Page 298 - Foton Workshop Manual - Tunland (AT)

04-152 DIAGNOSTICS - ENGINE CONTROL SYSTEM

DTC inspection
DTC DTC definition Trouble location
conditions
Engine oil rail
pressure - data is
valid but below
P143
04 normal operating
range - medium • Oil pressure switch
severity level • The oil pressure
• When the key
Engine oil rail switch connector is
switch is in ON
pressure - data is i poor contact, and
position, the
valid but below the wiring harness
P415 diagnosis continues
normal operating is broken or
to run.
range - highest shorted.
severity level • ECM

Engine oil rail
pressure - data is
P435
unstable, intermittent
or incorrect

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 a fault code related to oil pressure switch?

Is the inspection result normal?
YES>To step 2.
NO>Intermittent trouble exists.

2 . Check oil pressure switch harness
(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Disconnect the oil pressure switch connector E10.
(d) Disconnect connector E01 of ECM.

Page 298