TT Coupe L4-1.8L Turbo (ATC) (2001)
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Disconnect connector at Mass Air Flow (MAF) sensor.
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Connect multimeter for voltage measurement as follows.
Harness connector terminal
Measure to
2
Engine Ground
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Operate starter briefly.
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Specification: approx. battery voltage
NOTE: Voltage is supplied to Mass Air Flow (MAF) sensor via Fuel Pump (FP) relay.
If specified value is not obtained:
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Check wire connection from terminal 2 of connector to Fuel Pump (FP) relay via fuse for open circuit and short circuit to Ground.
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Repair open circuit or short circuit if necessary.
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Connect multimeter to terminal 2 and terminal 3 of connector for voltage measurement.
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Operate starter briefly.
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Specification: approx. battery voltage
NOTE: Ground from the ECM is present at terminal 3 of connector.
If specified value is not obtained:
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Check wire connections.
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Connect multimeter to terminal 3 and terminal 4 of connector for voltage measurement.
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Specification: approx. 5 V
If specified value is not obtained:
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Check wire connections.
Check wire connections for Mass Air Flow (MAF) sensor
NOTE: Signal wire is also checked during wire test.
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Connect VAG 1598/31 test box at wiring harness to ECM, do not connect ECM.