Infiniti M45 (Y34). Manual — part 373
DTC P0101 MAF SENSOR
EC-181
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Component Inspection
ABS002F7
MASS AIR FLOW SENSOR
1.
Reconnect all harness connectors disconnected.
2.
Start engine and warm it up to normal operating temperature.
3.
Check voltage between ECM terminal 91 (Mass air flow sensor
signal) and ground.
*: Make sure linear voltage rises as engine speed increase to about 4,000 rpm.
4.
If the voltage is out of specification, proceed the following.
●
Turn ignition switch OFF.
●
Disconnect mass air flow sensor harness connector and reconnect it again.
●
Perform steps 2 and 3 again.
5.
If NG, remove mass air flow sensor from air duct. Check hot film for damage or dust.
6.
If NG, clean or replace mass air flow sensor.
Removal and Installation
ABS002F8
MASS AIR FLOW SENSOR
Refer to
EM-16, "AIR CLEANER AND AIR DUCT"
.
Condition
Voltage V
Ignition switch: ON (Engine stopped.)
Approx. 1.0
Idle (Engine is warmed-up to normal
operating temperature.)
1.1 - 1.5
2,500 rpm (Engine is warmed-up to
normal operating temperature.)
1.7 - 2.4
Idle to about 4,000 rpm*
1.1 - 1.5 to Approx. 4.0
PBIB0078E
EC-182
DTC P0102, P0103 MAF SENSOR
DTC P0102, P0103 MAF SENSOR
PFP:22680
Component Description
ABS002F9
The mass air flow sensor is placed in the stream of intake air. It mea-
sures the intake flow rate by measuring a part of the entire intake
flow. It consists of a hot film that is supplied with electric current from
the ECM. The temperature of the hot film is controlled by the ECM a
certain amount. The heat generated by the hot film is reduced as the
intake air flows around it. The more air, the greater the heat loss.
Therefore, the ECM must supply more electric current to maintain
the temperature of the hot film as air flow increases. The ECM
detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor Mode
ABS002FA
Specification data are reference values.
On Board Diagnosis Logic
ABS002FB
NOTE:
If DTC P0102, P0103 is displayed with DTC P1229, first perform the trouble diagnosis for DTC P1229.
Refer to
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
SEC266C
MONITOR ITEM
CONDITION
SPECIFICATION
MAS A/F SE-B1
See
EC-128, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"
CAL/LD VALUE
●
Engine: After warming up
●
Selector lever: P or N
●
Air conditioner switch: OFF
●
No load
Idle
15% - 35%
2,500 rpm
10% - 35%
MASS AIRFLOW
●
Engine: After warming up
●
Selector lever: P or N
●
Air conditioner switch: OFF
●
No load
Idle
3.8 - 5.2 g·m/s
2,500 rpm
16.0 - 21.5 g·m/s
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0102
0102
Mass air flow sensor circuit
low input
An excessively low voltage from the sensor is
sent to ECM when engine is running.
●
Harness or connectors
(The sensor circuit is open or shorted.)
●
Intake air leaks
●
Mass air flow sensor
P0103
0103
Mass air flow sensor circuit
high input
An excessively high voltage from the sensor is
sent to ECM.
●
Harness or connectors
(The sensor circuit is open or shorted.)
●
Mass air flow sensor
Detected items
Engine operating condition in fail-safe mode
Mass air flow sensor circuit
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
DTC P0102, P0103 MAF SENSOR
EC-183
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EC
DTC Confirmation Procedure
ABS002FC
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.
PROCEDURE FOR DTC P0102
With CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and wait at least 5 seconds.
4.
EC-185, "Diagnostic Procedure"
.
With GST
Follow the procedure With CONSULT-II above.
PROCEDURE FOR DTC P0103
With CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Wait at least 5 seconds.
4.
EC-185, "Diagnostic Procedure"
.
If DTC is not detected, go to next step.
5.
Start engine and wait at least 5 seconds.
6.
EC-185, "Diagnostic Procedure"
.
With GST
Follow the procedure With CONSULT-II above.
SEF058Y
SEF058Y
EC-184
DTC P0102, P0103 MAF SENSOR
Wiring Diagram
ABS002FD
TBWA0271E
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