Checking wiring

Check the signal cable between engine control module (ECM) terminal #47 and engine coolant temperature (ECT) sensor terminal #1. Check for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults . Remedy if necessary.

Try a new engine coolant temperature (ECT) sensor according to Replacing the engine coolant temperature (ECT) sensor .

Other information 

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

Fig 1: Identifying Engine Coolant Temperature (ECT) Sensor And Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying EMS2000

Courtesy of VOLVO CARS OF NORTH AMERICA.

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