Nissan Maxima. Manual — part 426
EC-188
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0101 MAF SENSOR
YES
>> INSPECTION END
NO
>> Clean or replace mass air flow sensor. Refer to
P0102, P0103 MAF SENSOR
EC-189
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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P0102, P0103 MAF SENSOR
Description
INFOID:0000000010094891
The mass air flow sensor (1) is placed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. The mass air flow sensor controls the temperature of the
hot wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The greater air flow, the
greater the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.
DTC Logic
INFOID:0000000010094892
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
Which DTC is detected?
P0102 >> GO TO 2.
P0103 >> GO TO 3.
2.
PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0102
1. Start engine and wait at least 5 seconds.
2. Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
3.
PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0103-I
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0103-II
1. Start engine and wait at least 5 seconds.
2. Check DTC.
PBIA9559J
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P0102
Mass air flow sensor
circuit low input
An excessively low voltage from the sensor is sent
to ECM.
• Harness or connectors
(The sensor circuit is open or shorted.)
• Intake air leakage
• Mass air flow sensor
P0103
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
EC-190
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0102, P0103 MAF SENSOR
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010094893
Regarding Wiring Diagram information, refer to
.
1.
INSPECTION START
Confirm the detected DTC.
Which DTC is detected?
P0102 >> GO TO 2.
P0103 >> GO TO 3.
2.
CHECK INTAKE SYSTEM
Check the following for connection.
• Air duct
• Vacuum hoses
• Intake air passage between air duct to intake manifold
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Reconnect the parts.
3.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace ground connection.
4.
CHECK MAF SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow (MAF) sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between MAF sensor harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E11, F2
• Junction block connectors E44, E45
• 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, 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 the continuity between MAF sensor harness connector and ECM harness connector.
MAF sensor
Ground
Voltage
Connector
Terminal
F31
2
Ground
Battery voltage
PBIB1168E
P0102, P0103 MAF SENSOR
EC-191
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
7.
CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between MAF sensor harness connector and ECM harness connector.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
8.
CHECK MASS AIR FLOW SENSOR
EC-191, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Replace mass air flow sensor. Refer to
EM-24, "Removal and Installation"
.
9.
CHECK INTERMITTENT INCIDENT
GI-41, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000010094894
1.
CHECK MASS AIR FLOW SENSOR-I
With CONSULT
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Connect CONSULT 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.
Without CONSULT
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
MAF sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
F31
3
F13
56
Existed
MAF sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
F31
4
F13
58
Existed
Monitor item
Condition
MAS A/F SE-B1 (V)
MAS A/F SE-B1
Ignition switch ON (Engine stopped.)
Approx. 0.4
Idle (Engine is warmed-up to normal operating temperature.)
0.9 - 1.2
2,500 rpm (Engine is warmed-up to normal operating temperature.)
1.6 - 1.9
Idle to about 4,000 rpm
0.9 - 1.2 to Approx. 2.4*
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