Page 310 - Foton Workshop Manual - Tunland (AT)

04-164 DIAGNOSTICS - ENGINE CONTROL SYSTEM

DTC inspection
DTC DTC defination Trouble location
conditions
Electronic throttle
control actuator drive
circuit - voltage is
P175
04 higher than normal or
short circuit to high
voltage power supply
Electronic accelerator
control actuator drive
circuit - voltage is
P176
below normal or short
circuit to low voltage
power supply • Electronic throttle
control actuator
Electronic throttle • The electronic
control actuator - The • When the key throttle control
P177 mechanical system is switch is in ON actuator connector
not responsive or position, the is in poor contact
misalignment diagnosis continues and the sensor
to run
Engine intake throttle harness is broken
actuator position or shorted .
sensor circuit - • ECM
P3539 voltage is above
normal or shorted to
high voltage power
supply.
Engine intake throttle
actuator position
sensor circuit -
P3541 voltage is below
normal or shorted to
low voltage power
supply.

Diagnosis Procedure

NOTICE

• 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.

Page 310