C13 Industrial Engine Caterpillar

Water in Fuel - Test

Usage:

C13 JR9

Water-in-Fuel Sensor Operation

The Water-in-Fuel (WIF) sensor is a normally open sensor. During normal operation, no signal is sent from the WIF sensor to the ECM. If water is detected in the fuel, the sensor will send a signal to the ECM. If the signal remains constant for 45 seconds, a 97-15 event code will become active. This event code can also be caused by a short in the WIF sensor circuit.

Water-in-Fuel Sensor Self Check

When the ignition keyswitch is turned to the ON position, the switch in the WIF sensor will close for 5 seconds. If the ECM does not detect a signal from the WIF sensor during this period, a 97-3 diagnostic code will become active.

This procedure covers the following diagnostic code:

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Table 1
Diagnostic Trouble Code for the Water-in-Fuel Sensor
J1939 Code	Description	Notes
97-3	Water in Fuel Indicator : Voltage Above Normal	An open circuit in the Water-In-Fuel (WIF) sensor circuit has been detected.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Inspect the Water in Fuel Sensor A. Turn the keyswitch to the OFF position. B. Disconnect the WIF sensor from the wiring harness connector. C. Use a jumper wire in order to create a short between terminal 1 (SIGNAL) and terminal 2 (RETURN). D. Turn the keyswitch to the ON position. E. Establish communication between Caterpillar Electronic Technician (ET) and the applicable Electronic Control Module (ECM). Refer to Troubleshooting, "Electronic Service Tools", if necessary. F. Look for an active 97-15 code after 45 seconds.	Active Codes	Result: A 97-15 code is active. A failed WIF sensor has been detected. Replace the WIF sensor, return the unit to service. Result: A 97-15 code is not active. Remove the jumper wire. Proceed to Test Step 2.
2. Measure the Voltage at the Sensor Connector A. Turn the keyswitch to the OFF position. B. Disconnect the WIF sensor connector. C. Turn the keyswitch to the ON position. D. Measure the voltage between pin 2 (RETURN) and pin 3 (SUPPLY) on the wiring harness connector for the WIF sensor. E. Turn the keyswitch to the OFF position.	Voltage	Result: The measured voltage is 8VDC/ ±1VDC. There is an open in the signal wire. Refer to the machine-specific schematic in order to troubleshoot the signal wire. Repair or replace the wiring harness as necessary. Return the unit to service. Result: The measured voltage is not 8VDC/ ±1VDC. Proceed to Test Step 3.
3. Measure the Battery Supply Voltage at the Sensor Connector A. Turn the keyswitch to the ON position. B. Measure the voltage between pin 3 (SUPPLY) and a known good ground source on the wiring harness connector for the WIF sensor. C. Turn the keyswitch to the OFF position.	Voltage	Result: The measured voltage is 8VDC/ ±1VDC. There is an open in the return wire. Refer to the machine-specific schematic in order to troubleshoot the return wire. Repair or replace the wiring harness as necessary. Return the unit to service. Result: The measured voltage is not 8VDC/ ±1VDC. There is an open in the supply wire. Refer to the machine-specific schematic in order to troubleshoot the supply wire. Repair or replace the wiring harness as necessary. Return the unit to service.