AIR CLEANER GP 4710779 - Caterpillar

Illustration 1 g03636920
Schematic diagram for the WIF sensor circuit
Not all connectors are shown. Refer to the Electrical Schematic for the application.
Illustration 2 g02734203
Typical view of the pin location on the P1 connector for the WIF sensor
(30) WIF sensor signal
Table 1
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch to the OFF position.
B. Thoroughly inspect the connector for the WIF sensor and the P1/J1 ECM connector. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Perform a 30 N (10 lb) pull test on each of the wires that are associated with the WIF sensor.
D. Check the harness for abrasions, for pinch points, and for corrosion.
Damaged wire or connector
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.
Result: All connectors, pins, and sockets are correctly connected and/or inserted and the harness is free of corrosion, of abrasion or of pinch points.
Proceed to Test Step 2.
2. Check for Active Diagnostic Codes
A. Connect the electronic service tool to the diagnostic connector.
B. Turn the keyswitch to the ON position.
C. Wait for at least 1 minute.
D. Monitor the active diagnostic code screen on the electronic service tool. Check and record any active diagnostic codes.
Diagnostic codes
Result: A 97-15 diagnostic code is active.
Repair: Ensure that there is no water present in the fuel before continuing with this procedure. Refer to Troubleshooting, "Fuel Contains Water".
Proceed to Test Step 3.
Result: A 97-15 diagnostic code is not active at this time.
If the WIF sensor is not operating correctly, proceed to Test Step 5.
3. Disconnect the WIF Sensor
A. Turn the keyswitch to the OFF position.
B. Disconnect the WIF sensor from the harness.
C. Turn the keyswitch to the ON position. Wait for at least 1 minute.
D. Use the electronic service tool to check for an active 97-15 diagnostic code.
Diagnostic codes
Result: The code disappears with the sensor disconnected.
Repair: Replace the WIF sensor. Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: A 97-15 diagnostic code is still active with the sensor disconnected.
Reconnect the sensor and proceed to Test Step 4.
4. Check the Sensor Signal Wire for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the WIF sensor connector. Disconnect the P1 connector from the ECM.
C. Use a suitable multimeter to check the resistance between P1:30 and all other terminals on the P1 connector.
Greater than 1 k Ohm
Result: At least one of the resistance measurements is less than 1 k Ohm.
The fault is in the wiring between the WIF sensor and the P1 ECM connector.
Repair: Check all wiring between the WIF sensor and the ECM. Refer to the Electrical Schematic for the application.
Replace the faulty wiring.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: Each resistance measurement is greater than 1 k Ohm.
Contact the Dealer Solution Network (DSN).
5. Check that the Sensor is Receiving the