Page 324 - Foton Workshop Manual - Tunland (AT)

04-178 DIAGNOSTICS - ENGINE CONTROL SYSTEM

DTC inspection
DTC DTC definition Trouble location
conditions
Fan control circuit -
voltage is below • When the key
P245 normal or short circuit switch is turned on • Fan
• The fan connector
04 to low voltage power and the pulse-width
supply modulation device is in poor contact,
is energized or and the relay or
Fan control circuit - harness is broken
voltage is above powered off, the or shorted
diagnosis continues
P2377 normal or short circuit • ECM
to low voltage power to run.
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 fault code related to fan control circuit?
Is the inspection result normal?
YES>To step 2.

NO>Intermittent trouble exists.

2 . Check fan control circuit fuse
(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Unplug fan control circuit fuse F12, F16.
(d) Check whether fan control circuit fuse F12 and F16 is fusing or not.

Is the inspection result normal?
YES>To step 3.

NO>Replace the fuse.

3 . Check main fan relay R5, R16 and auxiliary fan relay R4

Page 324