TT Quattro Coupe V6-3.2L (BHE) (2005)
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Main Relay (Computer/Fuel System): Testing and Inspection
Engine Control Module Power Supply Relay, Checking
Special tools, testers and auxiliary items required
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Multimeter.
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wiring diagrams.
Test requirements
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The Motronic Engine Control Module (ECM) J220 fuses OK.
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Fuse S 132 OK.
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Fuse S 134 OK.
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Fuse S237 OK.
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The Ground (GND) connections at the engine and transmission OK.
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The battery voltage at least 12.5 V.
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The generator OK.
Test procedure
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Perform a preliminary check to verify the customers complaint. See: Testing and Inspection/Scan Tool Testing and Procedures/General Diagnosis
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Start diagnosis
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Using a Multimeter, check the following wiring connection for voltage.
Motronic Engine Control
Measure to
Module (ECM) Power Supply
Relay J271 socket
1/30
Engine Ground (GND)
specified value: 12.5 V
If the specified value was not obtained:
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Check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 1/30 to the Battery A for an open circuit or short to Ground
(GND).
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Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
-
Using a Multimeter, check the following wiring connection for voltage.
Motronic Engine Control
Measure to
Module (ECM) Power Supply
Relay J271 socket
3/86
Engine Ground (GND)
specified value: 12.5 V
If the specified value was not obtained:
-
Check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 3/86 to Battery A (+) for an open circuit or short to Ground
(GND).
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Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
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Checking Ground (GND)
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If the manufacturers test box is being used. Perform the following step.
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Install the Adapter Cable (121 -pin) VAG1598/31.
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If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) J220.
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Using a Multimeter, check the following wiring connection for resistance.
Motronic Engine Control
Motronic Engine Control Module
Module (ECM) Power Supply
(ECM) J220 electrical harness
Relay J271 socket
connector T121 or test box socket
5/85
23
specified value: 1.5 Ohms
