DTC P0103
1 Check wiring from MAF sensor to DME control module for continuity.
1. Remove connector of MAF sensor.
2. Connect special tool 9637 to wiring harness (DME control module connector).
3. Connect ohmmeter to special tool 9637, pin III/23, and MAF sensor connector, pin 5.
Display: 0 - 5 ohms
If infinity ohms is displayed, check wiring harness for chafing and pinching damage.
2 Check wiring from MAF sensor to DME control module for short to ground.
1. Remove connector of MAF sensor.
2. Connect special tool 9637 to wiring harness (DME control module connector).
3. Connect ohmmeter to special tool 9637, pin III/23, and ground.
Display: infinity ohms
If 0 - 5 ohms is displayed, check wiring harness for chafing and pinching damage.
3 Check signal from MAF sensor.
1. Check voltage signal from MAF sensor with "Ignition on" (with Porsche System Tester 2 in the Actual values/mass air flow menu, or with a
voltmeter and special tool 9637).
Nominal value: 0.9 to 1.1 V