Checking wiring

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Check the engine control module (ECM) and heated oxygen sensor (HO2S) connectors for contact resistance and oxidation according to Contact resistance and oxidation .

Check in particular for damage, or loose terminal pins.

Check the signal cable between engine control module (ECM) terminals 76 and 19 and knock sensor (KS) terminals 2 and 3 for an intermittent open-circuit and remedy according to Open-circuit, intermittent faults .

Check signal cable between engine control module (ECM) terminal 51 and knock sensor (KS) terminal 1 for an intermittent short-circuit to ground and remedy according to Short-circuit to ground, intermittent faults , for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults and for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information

To connect the breakout box, see Connecting the breakout box. EMS 2000
To replace the knock sensor (KS), see Replacing the knock sensor (KS) .

Fig 1: Identifying Knock Sensor (KS) 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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