Touareg V8-4.2L (BAR) (2007)
Main Relay (Computer/Fuel System): Testing and Inspection
ECM Power Supply Relay, Checking
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Motronic Engine Control Module (ECM) (J623) fuses 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.
Test sequence
-
Remove the Motronic Engine Control Module (ECM) Power Supply Relay (J271).
Checking voltage
-
Using a Multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 30 to Ground (GND).
Specified value: battery voltage.
If the specified value was not obtained:
-
Check the wiring connections from the Battery to the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 30 for an open
circuit or a short circuit.
-
Check the wiring connections for damage, corrosion, loose or broken terminals.
-
If necessary, repair the faulty wiring connection.
If the specified value was obtained: