P0101

P0101
Mass Air Flow Circuit - Range 1 Performance Problem
Mass Air Flow Sensor Signal implausible

P0102
Mass Air Flow Circuit - Low Input
Mass Air flow Sensor, below lower limit

P0103
Mass Air Flow Circuit - High Input
Mass Air Flow Sensor, above upper limit

Function
The Mass Air Flow Sensor delivers a signal to calculate the intake air mass. The intake air mass is an exact measurement for the load condition of the engine.

Diagnostic conditions
Engine speed is higher than 400 1/min and at least 0,8 seconds after starting the engine.





Wiring Diagram.









Diagnostic procedure.

Check wiring from MAF Sensor to ECM for continuity.
1. Remove MAF Sensor connector.
2. Remove ECM connector.
3. Connect ohmmeter to ECM connector, pin 17 and MAF Sensor connector, pin 2.

- Specified value: 0 - 5 ohms.
- If meter reads infinite resistance, check wiring harness for chafing and pinching damage.

Check wiring from MAF Sensor to ECM for short to ground.
1. Remove MAF Sensor connector.
2. Remove ECM connector.
3. Connect ohmmeter to ECM connector, pin 17 and ground.

- Specified value: infinite resistance
- If meter reads 0 - 5 ohms, check wiring for chafing or pinching damage.

Check wiring from MAF Sensor to ECM for short to B+.
1. Remove MAF Sensor connector.
2. Remove ECM connector.
3. Connect voltmeter to ECM connector, pin 17 (plus) and ground.
4. Switch ignition on.

- Specified value: 0 Volts
- If meter reads battery voltage, check wiring for chafing or pinching damage.