DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual page 241

*CHECKING THE WATER IN FUEL LAMP OPERATION —
TEST
4 Turn the ignition off.
Disconnect the Water In Fuel Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Water In Fuel Sensor Signal circuit.
Is the resistance below 5.0 ohms?
Yes → Go To 5
→ Repair the Water In Fuel Sensor Signal circuit for an open.
No
5 Turn the ignition off.
Disconnect the Water In Fuel Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 5.0 ohms?
Yes → Go To 6
→ Repair the Sensor Ground circuit for an open.
No
6 Turn the ignition off.
Disconnect the Water In Fuel Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Water In Fuel Sensor Signal circuit.
Is the resistance below 1000.0 ohms?
Yes → Go To 7
→ Repair the Water In Fuel Sensor Signal circuit for a short to
No
7 Turn the ignition off.
Disconnect the Water In Fuel Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between Sensor Ground and the Water In Fuel Sensor Signal
circuit at the WIF Sensor harness connector.
Is the resistance below 1000.0 ohms?
Yes → Repair the Water In Fuel Sensor Signal circuit for a short to
→ Test Complete.
No
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
ground.
Perform ROAD TEST VERIFICATION - VER-2.
Sensor Ground.
Perform ROAD TEST VERIFICATION - VER-2.
DRIVEABILITY - DIESEL
233
Continued
APPLICABILITY
All
All
All
All