Workshop Repair Manuals

Volkswagen Workshop Manuals

[PREV PAGE] [NEXT PAGE]

volkswagen Workshop Repair Guides


Passat Sedan V6-3.6L (BLV) (2008)

Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Testing and Inspection > CAN-BUS Terminal Resistance, Checking > Page 2605

Page 1
background image

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.  See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check

Start diagnosis

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:

-

Switch the ignition on.

-

Using a Multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 87 to Ground (GND).

Specified value: battery voltage.

If the specified value was obtained:

Checking wiring

If the manufacturers test box is being used. Perform the following step.

-

Install the test box.

Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Testing and Inspection > CAN-BUS Terminal Resistance, Checking > Page 2605

[PREV PAGE] [NEXT PAGE]