Work sequence

Fig 1: 4-Pin Harness Connector And Ignition Coil

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Disconnect 4-pin harness connector -1- at one ignition coil -2-.

Fig 2: 4 Pin Harness Connector & Terminals

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Connect multimeter for voltage measurement as follows.

Harness connector Terminal	Measure to
1	Engine Ground (GND)

Switch ignition on.

Specification: approx. battery voltage

If specified value is not obtained:

Fig 3: Secondary Air Injection Pump Relay J299

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Disconnect voltage supply relay -2- below left cover at bulkhead.

NOTE: To remove the protective hood for the TT Roadster relay carrier, disengage at the bulkhead and swing it downward. Disconnect additional harness connectors at Mass Air Flow (MAF) sensor, if necessary.

Fig 4: Identifying AIR Pump Relay Terminals

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Check following connection for open circuit according to wiring diagram:

Right relay carrier under cover at bulkhead Terminal	Harness connector at ignition coils Terminal
2	1

Repair open circuit if necessary.

If wiring connection is OK:

Check voltage supply of Motronic ECM power supply relay -J271-. Refer to Checking voltage supply .
Check activation of Motronic Engine Control Module (ECM) power supply relay -J271-. Refer to Checking activation .