Infiniti FX35 / FX45. Manual — part 354
DTC P0101 MAF SENSOR
EC-177
< SERVICE INFORMATION >
[VQ35DE]
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Wiring Diagram
INFOID:0000000001325994
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.
TBWM1381E
EC-178
< SERVICE INFORMATION >
[VQ35DE]
DTC P0101 MAF SENSOR
Diagnosis Procedure
INFOID:0000000001325995
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.
3.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten ground screw on the body. Refer to
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace ground connections.
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
51
L/W
Mass air flow sensor
[Engine is running]
• Warm-up condition
• Idle speed
1.0 - 1.2V
[Engine is running]
• Warm-up condition
• Engine speed: 2,500 rpm
1.6 - 2.0V
67
B/W
Sensor ground
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 0V
111
W/B
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/B
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
PBIB2625E
DTC P0101 MAF SENSOR
EC-179
< SERVICE INFORMATION >
[VQ35DE]
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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 terminal 2 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E211, M41
• Harness connectors M82, F102
• Harness for open or short between IPDM E/R and mass air flow sensor
• 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.
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.
PBIB1565E
Voltage: Battery voltage
PBIB1168E
Continuity should exist.
Continuity should exist.
EC-180
< SERVICE INFORMATION >
[VQ35DE]
DTC P0101 MAF SENSOR
8.
CHECK INTAKE AIR TEMPERATURE SENSOR
EC-192, "Component Inspection"
OK or NG
OK
>> GO TO 9.
NG
>> Replace mass air flow sensor (with intake air temperature sensor).
9.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-373, "Component Inspection"
OK or NG
OK
>> GO TO 10.
NG
>> Replace EVAP control system pressure sensor.
10.
CHECK MASS AIR FLOW SENSOR
EC-180, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> Replace mass air flow sensor.
11.
CHECK INTERMITTENT INCIDENT
>> INSPECTION END
Component Inspection
INFOID:0000000001325996
MASS AIR FLOW SENSOR
With CONSULT-III
1.
Reconnect all harness connectors disconnected.
2.
Start engine and warm it up to normal operating temperature.
3.
Connect CONSULT-III and select “DATA MONITOR” mode.
4.
Select “MAS A/F SE-B1” and check indication under the following conditions.
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
5.
If the voltage is out of specification, proceed the following.
a.
Check for the cause of uneven air flow through mass air flow sensor. Refer to following.
• Crushed air ducts
• Malfunctioning seal of air cleaner element
• Uneven dirt of air cleaner element
• Improper specification of intake air system parts
b.
If NG, repair or replace malfunctioning part and perform step 2 to 4 again.
If OK, go to next step.
6.
Turn ignition switch OFF.
7.
Disconnect mass air flow sensor harness connector and reconnect it again.
8.
Perform step 2 to 4 again.
9.
If NG, clean or replace mass air flow sensor.
Condition
MAS A/F SE-B1 (V)
Ignition switch ON (Engine stopped.)
Approx. 0.4
Idle (Engine is warmed-up to normal
operating temperature.)
1.0 - 1.2
2,500 rpm (Engine is warmed-up to
normal operating temperature.)
1.6 - 2.0
Idle to about 4,000 rpm
1.0 - 1.2 to Approx. 2.4*
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