Page 481 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-335

DTC inspection
DTC DTC definition Trouble location
conditions
• When the engine
runs and instructs
• EGR system
Engine EGR system the EGR stream, • Intake mass flow
- data is valid but the diagnosis sensor and its 04
P3382 below normal continues to run. harness
operating range - Use INSITE™ • Intake system
medium severity level electronic service
tool to monitor EGR • ECM
valve position.

• When the engine
runs and doesn't • EGR system
instructs the EGR • Intake mass flow
Engine EGR system stream, the sensor and its
- data is valid but
diagnosis continues harness
P3383 above normal to run. Use • Intake throttle
operating range -
INSITE™ electronic actuator
medium severity level
service tool to • Intake system
monitor EGR valve • ECM
position.

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 EGR valve faulty circuit?

Is the inspection result normal?

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

2 . Check the mechanical system of the engine
(a) Check whether there is a leak or obstruction in the EGR flow line.

Page 481