Checking the wiring and component

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.

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off
Check the control module and knock sensor (KS) connectors. Check for contact resistance and oxidation according to Contact resistance and oxidation .
Check the signal cable between control module terminal #51 and knock sensor (KS) terminal #1. Check for a short-circuit to ground according to Short-circuit to ground, permanent faults . Check for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults . Check for an open-circuit according to Open-circuit, permanent faults .

Check the ground lead between control module terminal #76 and knock sensor (KS) terminal #2. Check for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults . Check for an open-circuit according to Open-circuit, permanent faults .

Check the screened cable between control module terminal #19 and knock sensor (KS) terminal #3. Check for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults . Check for an open-circuit according to Open-circuit, permanent faults .

Check that the knock sensor (KS) is not loose.

Try a new knock sensor (KS) if no fault is found during the above fault-tracing.

Remedy as necessary.

Other information
- To connect the breakout box and access the control module, see Connecting the breakout box. EMS 2000
- To access or replace the knock sensor (KS), see Replacing the knock sensor (KS) .
Fig 2: Identifying Knock Sensor (KS) Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Ohmmeter
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying EMS2000
Courtesy of VOLVO CARS OF NORTH AMERICA.

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Refer to Verification