SUPPORT AS 3570813 - Caterpillar

Table 1
Diagnostic Trouble Codes for the Water in Fuel Sensor    
CDL Code    Description    Notes    
3547-3     Water in Fuel System Switch voltage above normal     The Electronic Control Module (ECM) detects the following conditions:
An open circuit in the Water-In-Fuel (WIF) sensor circuit.
The ECM has been powered for less than 5 seconds.
The Water-in-Fuel lamp will stay on when the indicator lamp self check has completed. The ECM will disable the function to detect water in fuel while the code is active.    
3547-4     Water in Fuel System Switch voltage below normal     The Electronic Control Module (ECM) detects the following conditions:
A short circuit in the Water-In-Fuel (WIF) sensor circuit.
The ECM has been powered for less than 5 seconds.
The Water-in-Fuel lamp will stay on when the indicator lamp self check has completed. The ECM will disable the function to detect water in fuel while the code is active.    Water-in-Fuel Sensor OperationThe WIF sensor is a normally open sensor. During normal operation, there will be no signal 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, an E232-1 event code will become active. If the signal remains constant for 1 hour, an E232-2 event code will become active. These event codes can also be caused by a short in the WIF sensor circuit.
Illustration 1 g03567218
Schematic for the WIF sensor
Illustration 2 g03567219
Pin location on the P1 connector for the WIF sensor (44) WIF sensor signal
Illustration 3 g03567222
Connector for the WIF sensor (1) Sensor signal (2) Battery + (3) Sensor ground
Table 2
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
45 N (10 lb) pull test on each of the wires that are associated with the WIF sensor.
D. Check the screw for the ECM connector for the correct torque of
5 N m (44 lb in).
E. Check the harness for abrasions, for pinch points, and for corrosion.
   
Loose connection or damaged wire    
Result: There is a fault in a connector or the wiring.
Repair any faulty connectors or replace the wiring harness. Ensure that all of the seals are properly in place and ensure that the connectors are correctly coupled.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly coupled and/or inserted. The harness is free of corrosion, abrasion, and pinch points.
Proceed to Test Step 2.
   
2. Check For Active Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic connector.
C. Turn the keyswitch to the ON position. If the engine will start, then run the engine.
D. Wait for at least 1 minute.
E. Monitor the active diagnostic code screen on the electronic