P0102, P0103, P010C, P010D MAF SENSOR

VR38

P0102 P0103 P010C P010D

Description
DTC Logic
Diagnosis Procedure
Component Inspection

Description

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 more air, 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

DTC DETECTION LOGIC

DTC No.	Trouble diagnosis name	DTC detecting condition	Possible cause
P0102	Mass air flow sensor (bank 1) 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 leaks Mass air flow sensor
P0103	Mass air flow sensor (bank 1) 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
P010C	Mass air flow sensor (bank 2) 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 leaks Mass air flow sensor
P010D	Mass air flow sensor (bank 2) 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

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

2.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0102 and P010C

3.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0103 and P010D-I

4.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0103 and P010D-II

Diagnosis Procedure

1.INSPECTION START

2.CHECK INTAKE SYSTEM

3.CHECK GROUND CONNECTION

4.CHECK MAF SENSOR POWER SUPPLY CIRCUIT

5.DETECT MALFUNCTIONING PART

6.CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

7.CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

8.CHECK MASS AIR FLOW SENSOR

9.CHECK INTERMITTENT INCIDENT

Component Inspection

1.CHECK MASS AIR FLOW SENSOR-I

With CONSULT-III

Turn ignition switch OFF.
Reconnect all harness connectors disconnected.
Start engine and warm it up to normal operating temperature.
Connect CONSULT-III and select “DATA MONITOR” mode.

Select “MAS A/F SE-B1” and “MAS A/F SE-B2”, and check the indication.

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Monitor item	Condition	Indication (V)
MAS A/F SE-B1 MAS A/F SE-B2	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.)	1.4 - 1.8
	Idle to about 4,000 rpm	0.9 - 1.2 to Approx. 2.4*

Without CONSULT-III

Turn ignition switch OFF.
Reconnect all harness connectors disconnected.
Start engine and warm it up to normal operating temperature.

Check the voltage between ECM harness connector terminals under the following conditions.

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
ECM			Condition	Voltage (V)
Connector	+	–
	Terminal	Terminal
F101	47 [MAF sensor (bank 1) signal]	22	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.)	1.4 - 1.8
			Idle to about 4,000 rpm	0.9 - 1.2 to Approx. 2.4*
	31 [MAF sensor (bank 2) signal]	19	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.)	1.4 - 1.8
			Idle to about 4,000 rpm	0.9 - 1.2 to Approx. 2.4*

Is the inspection result normal?

YES>>GO TO 4.

NO>>GO TO 2.

2.CHECK FOR THE CAUSE OF UNEVEN AIR FLOW THROUGH MASS AIR FLOW SENSOR

3.CHECK MASS AIR FLOW SENSOR-II

With CONSULT-III

Repair or replace malfunctioning part.
Start engine and warm it up to normal operating temperature.
Connect CONSULT-III and select “DATA MONITOR” mode.

Select “MAS A/F SE-B1” and “MAS A/F SE-B2”, and check the indication.

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Monitor item	Condition	Indication (V)
MAS A/F SE-B1 MAS A/F SE-B2	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.)	1.4 - 1.8
	Idle to about 4,000 rpm	0.9 - 1.2 to Approx. 2.4*

Without CONSULT-III

Repair or replace malfunctioning part.
Start engine and warm it up to normal operating temperature.

Check the voltage between ECM harness connector terminals under the following conditions.

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
ECM			Condition	Voltage (V)
Connector	+	–
	Terminal	Terminal
F101	47 [MAF sensor (bank 1) signal]	22	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.)	1.4 - 1.8
			Idle to about 4,000 rpm	0.9 - 1.2 to Approx. 2.4*
	31 [MAF sensor (bank 2) signal]	19	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.)	1.4 - 1.8
			Idle to about 4,000 rpm	0.9 - 1.2 to Approx. 2.4*

Is the inspection result normal?

YES>>INSPECTION END

NO>>GO TO 4.

4.CHECK MASS AIR FLOW SENSOR-III

With CONSULT-III

Turn ignition switch OFF.
Disconnect mass air flow sensor harness connector and reconnect it again.
Start engine and warm it up to normal operating temperature.
Connect CONSULT-III and select “DATA MONITOR” mode.

Select “MAS A/F SE-B1” and “MAS A/F SE-B2”, and check the indication.

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Monitor item	Condition	Indication (V)
MAS A/F SE-B1 MAS A/F SE-B2	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.)	1.4 - 1.8
	Idle to about 4,000 rpm	0.9 - 1.2 to Approx. 2.4*

Without CONSULT-III

Turn ignition switch OFF.
Disconnect mass air flow sensor harness connector and reconnect it again.
Start engine and warm it up to normal operating temperature.

Check the voltage between ECM harness connector terminals under the following conditions.

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
ECM			Condition	Voltage (V)
Connector	+	–
	Terminal	Terminal
F101	47 [MAF sensor (bank 1) signal]	22	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.)	1.4 - 1.8
			Idle to about 4,000 rpm	0.9 - 1.2 to Approx. 2.4*
	31 [MAF sensor (bank 2) signal]	19	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.)	1.4 - 1.8
			Idle to about 4,000 rpm	0.9 - 1.2 to Approx. 2.4*

Is the inspection result normal?

YES>>INSPECTION END

NO>>Clean or replace malfunctioning mass air flow sensor.

DTC	MAF sensor			Ground	Voltage
	Bank	Connector	Terminal
P0102, P0103	1	F15	5	Ground	Battery voltage
P010C, P010D	2	F31	5

DTC	MAF sensor			ECM		Continuity
DTC	Bank	Connector	Terminal	Connector	Terminal	Continuity
P0102, P0103	1	F15	4	F101	22	Existed
P010C, P010D	2	F31	4	F101	19	Existed