Infiniti I35 (A33). Manual — part 212
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SEF534P
Overall Function Check
NHEC0845
PROCEDURE FOR MALFUNCTION B
NHEC0845S01
Use this procedure to check the overall function of the mass air flow
sensor circuit. During this check, a DTC might not be confirmed.
With GST
NHEC0845S0101
1)
Start engine and warm it up to normal operating temperature.
2)
Select “MODE 1” with GST.
3)
Check the mass air flow sensor signal with “MODE 1”.
4)
Check for linear mass air flow sensor signal value rise in
response to increases to about 4,000 rpm in engine speed.
5)
If NG, go to “Diagnostic Procedure”, EC-191.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0101 MAF SENSOR
Overall Function Check
EC-189
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Wiring Diagram
NHEC0846
MEC531D
SEF650XE
DTC P0101 MAF SENSOR
Wiring Diagram
EC-190
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Diagnostic Procedure
NHEC0847
1
INSPECTION START
Which malfunction (A, B) is duplicated?
MTBL1142
Type I or Type II
Type I
©
GO TO 3.
Type II
©
GO TO 2.
2
CHECK INTAKE SYSTEM
Check the following for connection.
I
Air duct
I
Vacuum hoses
I
Intake air passage between air duct to intake manifold collector
OK or NG
OK
©
GO TO 3.
NG
©
Reconnect the parts.
3
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two engine ground screws.
Refer to “Ground Inspection”, EC-160.
SEC047D
OK or NG
OK
©
GO TO 4.
NG
©
Repair or replace ground connections.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0101 MAF SENSOR
Diagnostic Procedure
EC-191
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4
CHECK MAF SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow (MAF) sensor harness connector.
SEC055D
2. Turn ignition switch ON.
3. Check voltage between MAF sensor terminals 2, 4 and ground with CONSULT-II or tester.
SEF297X
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 5.
5
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors E15, F18
I
Harness for open or short between ECM relay and mass air flow sensor
I
Harness for open or short between mass air flow sensor and ECM
©
Repair harness or connectors.
6
CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between MAF sensor terminal 3 and ECM terminal 80.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to power.
OK or NG
OK
©
GO TO 7.
NG
©
Repair open circuit or short to power in harness or connectors.
DTC P0101 MAF SENSOR
Diagnostic Procedure (Cont’d)
EC-192
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