Page 363 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-217

DTC inspection
DTC DTC definition Trouble location
conditions
Fuel injector metering
oil rail 1 pressure-
data is valid but
P553
above normal 04
operating range - • Oil rail pressure
medium severity level sensor
• Fuel pump actuator
Fuel injector metering • The oil rail pressure
oil rail 1 pressure- • During engine sensor or fuel pump
data is valid but operation, the
P559 actuator connector
below normal diagnosis continues is in poor contact
operating range - to run and the wiring
medium severity level
harness is broken
Fuel injector metering or shorted
oil rail 1 pressure- • ECM
data is valid but
P1911
above normal
operating range -
highest 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 oil rail pressure sensor?
Is the inspection result normal?

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

2 . Check fuel system

(a) Ignition switch: OFF.
(b) Check whether the fuel system has phenomenon of block, leakage and so on.

Page 363