Page 395 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-249

DTC inspection
DTC DTC definition Trouble location
conditions
• When the engine
Engine cooling starts running, if the • Thermostat
system monitor - data coolant temperature • Coolant
valid but below is lower than the 04
P3243 temperature sensor
normal operating calibration and its harness
range - medium temperature, the • ECM
severity level diagnosis continues
to run

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 cooling system monitor?
Is the inspection result normal?
YES>To step 2.

NO>Intermittent trouble exists.

2 . Check the thermostat
(a) Ignition switch: OFF.
(b) Remove the thermostat.
(c) Check whether thermostat can work properly.

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

NO >Replace thermostat.

3 . Check coolant temperature 1 sensor
(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Disconnect the coolant temperature sensor connector E09.

Page 395