Page 445 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-299

P2451- TURBINE INLET TEMPERATURE (CALCULATED VALUE)

OF TURBOCHARGER - DATA IS VALID BUT ABOVE NORMAL
OPERATING RANGE -MEDIUM SEVERITY LEVEL

Description
1 . The variable geometry turbocharge is powered by variable geometry turbocharger 04
actuator.The variable geometry turbocharger actuator is an intelligent device
that receives the information transmitted by the main engine control module
(ECM) via the J1939 data communication interface.The variable geometry
turbocharger performs autonomous diagnosis and reports failure to the main
engine ECM using the J1939 data communication interface.

DTC inspection
DTC DTC definition Trouble location
conditions
urbine inlet
temperature
(calculated value) of • During engine • Turbocharger
turbocharger - data is operation, the
P2451 • Intake system
valid but above diagnosis continues • ECM
normal operating to run
range -medium
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 turbocharger turbine inlet temperature?
Is the inspection result normal?

YES>To step 2.
NO>Intermittent trouble exists.

2 . Check the mechanical system of turbocharger

Page 445