Page 384 - Foton Workshop Manual - Tunland (AT)

04-238 DIAGNOSTICS - ENGINE CONTROL SYSTEM

DTC inspection
DTC DTC definition Trouble location
conditions
Accelerator pedal or
lever position sensor
P1242 1 and 2 - the data is • Intake manifold
04 unstable, intermittent pressure sensor
or incorrect • The circuit in

Sensor power 4 • When the key engine harness,
circuit - voltage is switch is in ON joint or sensor is
P2185 above normal or position, the open.
shorted to high diagnosis continues • The signal wire is
voltage power supply to run short to the sensor
power or battery
Sensor power 4
voltage
circuit - voltage is
• ECM
P2186 below 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 accelerator pedal or lever position sensor
?

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

2 . Check accelerator pedal or lever position sensor power supply circuit
(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Disconnect the connector A026 of accelerator pedal or lever position sensor.
(d) Connect the battery negative cable.

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