Engine Electrical System

DETAILED TABLE OF DIAGNOSTIC TROUBLE CODES
Diagnostic trouble code: P0107 “Undervoltage in circuit of air intake pressure
sensor”
Item
No.
Operation procedure
Inspection
results
Follow-up
procedure
1
Connect the diagnostic tester and adaptor,
and turn the ignition switch to “ON”
position.
Proceed to next
step.
Yes Proceed to Step 5
2
Observe the “air intake pressure” in data
flow and verify that it is maintained at
101kPa (the exact value is determined by
the atmospheric pressure at that time).
No
Proceed to next
step.
Yes Proceed to Step 5
3
Disconnect the connector of the air intake
pressure sensor on the wiring harness and
inspect with multimeter to verify that the
voltage between the 3# and 1# pins of the
connector is about 5V.
No
Proceed to next
step.
Yes
Repair or replace
the wiring
harness. 4
Verify that the circuits between the 17#,
33# and 37# pins of ECU and the 1#, 3#,
and 4# pins of the sensor connector are
short to ground.
No
Proceed to next
step.
Yes
Refer to diagnosis
help.
5
Start up the engine, run at idle speed. Step
on the accelerator pedal slowly until the
nearly full opening, observe the “air intake
pressure” displayed on the diagnostic
tester and verify that the value is stable
without significant change; if step on the
accelerator pedal quickly until nearly full
opening, whether the value exceeds 90kPa
instantaneously.
No
Replace the
sensor.
Yes
Refer to diagnosis
help.
6
Start up the engine, run at idle speed.
Observe the value of “Coolant
temperature” on the diagnostic tester to
verify that the indicated value is increased
along with the temperature increase of the
engine coolant.
No
Replace the
sensor.
E-24
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