result: An associated code other than listed in Table
137 is active or recently logged.
Repair: Troubleshoot the logged or active code. Refer to
Troubleshooting, “Diagnostic Trouble Codes”.
Result: No codes are active or recently logged.
For engines that have a DPF, proceed to Test Step 4.
For engines that do not have a DPF, proceed to Test Step
5.
2. Check for Cause of High Temperature
A. Check for evidence of an exothermic event in the DOC and
DPF (if applicable).
B. Check for evidence of excessive fuel reaching the DOC or DPF
(if applicable)
High
temperature
Result: There has been an exothermic event in the DOC
or DPF.
Repair: Replace the Clean Emissions Module (CEM).
Result: There is evidence of excessive fuel reaching the
DOC or DPF.
Repair: Investigate the cause of the excess fuel.
Result: There is no evidence of an exothermic event or
fuel in the aftertreatment module.
Repair:
Perform the “Aftertreatment Recovery Procedure” . Moni-
tor the SCR inlet temperature.
Note: Engine RPM Override may be necessary to com-
plete the Aftertreatment Recovery Procedure.
If the SCR inlet temperature is abnormal, install a re-
placement SCR temperature sensor. Refer to Disassem-
bly and Assembly, Temperature Sensor (Exhaust) -
Remove and Install (Selective Catalytic Reduction (SCR)
Temperature Sensor).
(continued)
256 UENR4469-36
Symptom Troubleshooting
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