LINER 2358930 - Caterpillar

The following conditions must exist before any of the preceding codes will become active:
The ECM has been powered for at least 60 seconds.
There are no active 168 codes.The following background information is related to this procedure:The soot sensor is powered from the switched battery voltage. A signal is sent by the soot sensor to one soot antenna. The signal that is received by the other antenna is sent back to the soot sensor. The signal is attenuated by the soot in the Diesel Particulate Filter (DPF). The soot sensor calculates the soot load in the DPF by measuring the attenuation of the signal.
Illustration 1 g02731949
Schematic diagram for the soot sensor
Illustration 2 g02731948
Pin locations on the P1 connector for the soot sensor (37) CAN C + (38) CAN C -Test Step 1. Inspect Electrical Connectors And Wiring
Check the fuse for the power supply to the soot sensor. If necessary, refer to the Electrical System Schematic.
Thoroughly inspect the connectors for the soot sensor and the antennas.
Refer to Troubleshooting, "Electrical Connectors - Inspect".
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the connector at the soot sensor that are associated with the active diagnostic code.
Check the screw for the ECM connector for the correct torque of 6 N m (53 lb in).
Check the harness for abrasions and for pinch points from the sensors back to the ECM.
Use the electronic service tool to perform a "Wiggle Test". The "Wiggle Test" will identify intermittent connections.Expected Result:Make sure that all connectors, pins, and sockets are correctly installed. The harness should be free of corrosion, abrasions, and pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are in place and ensure that the connectors are correctly coupled.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 2. Verify All Active Diagnostic Codes
Turn the keyswitch to the ON position. Wait at least 10 seconds for activation of the diagnostic codes.
Verify if any of the diagnostic codes that are listed in Table 1 are active.Results:
Diagnostic code 3397-3 is active. - Proceed to Test Step 3.
Diagnostic code 3397-4 is active. - Proceed to Test Step 4.
Diagnostic code 3397-9 is active. - Proceed to Test Step 5.
Diagnostic code 3397-12 is active. - Proceed to Test Step 6.
Diagnostic code 3397-13 is active. - Proceed to Test Step 7.
Diagnostic code 3397-21 is active. - Proceed to Test Step 8.Test Step 3. Check for a High Voltage at the Soot Sensor
Turn the keyswitch to the ON position.
Measure the voltage across pins 1 and 2 on the soot sensor.
Turn the keyswitch to the OFF position.Expected Result:The voltage is less than 32 VDC.Results:
OK - The supply voltage is within the acceptable range for the soot sensor.
STOP
Not OK - The supply voltage is above the acceptable range for the soot sensor.Repair: Investigate the cause