Manifold DEF Temperature Is High
Use this procedure to troubleshoot an engine with high manifold DEF temperature. Also, use this procedure if one of the following event codes is active or logged.
Show/hide table
J1939 Code and Description | CDL Code and Description | Comments |
4337-15
Aftertreatment #1 DEF Doser #1 Temperature : High - least severe (1) |
E934(1)
High Aftertreatment #1 DEF Temperature #1 |
The DEF manifold temperature is too high. |
Show/hide table
Associated Codes | ||
---|---|---|
J1939 Code | CDL Code | Troubleshooting Procedure |
4357-5 | 3604-5 | Troubleshooting, "Solenoid Valve - Test" |
4357-6 | 3605-6 | Troubleshooting, "Solenoid Valve - Test" |
- Code
- DEF manifold heater
- Sensor
Show/hide table
Troubleshooting Test Steps | Values | Results |
---|---|---|
1. Check for Codes A. Apply electrical power to the engine. 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 4337-15 code is present. Proceed to Test Step 2. |
2. Check the DEF Manifold Heater A. Remove electrical power from the engine. B. Disconnect the DEF manifold heater from the wiring harness connector. C. Apply electrical power to the engine. D. 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. Return to service. Result: There was 24 VDC at the DEF tank manifold connector. Repair: Replace the DEF manifold heater relay. |
3. Check the DEF Manifold Temperature Sensor A. Apply electrical power to the engine. B. Connect Cat ET. C. Monitor the "DEF Dosing Reagent Temperature" D. The "DEF Dosing Reagent Temperature"should be within |
DEF Manifold Temperature |
Result: The "DEF Dosing Reagent Temperature" is within Verify that the repair eliminated the problem. Result: The "DEF Dosing Reagent Temperature" is greater Repair: Replace the DEF manifold temperature sensor. 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).
Caterpillar Information System:
C175-16 Locomotive Engine Sensor (Data Link Type) - Test
CG137-08 and CG137-12 Engines Catalytic Converter Substrate - Replace - If Equipped
CG137-08 and CG137-12 Engines Catalytic Converter Substrate - Inspect - If Equipped
C175-16 Locomotive Engine Speed Control - Test
CG137-08 and CG137-12 Engines Catalytic Converter Pressure - Test - If Equipped
C175-16 Locomotive Engine SCR Catalyst Temperature Sensor - Test
C175-16 Locomotive Engine NOx Conversion Is Low
G3500J Petroleum Engines Exhaust Manifold
C175-20 Locomotive Engine DEF Tank Sensor - Test
New Oil Pressure Sensor Is Now Used on Certain GEN SETCat Products {1924, 4490} New Oil Pressure Sensor Is Now Used on Certain GEN SETCat Products {1924, 4490}
New Spring Assemblies Are Now Used On Certain C4.4 Generator Sets {7274} New Spring Assemblies Are Now Used On Certain C4.4 Generator Sets {7274}
C12.9 Marine Engines Fumes Disposal Filter Element - Replace - Internal/Centrifugal
New Software Is Used on Certain C18 Industrial Engines {1920} New Software Is Used on Certain C18 Industrial Engines {1920}
G3508J, G3516J, and G3520J Engines Exhaust Manifold - Install - Water Cooled
Customer Interface for Certain CG137 A4 Engines {1901, 4490, 7451} Customer Interface for Certain CG137 A4 Engines {1901, 4490, 7451}
Installation Procedures for the Cat® MineStar Fleet and Detect Proximity Awareness Onboard System {7605, 7610, 7620} Installation Procedures for the Cat® MineStar Fleet and Detect Proximity Awareness Onboard System {7605, 7610, 7620}
C12.9 Marine Engines Coolant - Change
C175-16 Locomotive Engine Turbocharger Exhaust Temperature Sensor
C12.9 Marine Engines Belt - Inspect
C12.9 Marine Engines Belts - Replace
3516C Generator Sets Selective Catalytic Reduction Warning System
C12.9 Marine Engines Crankshaft Vibration Damper - Inspect
C12.9 Marine Engines Engine Air Cleaner Service Indicator - Inspect
C12.9 Marine Engines Engine Oil Level Gauge - Calibrate