HARNESS AS-SENSOR 4853732 - Caterpillar

Table 1
Diagnostic Trouble Codes for Diesel Particulate Filter (DPF) Collects Excessive Soot
J1939 Code Description Notes
3251-16 Particulate Trap Differential Pressure : High - moderate severity (2) The Electronic Control Module (ECM) detects the following conditions:
The differential pressure across the DPF is high for at least 100 seconds. The pressure at which this code becomes active is dependent on the level of soot indicated by the soot model that is calculated by the ECM.
The battery voltage is at least 10 VDC.
If equipped, the warning lamp will flash. The engine will be derated.
3251-0 Particulate Trap Differential Pressure : High - most severe (3) The Electronic Control Module (ECM) detects the following conditions:
The differential pressure across the DPF is very high for at least 100 seconds. The pressure at which this code becomes active is dependent on the level of soot indicated by the soot model that is calculated by the ECM.
The battery voltage is at least 10 VDC.
If equipped, the warning lamp will flash and the shutdown lamp will come on.
3719-0 Aftertreatment 1 Diesel Particulate Filter Soot Load Percent : High - most severe (3) The ECM detects that the soot level in the DPF is high.
The warning lamp will come on.
3719-16 Aftertreatment 1 Diesel Particulate Filter Soot Load Percent : High - moderate severity (2) The ECM detects that the soot load in the DPF is very high.
The warning lamp will flash. The engine may be derated. The Electronic Control Module (ECM) uses the Diesel Particulate Filter (DPF) differential pressure sensor to monitor the soot load in the DPF. An excessive accumulation of soot in the DPF can be caused by the following faults:Probable Causes
Faulty injectors
Incorrect Wiring for Temperature Sensors
Individual malfunctioning cylinders
Low exhaust gas temperature
A faulty valve in the NOx Reduction System (NRS)Recommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.Note: Engine operation must be kept to a minimum in order to minimize the amount of soot that is created. Follow the troubleshooting procedure in order to minimize the amount of engine operation.
Table 2
Troubleshooting Test Steps Values Results
1. Diagnostic Codes
A. Establish communication between the electronic service tool and the Electronic Control Module (ECM).
B. Check for active diagnostic codes. Check specifically for codes that relate to the "Probable Causes" in this procedure.
Diagnostic codes
Result: A diagnostic trouble code is active or logged.
Repair: Troubleshoot any related diagnostic codes before continuing with this procedure.
Result: A related diagnostic trouble code is not active or logged.
Proceed to Test Step 2.
2. Incorrect Wiring for Temperature Sensors
A. Check that the Diesel Oxidation Catalyst (DOC) inlet temperature sensor and DPF inlet temperature sensor wiring has not been switched.
Note: The engine may run without indicating a fault for many hours with this condition.
B. Check that the wiring for the DOC inlet temperature and the DPF inlet temperature sensor is connected to the correct ECM pins.
Refer to the Electrical Schematic for the application.
Wiring
Result: The wiring for the DOC inlet temperature sensor or the DPF inlet temperature sensor is incorrect.
Repair: Repair the faulty wiring or