3516E Engine for Tier 4 Final 994K Wheel Loaders Caterpillar

DEF Control Module Temperature Is High

Usage:

994K SMX

Use this procedure to troubleshoot a high Diesel Exhaust Fluid Control Unit (DCU) temperature. Also, use this procedure if one of the following event codes is active or logged.

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Table 1
J1939 Code and Description	CDL Code and Description	Comments
5480-15 Aftertreatment #1 DEF Controller Temperature : High - least severe (1)	E1430 (1) 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).
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 DCU #1 has exceeded the trip point of 116° C (240° F).
7528-15 Aftertreatment #1 DEF Controller #2 Temperature : High - least severe (1)	E1656 (1) 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).
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).
7529-15 Aftertreatment #2 DEF Controller Temperature : High - least severe (1)	E1657 (1) High Aftertreatment #2 DEF Controller #1 Temperature (1)	The temperature of the Aftertreatment #2 DCU #1 has exceeded the trip point of 116° C (240° F).
7529-16 Aftertreatment #2 Diesel Exhaust Fluid Controller Temperature : High - moderate severity (2)	E1657 (2) High Aftertreatment #2 DEF Controller #1 Temperature (1)	The temperature of the Aftertreatment #2 DCU #1 has exceeded the trip point of 116° C (240° F).
7535-15 Aftertreatment #2 DEF Controller #2 Temperature : High - least severe (1)	E1658 (1) High Aftertreatment #2 DEF Controller #2 Temperature (1)	The temperature of the Aftertreatment #2 DCU #2 has exceeded the trip point of 116° C (240° F).
7535-16 Aftertreatment #2 Diesel Exhaust Fluid Controller #2 Temperature : High - moderate severity (2)	E1658 (2) High Aftertreatment #2 DEF Controller #2 Temperature (1)	The temperature of the Aftertreatment #2 DCU #2 has exceeded the trip point of 116° C (240° F).

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Illustration 1	g06300380
The DCUs are on the sides of the Pump Electronic Tank Unit (PETU). (1) Aftertreatment #2 .DCU #1 (yellow) (2) Aftertreatment #2 .DCU #2 (red) (3) Aftertreatment #1 .DCU #2 (green) (4) Aftertreatment #1 DCU #1 (blue)

Probable Causes

Heat Source
DCU

Recommended Actions

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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).