C175-16 Locomotive Engine Caterpillar


Manifold DEF Temperature Is Low

Usage:

C175-16 3B9
Use this procedure to troubleshoot a low DEF temperature. Also, use this procedure if the following event code is active or logged.

Table 1
J1939 Code and Description  CDL Code and Description  Comments 
4337-17
Aftertreatment #1 DEF Doser #1 Temperature : Low - least severe (1) 
E936(1)
Low Aftertreatment #1 DEF Temperature #1 
The DEF manifold temperature is low. 
4337-18
Aftertreatment #1 DEF Doser #1 Temperature : Low - moderate severity (2) 
E936(2)
Low Aftertreatment #1 DEF Temperature #1 
The DEF manifold temperature is low. 

Table 2
Associated Codes 
J1939 Code  CDL Code  Troubleshooting Procedure 
4357-5  3604-5  Troubleshooting, "Solenoid Valve - Test" 
4357-6  3605-6  Troubleshooting, "Solenoid Valve - Test" 

Probable Causes

  • Codes

  • DEF manifold heater

  • Relay

Recommended Actions

Table 3
Troubleshooting Test Steps  Values  Results 

1. Check for Codes

A. Turn the keyswitch to ON.

B. Connect Cat® Electronic Technician (ET) to the service tool connector.

C. Look for active codes that are associated with the system for the event code.
 

Codes 

Result: An associated code is present.

Repair: Troubleshoot any associated codes before continuing with this test.

Result: A 4337 code is present.

Proceed to Test Step 2.
 

2. Check the DEF Manifold Heater

A. Turn the keyswitch to OFF.

B. Disconnect the DEF manifold heater from the wiring harness connector.

C. Turn the keyswitch to ON.

D. Connect Cat ET.

E. Use Cat ET to activate the following overrides:

- "Aftertreatment #1 DEF Manifold Heater Relay Override"

F. Measure the voltage on the DEF manifold heater wiring harness connector.
 

24 VDC 

Result: There was NOT 24 VDC at the DEF tank manifold connector.

Proceed to Test Step 3.

Verify that the repair eliminated the problem. Return to service.

Result: There was 24 VDC at the DEF manifold connector.

A failed manifold heater has been detected.

Repair: Replace the DEF manifold heater.

Verify that the repair eliminated the problem.
 

3. Check the Power Supply to the DEF Manifold Heater Relay

A. Turn the keyswitch to ON.

B. Measure the voltage between the DEF manifold heater relay power supply terminal 1 and a known good ground.
 

24 VDC 

Result: There was 24 VDC between the DEF manifold heater relay power supply terminal 1 and a known good ground.

Repair: Replace the DEF manifold heater relay.

Verify that the repair eliminated the problem.

Result: There was NOT 24 VDC between the DEF manifold heater relay power supply terminal 1 and a known good ground.

There is a problem with the wiring between the 24 VDC power supply on the engine interconnect harness and the DEF manifold heater relay.

Repair: Repair or replace the wiring harness.

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).

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