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HOSE AS 1695343 - Caterpillar



1695343 HOSE AS Caterpillar parts HOSE
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Alternative (cross code) number:
CA1695343
169-5343
1695343
Caterpillar 1695343 HOSE AS

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Table 1
Diagnostic Trouble Codes for DEF Pressure Is High
J1939 Code and Description Pre-Conditions for Code Comments
4334-3
Aftertreatment #1 DEF #1 Pressure (absolute) : Voltage Above Normal - Battery voltage is normal
- Key switch signal (ECM: V13 & V33, DCU: 18 terminal) is continuously activated more than 2 sec
- Starter Switch signal (ECM: V12 terminal) is not activated except within 2 sec after starter stopped
- CAN communication is normal between DCU and engine ECM Voltage of DEF pump pressure sensor is 4.7 V or more for 30 seconds or more.
4334-4
Aftertreatment #1 DEF #1 Pressure (absolute) : Voltage Below Normal Voltage of DEF pump pressure sensor is 0.1 V or less for 30 seconds or more.
4334-15
Aftertreatment #1 DEF #1 Pressure (absolute) : High - least severe (1) - Key switch signal (ECM: V13 & V33, DCU: 18 terminal) is not activated
- Cooling down and Purge processes are completed
- No DTC invalidation flag DEF pressure is higher than the trigger value after purge process is completed
(DEF pressure should be around 0 kPa in normal)
3 Ignition Cycles or more
4334-16
Aftertreatment #1 DEF #1 Pressure (absolute) : High - moderate severity (2) - Key switch signal (ECM: V13 & V33, DCU: 18 terminal) is activated
- Purge process is not completed
- Thawing process is completed
- DEF Pump is operating
- DEF pressure target is not under-changing
- DEF pump pressure sensor operation is normal
- No DTC invalidation flag Measured DEF pressure minus Target DEF pressure is higher than 100 kPa for at least 60 seconds.
Stop DEF Injection.
4334-17
Aftertreatment #1 DEF #1 Pressure (absolute) : Low - least severe (1) - Key switch signal (ECM: V13 & V33, DCU: 18 terminal) is not activated
- Cooling down and Purge processes are completed
- No DTC invalidation flag DEF pressure is lower than the trigger value after purge process is completed
(DEF pressure should be around 0 kPa in normal)
3 Ignition Cycles or more
4334-18
Aftertreatment #1 DEF #1 Pressure (absolute) : Low - moderate severity (2) - Key switch signal (ECM: V13 & V33, DCU: 18 terminal) is activated
- Purge process is not completed
- Thawing process is completed
- DEF Pump is operating
- DEF pressure target is not under-changing
- DEF pump pressure sensor operation is normal
- No DTC invalidation flag Measured DEF pressure minus Target DEF pressure is higher than 100 kPa for at least 60 seconds.
Stop DEF Injection.
Follow the troubleshooting procedure to identify the root cause of the fault. Two different troubleshooting procedures are required to cover the codes. The first troubleshooting table is for 4334-4, 4334-3, 4334-17, and 4334-15. The second troubleshooting step is for 4334-16 and 4334-18.
Illustration 1 g06148187
Table 2
Troubleshooting Test Steps Values Results
4334-4, 4334-3, 4334-17, and 4334-15
1. Check the DEF Pressure
A. Turn the keyswitch to the ON engine not running.
Approximately 0 kPa
Result: DEF Pressure is not within specification.
Repair: Replace DEF Pump.
Result: DEF Pressure is within specification.
Proceed to Test Step 2.
2. Check the Voltage on the DEF Pump
A. Reconnect the DCU connector.
B. Disconnect the DEF Pump connector.
C. Turn the key switch to ON position and measure the voltage between the DEF Pump Terminals B


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