Page 407 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-261

DTC inspection
DTC DTC definition Trouble location
conditions
• EGR valve position
Exhaust gas sensor
recirculation (EGR) • EGR valve position
valve position - Data sensor connector is 04
P1228
is unstable, in poor contract, the
intermittent or harness is open or
incorrect short circuited.
• ECM

• EGR valve position
sensor
EGR valve position • When the key • The circuit of
sensor connector is harness, joint or
switch is in ON
P2271 out of contact, the sensor is open.
position, the
harness is open or • The signal line is
diagnosis continues
shorted short to the sensor
to run.
power
• ECM

• EGR valve position
sensor
EGR valve position • The circuit of
circuit - voltage is harness, joint or
P2272 above normal or sensor is open.
shorted to high • The signal line is
voltage power supply short to the sensor
power
• ECM

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.

Page 407