(Table 63, contd)
Troubleshooting Test Steps
Values Results
6. Investigate Cause of 7440-31 (E1645) Code
Note: Diagnostic code 7440-31 (E1645) indicates that the ex-
haust gas pressure is too low to promote DPF regeneration.
A. Check the exhaust system from the engine to the CEM for gas
leaks.
B. Check the sensors on the CEM for signs of gas leaks.
C. Check that the exhaust system insulation is correctly installed.
Diagnostic code Result: Exhaust gas leaks are found in the exhaust sys-
tem or the CEM.
Repair: Rectify the gas leak or make sure that the CEM
sensors are correctly installed.
Proceed to Test Step 9.
Result: Exhaust system insulation is missing or
damaged.
Repair: Repair the exhaust system insulation.
Proceed to Test Step 9.
Result: There are no exhaust gas leaks and the insula-
tion is OK.
Proceed to Test Step 7.
7. Check the Exhaust Back Pressure Regulator and the NRS
system
A. Use the Electronic service tool to check for diagnostic codes
that are associated with the Exhaust Back Pressure Regulator
(EBPR) or the NRS system.
EBPR and NRS
systems
Result: A diagnostic code is present that is associated
with the EBPR or the NRS system.
Repair: Refer to Troubleshooting, “Diagnostic Trouble
Codes” for information on troubleshooting the code.
Result: There are no diagnostic codes present for the
EBPR or the NRS system.
Proceed to Test Step 8.
8. Check for High Sulfur Fuel
A. Ensure that the correct specification of fuel is being used. Refer
to the Operation and Maintenance Manual for the correct
specification.
Note: If fuel with a high sulfur content is used, this fault will reoc-
cur and a replacement CEM may be required.
Fuel Result: High sulfur fuel is in use.
Repair: Drain the fuel tank, flush the fuel lines, and re-
place the fuel filters.
Refill the fuel system with fuel of the correct specification.
Start the engine and use the electronic service tool to
perform the “Aftertreatment Sulfation Recovery Proce-
dure” .
Result: The fuel is the correct specification.
Contact the Dealer Solutions Network (DSN).
9. Prepare the Unit for Service
A. Start the engine and use the electronic service tool to perform
the “Manual Diesel Particulate Filter Regeneration.”
DPF Result: The soot content of the DPF returns to normal.
Return the unit to service.
Result: The soot content of the DPF remains high.
Contact the Dealer Solutions Network (DSN).
UENR4469-36 129
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
To Next Page
Loading...
