Diagnostic Test

With CONSULT 

1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Start engine and warm it up to normal operating temperature.
4. Connect CONSULT and select "DATA MONITOR" mode.
5. Select "MAS A/F SE-B1" and "MAS A/F SE-B2", and check the indication.

   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.)	0.7 - 1.2
   	2, 500 rpm (Engine is warmed-up to normal operating temperature.)	1.3 - 1.7
   	Idle to about 4, 000 rpm	0.7 - 1.2 to Approx. 2.4*

   * : Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.

Without CONSULT 

1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Start engine and warm it up to normal operating temperature.
4. Check the voltage between ECM harness connector terminals under the following conditions:

   ECM			Condition	Voltage (V)
   Connector	+	-
   	Terminal	Terminal
   F102	77 [MAF sensor (bank 1) signal]	68	Ignition switch ON (Engine stopped.)	Approx. 0.4
   			Idle (Engine is warmed-up to normal operating temperature.)	0.7 - 1.2
   			2, 500 rpm (Engine is warmed-up to normal operating temperature.)	1.3 - 1.7
   			Idle to about 4, 000 rpm	0.7 - 1.2 to Approx. 2.4*
   	79 [MAF sensor (bank 2) signal]	94	Ignition switch ON (Engine stopped.)	Approx. 0.4
   			Idle (Engine is warmed-up to normal operating temperature.)	0.7 - 1.2
   			2, 500 rpm (Engine is warmed-up to normal operating temperature.)	1.3 - 1.7
   			Idle to about 4, 000 rpm	0.7 - 1.2 to Approx. 2.4*

   * : Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.

Is the inspection result normal?

YES 

INSPECTION END

NO 

GO TO STEP 2  .

1. Turn ignition switch OFF.
2. Check for the cause of uneven air flow through mass air flow sensor. Refer to the following:
   • Crushed air ducts
   • Malfunctioning seal of air cleaner element
   • Uneven dirt of air cleaner element
   • Intake valve deposits
   • Improper specification of intake air system parts

Is the inspection result normal?

YES 

GO TO STEP 4  .

NO 

GO TO STEP 3  .

With CONSULT 

1. Repair or replace malfunctioning part.
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 "MAS A/F SE-B2", and check the indication.

   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.)	0.7 - 1.2
   	2, 500 rpm (Engine is warmed-up to normal operating temperature.)	1.3 - 1.7
   	Idle to about 4, 000 rpm	0.7 - 1.2 to Approx. 2.4*

   * : Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.

Without CONSULT 

1. Repair or replace malfunctioning part.
2. Start engine and warm it up to normal operating temperature.
3. Check the voltage between ECM harness connector terminals under the following conditions:

   ECM			Condition	Voltage (V)
   Connector	+	-
   	Terminal	Terminal
   F102	77 [MAF sensor (bank 1) signal]	68	Ignition switch ON (Engine stopped.)	Approx. 0.4
   			Idle (Engine is warmed-up to normal operating temperature.)	0.7 - 1.2
   			2, 500 rpm (Engine is warmed-up to normal operating temperature.)	1.3 - 1.7
   			Idle to about 4, 000 rpm	0.7 - 1.2 to Approx. 2.4*
   	79 [MAF sensor (bank 2) signal]	94	Ignition switch ON (Engine stopped.)	Approx. 0.4
   			Idle (Engine is warmed-up to normal operating temperature.)	0.7 - 1.2
   			2, 500 rpm (Engine is warmed-up to normal operating temperature.)	1.3 - 1.7
   			Idle to about 4, 000 rpm	0.7 - 1.2 to Approx. 2.4*

   * : Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.

Is the inspection result normal?

YES 

INSPECTION END

NO 

GO TO STEP 4  .

With CONSULT 

1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector and reconnect it again.
3. Start engine and warm it up to normal operating temperature.
4. Connect CONSULT and select "DATA MONITOR" mode.
5. Select "MAS A/F SE-B1" and "MAS A/F SE-B2", and check the indication.

   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.)	0.7 - 1.2
   	2, 500 rpm (Engine is warmed-up to normal operating temperature.)	1.3 - 1.7
   	Idle to about 4, 000 rpm	0.7 - 1.2 to Approx. 2.4*

   * : Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.

Without CONSULT 

1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector and reconnect it again.
3. Start engine and warm it up to normal operating temperature.
4. Check the voltage between ECM harness connector terminals under the following conditions:

   ECM			Condition	Voltage (V)
   Connector	+	-
   	Terminal	Terminal
   F102	77 [MAF sensor (bank 1) signal]	68	Ignition switch ON (Engine stopped.)	Approx. 0.4
   			Idle (Engine is warmed-up to normal operating temperature.)	0.7 - 1.2
   			2, 500 rpm (Engine is warmed-up to normal operating temperature.)	1.3 - 1.7
   			Idle to about 4, 000 rpm	0.7 - 1.2 to Approx. 2.4*
   	79 [MAF sensor (bank 2) signal]	94	Ignition switch ON (Engine stopped.)	Approx. 0.4
   			Idle (Engine is warmed-up to normal operating temperature.)	0.7 - 1.2
   			2, 500 rpm (Engine is warmed-up to normal operating temperature.)	1.3 - 1.7
   			Idle to about 4, 000 rpm	0.7 - 1.2 to Approx. 2.4*

   * : Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.

Is the inspection result normal?

YES 

INSPECTION END

NO 

Clean or replace malfunctioning mass air flow sensor. Refer to EXPLODED VIEW WITH TORQUE SPECIFICATIONS .