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