Checking wiring and components

Check the system relay (2/14) base and engine control module (ECM) connectors for contact resistance and oxidation according to Contact resistance and oxidation .

Check for loose or damaged terminal pins.

Fig 1: Identifying Integrated Relay/Fusebox In Engine Compartment

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

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Was a fault detected? 

• YES 

  Refer to Verification 

• NO 

  Refer to Checking wiring and components 

Check that the resistance in the system relay (2/14) between terminals 1 and 2 is approximately 75 Ω at +20 °C. Replace the system relay if necessary.

Check the system relay power supply to terminal 2 (86) via fuse 11 in the relay box in the passenger compartment.

Check the cable between system relay base 2 (86) and fuse 11 for an open-circuit according to Open-circuit, permanent faults .

Check the signal cable between engine control module (ECM) terminal 10 and system relay base terminal 1 for a short-circuit to ground. Remedy according to Short-circuit to ground, permanent faults and for an open-circuit according to Open-circuit, permanent faults .

Other information 

• To connect the breakout box, see Connecting the breakout box. EMS 2000 .

Fig 1: Identifying System Relay Control Connector Terminals

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Fig 2: Identifying Ohmmeter

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Fig 3: Identifying System Relay Base Terminals

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• Continue 

  Refer to Verification