Page 358 - Foton Workshop Manual - Tunland (AT)

04-212 DIAGNOSTICS - ENGINE CONTROL SYSTEM

DTC inspection
DTC DTC definition Trouble location
conditions
Fuel injector metering
oil rail 1 pressure
sensor circuit
• Oil rail pressure
04 P451 -Voltage is above sensor
normal or shorted to
• When the key • The oil pressure
high voltage power
switch is in ON switch connector is
supply
position, the in poor contact, and
Fuel injector metering diagnosis continues the wiring harness
oil rail 1 pressure to run is broken or
sensor circuit shorted.
P452 -Voltage is below • ECM
normal or shorted to
low voltage power
supply

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 oil rail pressure sensor power supply circuit

(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Disconnect the oil rail pressure sensor connector E04.
(d) Connect the battery negative cable.
(e) Ignition switch: ON.

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