Page 403 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-257

DTC inspection
DTC DTC definition Trouble location
conditions
Turbocharger 1
compressor inlet
temperature circuit
• Intake mass flow
P691 -Voltage is above 04
normal or shorted to sensor
• When the key • The inlet mass flow
high voltage power
switch is in ON sensor connector is
supply
position, the in poor contact and
Turbocharger 1 diagnosis continues the wiring harness
compressor inlet to run. is broken or
temperature circuit shorted.
P692 -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 turbocharger 1 compressor inlet
temperature circuit?

Is the inspection result normal?

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

2 . Check turbocharger 1 compressor inlet temperature circuit

(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Disconnect intake mass flow sensor connector E07.
(d) Connect the battery negative cable.
(e) Ignition switch: ON.

Page 403