Motronic ECM Power supply relay -J271-, checking: Notes

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Special Tools - Motronic ECM Power Supply Relay -J271-, Checking

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Special tools and workshop equipment required

V.A.G 1526 A Multimeter
V.A.G 1594 A Connector test kit
V.A.G 1598/31 Test box

NOTE: The Motronic ECM power supply relay -J271- supplies the ignition coils with output stages as well as the ECM on Pin 121 with power.

Work sequence

Fig 2: Removing Engine Cover

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Remove engine cover (arrows).

Fig 3: Disconnecting 4-Pin Connector From Ignition Coil

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Disconnect 4-pin connector -1- from ignition coil -2-.

Fig 4: Identifying Connector Terminals 1 And 4

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Connect multimeter as follows to measure voltage.

Connector Terminal	Measure to
1	Engine ground (GND)

Switch ignition on.

Specified value: approx. battery voltage (B+)

If specified value is not obtained:

Switch ignition off.

Fig 5: Identifying Plenum Chamber Cover & Removing Rubber Seal

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Remove rubber seal of plenum chamber cover in direction of (arrow).
Remove plenum chamber cover -1- from front.

Fig 6: Removing Securing Clips And Cowl

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Pry off both trim caps -3- with a screwdriver.
Loosen hex nuts -4- several turns.
Release wiper arms -2- from pivot shaft by tilting them slightly.
Remove hex nuts completely and remove wiper arms.

Remove retaining clips -1- and remove air cowl grille -5-.

Fig 7: Removing Screws And Cover From E-Box In Plenum Chamber

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Remove cover for electronics box (plenum chamber) -arrows-.

Fig 8: Using Screwdriver To Remove Retainer Bar And Engine Control Module (ECM) J623

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Lift off ECM retaining clip using a screwdriver (arrow) and move module to side.
If installed, unclip Transmission Control Module (TCM) retaining clip and move module to one side.

Fig 9: Component Location For Secondary Air Injection (AIR) Pump Relay J299

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Disconnect power supply relay -3-.

Fig 10: Identifying Secondary Air Pump Relay Terminals

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Check for open circuit in following wiring according to wiring diagram:

Relay carrier in electronics box, plenum chamber, position 2 Terminal	Connection of ignition coils Terminal
8	1

Repair open circuit, if necessary.

If the wiring is OK:

Check voltage supply of Motronic ECM power supply relay -J271-. Refer to Checking power supply .
Check activation of Motronic ECM power supply relay -J271-. Refer to Checking activation .