Operation CHARM: Car repair manuals for everyone.

P0178

Tests 1 - 3:




Tests 4 - 7:




SYMPTOM
P0178-WATER IN FUEL SENSOR VOLTAGE TOO LOW

WHEN MONITORED
Ignition ON.

SET CONDITION
Low voltage detected at W/F signal circuit at the Engine Control Module (ECM).

POSSIBLE CAUSES
- Water in fuel sensor signal circuit shorted to ground
- Water in fuel sensor signal circuit shorted to sensor ground
- Engine control module
- Water in fuel sensor