Page 347 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-201

DTC inspection
DTC DTC definition Trouble location
conditions
Engine intake air
heater 1 circuit -
P383
current is below
normal or open circuit • When the key 04
switch is turned on
Engine intake air • Intake air heater
and the pulse-width
heater 1 circuit - modulation device • The intake heater
voltage is above connector is in poor
P2555 is started, the
normal or shorted to contact, and the
diagnosis continues
high voltage power relay and wire
to run.
supply harness are broken
• In some cases, the
or shorted.
Engine intake air diagnosis operates
• ECM
heater 1 circuit - at some fixed
voltage is below interval
P2556
normal or short circuit
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.

1 . DTC inspection
(a) Ignition switch: OFF.
(b) Connect the diagnostic apparatus.
(c) Use the diagnostic apparatus, read the fault code.
(d) Confirm whether there is a fault code related to engine intake air heater 1 circuit?

Is the inspection result normal?
YES>To step 2.
NO>Intermittent trouble exists.

2 . Check the intake heater fuse
(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Open the engine compartment relay box and pull out the intake heater fuse F29.
(d) Check whether the intake heater fuse F29 is fusing or not.

Page 347