TTS Quattro Roadster L4-2.0L Turbo (CDMA) (2009)
Main Relay (Computer/Fuel System): Testing and Inspection
Engine Component Power Supply Relay, Checking
Engine Component Power Supply Relay, Checking
Special tools, testers and auxiliary items required
‹› multimeter.
‹› Wiring diagram.
Test requirements
‹› Fuse (SB5) OK.
‹› Fuse (SB7) OK.
‹› Motronic Engine Control Module (ECM) Power Supply Relay (J271) OK
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, selector lever in position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Ignition switched off.
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Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check.
Start diagnosis
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Using a multimeter, check the following wiring connection for voltage.
Specified value: 12.5 V
If the specified value was not obtained:
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Using a multimeter, check the Engine Component Power Supply Relay (J757) socket 1/30 to the Generator (GEN) (C) B (+) terminal 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:
Checking activation
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Switch the ignition on.
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Using a multimeter, check the following wiring connection for voltage.