Infiniti QX4 (R50). Manual — part 173
Possible Cause
NBEC0728
I
Harness or connectors
(Absolute pressure sensor circuit is open or shorted.)
I
Absolute pressure sensor
DTC Confirmation Procedure
NBEC0729
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
SEF058Y
WITH CONSULT-II
NBEC0729S01
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Wait at least 10 seconds.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-161.
WITH GST
NBEC0729S02
Follow the procedure “WITH CONSULT-II” above.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0105 ABSOLUTE PRESSURE SENSOR
Possible Cause
EC-159
Wiring Diagram
=NBEC0730
MEC943C
DTC P0105 ABSOLUTE PRESSURE SENSOR
Wiring Diagram
EC-160
Diagnostic Procedure
NBEC0731
1
RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
SEF959Y
©
GO TO 2.
2
CHECK ABSOLUTE PRESSURE SENSOR CONNECTOR FOR WATER
1. Disconnect absolute pressure sensor harness connector.
SEF961Y
2. Check sensor harness connector for water.
Water should not exist.
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace harness connector.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0105 ABSOLUTE PRESSURE SENSOR
Diagnostic Procedure
EC-161
3
CHECK ABSOLUTE PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “ON”.
2. Check voltage between absolute pressure sensor terminal 1 and ground with CONSULT-II or tester.
SEF299X
OK or NG
OK
©
GO TO 4.
NG
©
Repair harness or connectors.
4
CHECK ABSOLUTE PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between absolute pressure sensor terminal 3 and engine ground.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 5.
5
DETECT MALFUNCTIONING PART
Check the following.
I
Harness for open or short between ECM and absolute pressure sensor
I
Harness for open or short between TCM (Transmission Control Module) and absolute pressure sensor
©
Repair open circuit or short to ground or short to power in harness or connectors.
6
CHECK ABSOLUTE PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 80 and absolute pressure sensor terminal 2.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 7.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
DTC P0105 ABSOLUTE PRESSURE SENSOR
Diagnostic Procedure (Cont’d)
EC-162
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