TIP-DOUBLE SPIKE 4755491 - Caterpillar

Table 1
Diagnostic Trouble Code for SCR Catalyst Has Incorrect Inlet Temperature
J1939 Code Code Description Comments
4337-10 Aftertreatment 1 Diesel Exhaust Fluid Dosing Temperature : Abnormal Rate of Change The Electronic Control Module (ECM) detects that the difference between the Selective Catalytic Reduction (SCR) catalyst intake temperature and the ambient air temperature is implausible.
Follow the troubleshooting procedure in order to identify the root cause of the fault. Complete the procedure in the order in which the steps are listed.
Table 2
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 active or recently logged diagnostic trouble codes.
Diagnostic trouble codes
Result: A 4337-10 diagnostic code is active or recently logged.
Proceed to Test Step 2.
Result: An associated code other than 4337-10 is active or recently logged.
Repair: Troubleshoot the logged or active code. Refer to Troubleshooting, "Diagnostic Trouble Codes".
2. Check the Exhaust System
A. Check the exhaust system for gas leaks between the turbocharger the exhaust tail pipe.
B. Check for gas leaks around all of the sensors in the aftertreatment system.
C. Check for missing or damaged exhaust system insulation.
Exhaust System
Result: The exhaust system has a gas leak.
Repair: Make the necessary repairs.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: The exhaust system insulation is damaged or missing.
Repair: Make the necessary repairs.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: The exhaust system is OK.
Proceed to Test Step 3.
3. Install a Replacement SCR Inlet Temperature Sensor
A. Turn the keyswitch to the OFF position.
B. Install a replacement SCR inlet temperature sensor. Refer to Disassembly and Assembly.
C. Start the engine.
D. Use the electronic service tool to check for an active 4337-10 diagnostic code.
Diagnostic code
Result: The 4337-10 diagnostic code is no longer active.
Return the unit to service.
Result: The 4337-10 diagnostic code is still active.
Contact the Dealer Solution Network (DSN).