Page 808 - Workshop Manual - Tunland (2017)

04-122 DIAGNOSTICS - ENGINE CONTROL SYSTEM

04 DTC inspection
DTC DTC definition Trouble location
conditions

Fuel hydrous
indicator - data is
valid but above
P418
normal operating
range - lowest
severity level
Fuel hydrous
• When the key
indicator sensor
switch is in ON
circuit -Voltage is • Water in fuel sensor
P428 position, the
above normal or • Water in fuel sensor
diagnosis continues
shorted to high to run. connector is in poor
voltage power supply contact, the
harness is open or
Fuel hydrous
indicator sensor shorted
circuit -Voltage is • ECM
P429
below normal or
shorted to low voltage
power supply

Fuel water indicator -
• During engine
data is valid but operation, the
P1852 above normal
diagnosis continues
operating range -
to run
medium severity level

Diagnosis Procedure

CAUTION

• To implement the following steps, ensure that ECM is grounded properly.
• Before conducting electric diagnosis, do refer to the reference circuit diagram
and the element information.
• Before conducting measurement, check the pins of connectors for rupture,
looseness and rust, and ensure that the pins are contacted properly.
• If the connection is good, check the sensor signal voltage when moving the
connector and harness. If a fault occurs, the voltage display on the diagnostic
instrument will change.

1 . DTC inspection

(a) Ignition switch: OFF.
(b) Connect the diagnostic apparatus.
(c) Use the diagnostic apparatus, read the fault code.
(d) 确认是否存在燃油含水指示灯传感器相关的故障码？

Is the inspection result normal?

YES>To step 2.