Page 350 - Foton Workshop Manual - Tunland (AT)

04-204 DIAGNOSTICS - ENGINE CONTROL SYSTEM

P418，P428，P429，P1852-FUEL HYDROUS INDICATOR SENSOR

FAULT
P418-FUEL HYDROUS INDICATOR - DATA IS VALID BUT ABOVE

NORMAL OPERATING RANGE - LOWEST SEVERITY LEVEL

04 P428-FUEL HYDROUS INDICATOR CIRCUIT -VOLTAGE IS ABOVE
NORMAL OR SHORTED TO HIGH VOLTAGE POWER SUPPLY

P429-FUEL HYDROUS INDICATOR CIRCUIT -VOLTAGE IS BELOW
NORMAL OR SHORTED TO LOW VOLTAGE POWER SUPPLY

P1852-FUEL WATER INDICATOR - DATA IS VALID BUT ABOVE
NORMAL OPERATING RANGE - MEDIUM SEVERITY LEVEL

Description
1 . Water in fuel sensor is fixed to the fuel filter.The engine control module (ECM)
provides a 5 volt reference signal to the water in fuel sensor. After the water
collected in the fuel filter covers the sensor pins, the water in fuel sensor makes
the 5V reference voltage ground, and indicates that the water in the fuel filter is
high.
Circuit Diagram

Page 350