TT Coupe L4-1.8L Turbo (ATC) (2001)
If specified value is not obtained:
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Replace engine speed sensor.
If the specified value is met:
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Connect multimeter to terminal 2 and 1 (Ground) as well as to terminal 3 and 1 (Ground) for resistance measurement.
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Specified value: in each case Infinity ohm (no continuity)
If specified value is not obtained:
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Replace engine speed sensor.
If the specified value is met:
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Connect test box V.A.G 1598/31 at wiring harness to engine control module, the engine control module is not to be connected.
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Check the following wire connections for open circuit and short circuit between Ground and B+:
Harness connector Terminal
V.A.G 1598/01 socket
1 (shielded)
108
2 (Ground)
90
3 (Signal)
82
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Repair open circuit or short circuit if necessary.
If no malfunctions are found in wires:
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Replace engine control module.