Checking wiring

Check the DSA control module and engine control module (ECM) connectors for contact resistance and oxidation according to Contact resistance and oxidation .

Check in particular for damaged or loose terminal pins.

Check the signal cable between the engine control module (ECM) #20 and DSA control module terminal 15 for an intermittent open-circuit and remedy according to Open-circuit, intermittent faults .

Fig 1: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

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