P0101, P010B MAF SENSOR

VR38

P0101 P010B

Description
DTC Logic
Component Function Check
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
P0101	Mass air flow sensor (bank 1) circuit range/performance	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 EVAP control system pressure sensor
P0101	Mass air flow sensor (bank 1) circuit range/performance	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 EVAP control system pressure sensor Intake air temperature sensor
P010B	Mass air flow sensor (bank 2) circuit range/performance	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 EVAP control system pressure sensor
P010B	Mass air flow sensor (bank 2) circuit range/performance	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 EVAP control system pressure sensor Intake air temperature sensor

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

2.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

3.CHECK MASS AIR FLOW SENSOR FUNCTION

4.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

5.PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B

Component Function Check

1.PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B

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 INTAKE AIR TEMPERATURE SENSOR

9.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

10.CHECK MASS AIR FLOW SENSOR

11.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.

ENG SPEED	More than 1,400 rpm
TP SEN 1-B1	More than 1.0 V
TP SEN 2-B1	More than 1.0 V
TP SEN 1-B2	More than 1.0 V
TP SEN 2-B2	More than 1.0 V
Selector lever	Suitable position
Driving location	Driving vehicle uphill (Increased engine load) will help maintain the driving conditions required for this test.

DTC	MAF sensor			Ground	Voltage
	Bank	Connector	Terminal
P0101	1	F15	5	Ground	Battery voltage
P010B	2	F31	5

DTC	MAF sensor			ECM		Continuity
DTC	Bank	Connector	Terminal	Connector	Terminal	Continuity
P0101	1	F15	4	F101	22	Existed
P010B	2	F31	4	F101	19	Existed