P0101
P0101 MAF SENSOR
DTC Logic
DTC DETECTION LOGIC
NOTE:
If DTC P0101 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
DTC CONFIRMATION PROCEDURE
1. PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following procedure before conducting 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.
- GO TO 2.
2. PERFORM DTC CONFIRMATION PROCEDURE
1.Start engine and warm it up to normal operating temperature.
2.Drive the vehicle for at least 5 seconds under the following conditions:
CAUTION:
Always drive vehicle at safe speed.
NOTE:
- The gear must be fixed while driving the vehicle.
- Keep the accelerator pedal as steady as possible during cruising.
3.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NO- INSPECTION END
Diagnosis Procedure
1. CHECK INTAKE SYSTEM
Check the following for connection.
- Air duct
- Vacuum hoses
- Intake air passage between air duct and intake manifold
Is the inspection result normal?
YES- GO TO 2.
NO- Reconnect the parts.
2. CHECK MASS AIR FLOW (MAF) SENSOR POWER SUPPLY
1.Disconnect 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 3.
NO- Perform the trouble diagnosis for power supply circuit.
3. CHECK MAF SENSOR GROUND CIRCUIT
1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between MAF sensor harness connector and ECM harness connector.
4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT
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 5.
NO- Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK INTAKE AIR TEMPERATURE SENSOR
Check intake air temperature sensor. Refer to "Component Inspection" .
Is the inspection result normal?
YES- GO TO 6.
NO- Replace MAF sensor (with intake air temperature sensor).
6. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Check EVAP control system pressure sensor. Refer to "Component Inspection" P0451.
Is the inspection result normal?
YES- GO TO 7.
NO- Replace EVAP control system pressure sensor.
7. CHECK MAF SENSOR
Check MAF sensor. Refer to "Component Inspection" .
Is the inspection result normal?
YES- Check intermittent incident. Refer to"Intermittent Incident" Intermittent Incident.
NO- Replace MAF sensor. Refer to "Removal and Installation" Removal And Installation.
Component Inspection
1. CHECK MASS AIR FLOW (MAF) SENSOR-I
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 check the indication.
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.
Is the inspection result normal?
YES- GO TO 4.
NO- GO TO 2.
2. CHECK FOR THE CAUSE OF UNEVEN AIR FLOW THROUGH MAF SENSOR
1.Turn ignition switch OFF.
2.Check for the cause of uneven air flow through MAF 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 MAF SENSOR-II
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 check the indication.
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.
Is the inspection result normal?
YES- INSPECTION END
NO- GO TO 4.
4. CHECK MAF SENSOR-III
With CONSULT
1.Turn ignition switch OFF.
2.Disconnect MAF 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 check the indication.
Without CONSULT
1.Turn ignition switch OFF.
2.Disconnect MAF 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.
Is the inspection result normal?
YES- INSPECTION END
NO- Clean or replace MAF sensor. Refer to "Removal and Installation" Removal And Installation.