Infiniti M35/M45 Y50. Manual — part 609
DTC P0101 MAF SENSOR
EC-909
[VK45DE]
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Wiring Diagram
NBS005CA
TBWT1016E
EC-910
[VK45DE]
DTC P0101 MAF SENSOR
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic Procedure
NBS005CB
1.
INSPECTION START
Which malfunction (A or B) is duplicated?
A or B
A
>> GO TO 3.
B
>> GO TO 2.
2.
CHECK INTAKE SYSTEM
Check the following for connection.
●
Air duct
●
Vacuum hoses
●
Intake air passage between air duct and intake manifold
OK or NG
OK
>> GO TO 3.
NG
>> Reconnect the parts.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
51
W
Mass air flow sensor
[Engine is running]
●
Warm-up condition
●
Idle speed
0.9 - 1.2V
[Engine is running]
●
Warm-up condition
●
Engine speed: 2,500 rpm
1.6 - 1.9V
67
B/W
Sensor ground
(MAF sensor)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
111
SB
ECM relay
(Self shut-off)
[Engine is running]
[Ignition switch: OFF]
●
For a few seconds after turning ignition
switch OFF
0 - 1.5V
[Ignition switch: OFF]
●
More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
119
120
R
R
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
DTC P0101 MAF SENSOR
EC-911
[VK45DE]
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3.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten ground screws on the body.
Refer to
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace ground connections.
4.
CHECK MAF SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect mass air flow (MAF) sensor (1) harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between MAF sensor terminal 2 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E108, M15
●
Harness connectors M72, F102
●
Harness for open or short between mass air flow sensor and ECM
●
Harness for open or short between mass air flow sensor and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
1.
Body ground M70
2.
Body ground M16
PBIB2782E
PBIB2682E
Voltage: Battery voltage
PBIB1168E
EC-912
[VK45DE]
DTC P0101 MAF SENSOR
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 67.
Refer to Wiring Diagram.
4.
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.
7.
CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between MAF sensor terminal 4 and ECM terminal 51.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to
EC-925, "Component Inspection"
OK or NG
OK
>> GO TO 9.
NG
>> Replace intake air temperature sensor.
9.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to
EC-1138, "Component Inspection"
.
OK or NG
OK
>> GO TO 10.
NG
>> Replace EVAP control system pressure sensor.
10.
CHECK MASS AIR FLOW SENSOR
Refer to
EC-913, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> Replace mass air flow sensor.
11.
CHECK INTERMITTENT INCIDENT
Refer to
EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Continuity should exist.
Continuity should exist.
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