PULLEY 9M5147 - Caterpillar

The following conditions must exist before any of the above codes will become active:
There are no active 3509 codes.
There are no active 168 codes.The following background information is related to this procedure:The 5 V sensor supply provides power to all 5 V sensors. The ECM supplies 5.0 0.1 V to each of the pressure sensor connectors. The sensor supply is output short circuit protected. A short circuit to the battery will not damage the circuit inside the ECM.
Illustration 1 g06228982
Schematic for the pressure sensors
Illustration 2 g06228992
Pin locations on the P2 connector for the DPF combined pressure sensor
(67) DPF differential pressure signal
(68) DPF differential pressure sensor ground
(69) DPF outlet pressure signal
(70) DPF differential pressure sensor +5 VDC supplyTest Step 1. Inspect Electrical Connectors And Wiring
Thoroughly inspect the terminal connections on the P2/J2 ECM connectors.
Thoroughly inspect the connectors for the DPF pressure sensor.
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 sensor connector for the DPF pressure sensor.
Check the harness for abrasions and for pinch points from the sensors back to the ECM.Expected Result:All connectors, pins, and sockets are correctly connected. 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 replace the harness. Ensure that all the seals are correctly in place and ensure that the connectors are correctly connected.Use the electronic service tool to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 2. Check For 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:
None of the preceding diagnostic codes are active. - Repair: If the codes in Table 1 are logged, an intermittent condition may be causing the logged codes. Refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
An XXXX-3 or XXXX-4 diagnostic code is active for the DPF pressure sensor. - Proceed to Test Step 3.Test Step 3. Check the Supply Voltage at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect the connector for the DPF pressure sensor.
Turn the keyswitch to the ON position. Do not start the engine.
Measure the voltage between terminal 2 and terminal 3 on the harness connector for the DPF pressure sensor. The voltage measurement should be 5.0 0.2 VDC.
Turn the keyswitch to the OFF position.
Reconnect the sensor.Expected Result:The voltage measurement is 5.0 0.2 VDC.Results:
The voltage measurement is not within the expected range - proceed to Test Step 4
The voltage measurement is within the expected range - the correct supply voltage is reaching the sensor. Proceed to Test Step 5.Test Step 4. Check the Supply Voltage From the ECM
Turn the keyswitch to the OFF position.
Disconnect the P2 connector from the ECM.
Turn the keyswitch to the ON position. Do not start the engine.
Measure the voltage between terminal 70 and terminal 68 on