Infiniti M45 (Y34). Manual — part 371
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-173
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EC
Component Inspection
ABS002EY
HEATED OXYGEN SENSOR 2 HEATER
1.
Check resistance between HO2S2 terminals as follows.
2.
If NG, replace heated oxygen sensor 2.
CAUTION:
●
Discard any heated oxygen sensor which has been dropped
from a height of more than 0.5 m (19.7 in) onto a hard sur-
face such as a concrete floor; use a new one.
●
Before installing new oxygen sensor, clean exhaust system
threads using Oxygen Sensor Thread Cleaner tool J-43897-
18 or J-43897-12 and approved anti-seize lubricant.
Removal and Installation
ABS002EZ
HEATED OXYGEN SENSOR 2
Refer to
EM-22, "EXHAUST MANIFOLD AND THREE WAY CATALYST"
Terminal No.
Resistance
2 and 3
5.0 - 7.0
Ω
[at 25
°
C (77
°
F)]
1 and 2, 3, 4
∞
Ω
(Continuity should not exist)
4 and 1, 2, 3
SEF249Y
EC-174
DTC P0101 MAF SENSOR
DTC P0101 MAF SENSOR
PFP:22680
Component Description
ABS002F0
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
ABS002F1
Specification data are reference values.
On Board Diagnosis Logic
ABS002F2
NOTE:
If DTC P0101 is displayed with DTC P1229, first perform the trouble diagnosis for DTC P1229.
Refer to
This self-diagnosis has the one trip detection logic.
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
P0101
0101
Mass air flow sensor cir-
cuit range/performance
problem
A)
A high voltage from the sensor is sent to ECM
under light load driving condition.
●
Harness or connectors
(The sensor circuit is open or
shorted.)
●
Mass air flow sensor
B)
A low voltage from the sensor is sent to ECM
under heavy load driving condition.
●
Harness or connectors
(The sensor circuit is open or
shorted.)
●
Intake air leaks
●
Mass air flow sensor
DTC P0101 MAF SENSOR
EC-175
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EC
DTC Confirmation Procedure
ABS002F3
Perform PROCEDURE FOR MALFUNCTION A first.
If DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.
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 MALFUNCTION A
NOTE:
If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead
of running engine at idle speed.
With CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and warm it up to normal operating temperature.
4.
Run engine for at least 10 seconds at idle speed.
5.
EC-178, "Diagnostic Procedure"
.
With GST
Follow the procedure With CONSULT-II above.
PROCEDURE FOR MALFUNCTION B
CAUTION:
Always drive vehicle at a safe speed.
With CONSULT-II
1.
Turn ignition switch ON.
2.
Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to
EC-178, "Diagnostic Procedure"
.
3.
Select “DATA MONITOR” mode with CONSULT-II.
4.
Check the voltage of “MAS A/F SE-B1” with “DATA MONITOR”.
5.
Increases engine speed to about 4,000 rpm.
6.
Monitor the linear voltage rise in response to engine speed
increases.
If NG, go to
EC-178, "Diagnostic Procedure"
If OK, go to following step.
SEF174Y
SEF243Y
EC-176
DTC P0101 MAF SENSOR
7.
Maintain the following conditions for at least 10 consecutive sec-
onds.
8.
If DTC is detected, go to
EC-178, "Diagnostic Procedure"
.
Overall Function Check
ABS002F4
PROCEDURE FOR MALFUNCTION B
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
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
EC-178, "Diagnostic Procedure"
ENG SPEED
More than 2,000 rpm
THRTL SEN 1
More than 3V
THRTL SEN 2
More than 3V
Selector lever
Suitable position
Driving location
Driving vehicle uphill (Increased engine load) will help
maintain the driving conditions required for this test.
PBIB0199E
SEF534P
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