Checking Components And Wiring

Check the signal cable between engine control module (ECM) terminal #B16 (#C16) and the system relay. Check for an open-circuit. Check for a short-circuit to supply voltage. Check for a short-circuit to ground.

Check the engine control module (ECM) and the system relay connector. Check for contact resistance. Check for oxidation.

Try a new system relay if no fault is found during the above fault-tracing.

Remedy as necessary.

Other information 

• see CONNECTING THE BREAKOUT BOX
• see SIGNAL SPECIFICATION
• see CHECKING WIRING AND TERMINALS

Fig 1: Identifying Main Relay

Courtesy of VOLVO CARS CORPORATION

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  Refer to INFORMATION