LOCK 8D7847 - Caterpillar

Table 1
J1939 Code and Description CDL Code and Description Comments
5480-16
Aftertreatment #1 DEF Controller Temperature : High - moderate severity (2) E1430 (2)
High Aftertreatment #1 DEF Controller #1 Temperature The temperature of the Aftertreatment #1 Diesel Exhaust Fluid Control Unit (DCU) #1 has exceeded the trip point of 116° C (240° F).
7528-16
Aftertreatment #1 DEF Controller #2 Temperature : High - moderate severity (2) E1656 (2)
High Aftertreatment #1 DEF Controller #2 Temperature The temperature of the Aftertreatment #1 DCU #2 has exceeded the trip point of 116° C (240° F). Probable Causes
Heat Source
DCURecommended Actions
Illustration 1 g06023936
The DCUs are on the rear of the Pump Electronic Tank Unit (PETU).
(1) DCU 2
(2) DCU 1
Table 2
Troubleshooting Test Steps Values Results
1. Determine the Source of the High Temperature
A. Evaluate the installation location of the Diesel Exhaust Fluid Control Unit (DCU).
B. Check for heat sources close to the DCU.
Heat Source
Result: The DCU is located close to a heat source.
Repair: Eliminate the heat source by installing a heat shield or moving the component creating the heat.
Proceed to Test Step 2.
2. Replace the DCU
DCU
Result: The DCU was replaced.
Verify that the repair eliminated the problem.
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).