24-64
Voltage supply for Mass Air Flow (MAF)
sensor, checking
Test requirements:
Fuse for Mass Air Flow (MAF) sensor OK
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
Fuel Pump (FP) relay OK; checking Page 24
-52
.
Note:
Voltage is supplied to Mass Air Flow (MAF)
sensor from Fuel Pump (FP) relay.
- Disconnect connector from Mass Air Flow (MAF)
sensor.
- Connect multimeter for voltage measurement as follows.Harness connector
Terminal
Measure to
2 Engine Ground (GND)
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24-67
Check wire connections for Mass Air Flow
(MF) sensor
Note:
Signal wire is also checked during wire test.
- Connect VAG1598/31 test box at wiring harness
to Engine Control Module (ECM), do not connect
ECM Page 24
-19
.
If wire connection is OK: - Check the following wire connections for open circuit and short circuit
to Ground (GND) and B+: Harness connector
Terminal
VAG1598/31 test box
Socket
3 27
4 53
5 29
- Repair open circuit or short circuit if necessary.
- Also check all wires for short circuit to each other.
- Replace Mass Air Flow (MAF) sensor -G70-.
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