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TCM to ECM CAN Bus Terminal Resistance, Checking|Page 3640 > < TCM to ECM CAN Bus Terminal Resistance, Checking|Page 3638
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Engine Control Module: Testing and Inspection
Voltage Supply, Checking

Voltage Supply, Checking

Observe all safety precautions: => [ Safety Precautions ] See: Service Precautions/Safety Precautions

View clean working conditions: => [ Clean Working Conditions ] See: Service Precautions/Clean Working Conditions

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

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: 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

TCM to ECM CAN Bus Terminal Resistance, Checking|Page 3640 > < TCM to ECM CAN Bus Terminal Resistance, Checking|Page 3638