Page 301 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-155

DTC inspection
DTC DTC definition Trouble location
conditions
Engine coolant
temperature 1 sensor
circuit voltage is
P144
above normal or short 04
circuit to high voltage
• Engine coolant
power supply
temperature 1
Engine coolant sensor circuit
temperature 1 sensor voltage is higher
circuit voltage is than normal or
P145
below normal or short short circuit to high
• When the key
circuit to low voltage voltage power
power supply switch is in ON supply
position, the
Engine coolant diagnosis continues • The circuit of the
temperature data is to run. wiring harness,
valid but above connector or sensor
P151 is open
normal operating
• The signal circuit is
range - highest
severity level open or shorted to
the power supply.
Engine coolant
• ECM
temperature data is
valid but above
P2963
normal operating
range - lowest
severity level

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 engine coolant 1 temperature sensor?

Is the inspection result normal?

Page 301