 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.
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*
| *: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
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.
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*
| *: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
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
- Turn ignition switch OFF.
- 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
- Improper specification of intake air system parts
Is the inspection result normal?
YES >>GO TO 4. NO >>GO TO 3.
 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.
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*
| *: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
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.
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*
| *: 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 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.
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*
| *: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
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.
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*
| *: 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.
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