Infiniti M45 (Y34). Manual — part 372
DTC P0101 MAF SENSOR
EC-177
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EC
Wiring Diagram
ABS002F5
TBWA0271E
EC-178
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
ABS002F6
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)
42
W/B
ECM relay
(Self shut-off)
[Engine is running]
[Ignition switch: OFF]
●
A few seconds after turning ignition switch
OFF
0 - 1.0V
[Ignition switch: OFF]
●
More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
91
B/Y
Mass air flow sensor
[Engine is running]
●
Warm-up condition
●
Idle speed
1.1 - 1.5V
[Engine is running]
●
Warm-up condition
●
Engine speed: 2,500 rpm.
1.7 - 2.4V
103
L
Sensor power supply
[Ignition switch: ON]
Approximately 5V
109
LG
Mass air flow sensor ground
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
163
166
R
R
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
DTC P0101 MAF SENSOR
EC-179
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EC
3.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws.
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 harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between MAF sensor terminals 2, 4 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 M135, F105
●
Harness for open or short between mass air flow sensor and ECM relay
●
Harness for open or short between mass air flow sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB1118E
PBIB1119E
Terminal
Voltage
2
Approximately 5V
4
Battery voltage
PBIB0076E
EC-180
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 109.
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 1 and ECM terminal 91.
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 MASS AIR FLOW SENSOR
Refer to
EC-181, "Component Inspection"
OK or NG
OK
>> GO TO 9.
NG
>> Replace mass air flow sensor.
9.
CHECK INTERMITTENT INCIDENT
Refer to
EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Continuity should exist.
Continuity should exist.
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