Jetta Sedan L5-2.5L (CBTA) (2009)
Engine Control Module: Testing and Inspection
Voltage Supply, Checking
Voltage Supply, 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 procedure
-
Perform a preliminary check to verify the customers complaint. Refer to --> [ Preliminary Check ] See: Computers and Control Systems/Testing
and Inspection/Scan Tool Testing and Procedures/Preliminary Check
Start diagnosis
-
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 Box socket 1 (for relay terminal 30) to Ground
(GND).
Specified value: battery voltage.
If the specified value was not obtained: