Page 780 - Workshop Manual - Tunland (2017)

04-94 DIAGNOSTICS - ENGINE CONTROL SYSTEM

04 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
to low voltage power and the pulse-width • The fan connector
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

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) 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