TIP-PENETRATION PLUS 4755494 - Caterpillar

Table 1
Diagnostic Trouble Codes
J1939 Code Code Description Comments
4334-3 Aftertreatment #1 SCR Dosing Reagent Absolute Pressure : Voltage Above Normal The Electronic Control Module (ECM) detects that the signal from the Diesel Exhaust Fluid (DEF) pump pressure sensor is greater than 4.75 V for at least 1 second.
The battery voltage is at least 10 V.
The warning lamp will come on.
4334-4 Aftertreatment #1 SCR Dosing Reagent Absolute Pressure : Voltage Below Normal The ECM detects that the signal from the DEF pump pressure sensor is less than 0.25 V for at least 1 second.
The battery voltage is at least 10 V.
The warning lamp will come on.
Follow the troubleshooting procedure in order to identify the root cause of the problem.
Illustration 1 g03726274
Schematic diagram for the DEF pump pressure sensor
Illustration 2 g03726284
View of the pin locations on the P2 ECM connector for the DEF pump pressure sensor
(5) DEF pump pressure sensor ground
(7) DEF pump pressure sensor supply (+5 V)
(56) DEF pump pressure sensor signal
Illustration 3 g03720379
Pin locations on the DEF pump module connector
(8) DEF pump pressure sensor ground
(9) DEF pump pressure sensor signal
(10) DEF pump pressure sensor supply (+5 V)
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Inspect the P2/J2 ECM connector.
B. Inspect the connector for the DEF pump.
C. Perform a 30 N (6.7 lb) pull test on each of the wires in the ECM connector and the connector for the DEF pump.
D. Check all of the wiring associated with the DEF pump for abrasions and pinch points.
Damaged wire or connector
Result: A damaged wire or damaged connector was not found.
Proceed to Test Step 2.
Result: A damaged wire or damaged connector was found.
Repair: Repair the damaged wire or the damaged connector.
Use the electronic service tool to clear all logged diagnostic codes. Verify that the repair eliminates the fault.
2. Check for Active Diagnostic Codes
A. Establish communication between the electronic service tool and the ECM. Refer to Troubleshooting, "Electronic Service Tools"
B. Check for active or logged codes.
Diagnostic Trouble Codes
Result: There is an active or logged , 4334-3 or 4334-4 diagnostic code.
Proceed to Test Step 3.
3. Check the Sensor Supply and Ground Wiring
A. Turn the keyswitch