834778T 5 Mercury CYLINDER HEAD

Table 1
Diagnostic Trouble Code for the Water-in-Fuel Sensor
J1939 Code Description Notes
97-3 Water In Fuel Indicator : Voltage Above Normal The 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 warning lamp will stay on when the "indicator lamp self check" has been 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, a 97-15 diagnostic code will become active. This diagnostic code can also be caused by a short in the WIF sensor circuit.Water-in-Fuel Sensor Self CheckWhen 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.
Illustration 1 g02369158
Typical example of the schematic for the WIF sensor
Illustration 2 g02196433
Typical view of the pin locations on the P1 connector for the WIF sensor
(4) 8 VDC supply
(5) Sensor return
(35) WIF sensor signal
Illustration 3 g02857417
Typical view of the connector for the WIF sensor
(1) Signal
(2) Return
(3) 8 VDC supply Test Step 1. Inspect Electrical Connectors And Wiring
Turn the keyswitch to the OFF position.
Thoroughly inspect the connector for the WIF sensor and the P1/J1 ECM connector. Refer to Troubleshooting, "Electrical Connectors - Inspect"
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the WIF sensor.
Check the screws for the ECM connector for the correct torque of 6 N m (53 lb in).
Check the harness for abrasions, for pinch points, and for corrosion. Expected Result:All connectors, pins, and sockets are correctly connected. The harness is free of corrosion, of abrasion, and of pinch points.Results:
The connectors and wiring appear to be OK - Proceed to Test Step 2.
There is a fault in the connectors and/or wiring. - Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are correctly installed and ensure that the connectors are correctly connected.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. Check for Active Diagnostic Codes
Connect the electronic service tool to the diagnostic connector.
Turn the keyswitch to the ON position.
Wait for at least 1 minute.
Monitor the active diagnostic code screen on the electronic service tool. Check and record any active diagnostic codes. Expected Result:A 97-3 or a 97-15 diagnostic code is active at this time.Note: For a 97-15 diagnostic code, refer to Troubleshooting, "Fuel Contains Water" before continuing with this procedure.Results:
One of the preceding diagnostic codes is active at this time. - Proceed to Test Step 3.
Neither of the preceding diagnostic codes are active at this time. - The fault may be intermittent.Repair: Refer to Troubleshooting, "Electrical Connectors - Inspect" to identify intermittent faults.STOPTest Step 3. Check the Supply Voltage at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect the WIF sensor from the harness.
Turn the keyswitch to the ON position.
Measure the voltage between pin 2 and pin 3 on the harness connector for the WIF sensor. Expected Result:The measured voltage should be between 7.5 VDC and 8.5 VDC.Results:
OK - The voltage is within the expected range. Reconnect the WIF sensor to the harness. Proceed to Test Step 4.
Not OK - The voltage is not within the expected range. The fault is in the 8 VDC supply wire or the return wire between the WIF sensor and the ECM.Repair: Repair the faulty wiring or replace the faulty wiring.Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.STOPTest Step 4. Check that the Diagnostic Code is Still Active
Connect the electronic service tool to the diagnostic connector.
Turn the keyswitch to the ON position.
Wait for at least 1 minute.
Monitor the active diagnostic code screen on the electronic service tool. Check and record any active diagnostic codes. Expected Result:A 97-3 or a 97-15 diagnostic code is active at this time.Results:
A 97-3 diagnostic code is active. - Proceed to Test Step 5.
A 97-15 diagnostic code is active. - Proceed to Test Step 6.Test Step 5. Create a Short Circuit at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect the WIF sensor from the harness.
Fabricate a jumper wire that is 150 mm (6 inch) long.
Use the jumper to connect terminal 1 to terminal 2 on the harness connector for the WIF sensor.
Turn the keyswitch to the ON position. Wait for at least 1 minute.
Monitor the active diagnostic code screen on the electronic service tool. Check and record any active diagnostic codes. Expected Result:A 97-15 diagnostic code is active with the jumper installed.Results:
A 97-3 diagnostic code was active before installing the jumper. A 97-15 diagnostic code was active with the jumper installed. - There is an open circuit in the WIF sensor.Repair: Perform the following repair:
Install a replacement sensor. Refer to Disassembly and Assembly, "Water Separator and Fuel Filter (Primary) - Remove and Install" for the correct procedure.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault. STOP
There is still an active 97-3 diagnostic code with the jumper installed. - The sensor is OK. Proceed to Test Step 7.Test Step 6. Create an Open Circuit at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect the WIF sensor from the harness.
Turn the keyswitch to the ON position. Wait for at least 1 minute.
Monitor the active diagnostic code screen on the electronic service tool. Check and record any active diagnostic codes. Expected Result:A 97-3 diagnostic code is active with the WIF sensor disconnected.Results:
A 97-15 diagnostic code was active with the WIF sensor connected. A 97-3 diagnostic code was active