Checking the signal cable

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 ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off
Knock sensor (KS) connector disconnected
Ignition on.
Connect a voltmeter between knock sensor connector terminal 1 (control module side) and ground.

Fig 3: Identifying Knock Sensor (KS) Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

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

Fig 5: Identifying Knock Sensor (KS) Circuit
Courtesy of VOLVO CARS OF NORTH AMERICA.

The voltmeter should read approximately 0 V.

OK
Refer to Checking the signal cable
NOT OK
Refer to Checking the signal cable

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off.
Connect an ohmmeter between the knock sensor (KS) connector terminals 1 and 2 (engine control module (ECM) side).

The ohmmeter should read approximately 100 kΩ.
1. 95-105 kΩ
  Refer to Checking terminals
2. 0 Ω
  Refer to Checking the signal cable
3. Infinite resistance.
  Refer to Checking ground leads
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.

Check the cable between knock sensor (KS) connector terminal 1 (control module side) and engine control module (ECM) terminal #51. Check for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Fig 1: Identifying EMS2000

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Knock Sensor (KS) Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Continue
Refer to Verification

Check the cable between knock sensor (KS) connector terminal 1 (control module side) and engine control module (ECM) terminal #51. Check for a short-circuit to supply voltage according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Fig 1: Identifying Knock Sensor (KS) Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Voltage Display

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying EMS2000

Courtesy of VOLVO CARS OF NORTH AMERICA.

Continue
Refer to Verification