Checking compression: Notes

Fig 1: Identifying Ignition Switch OFF Position

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Connectors

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• Ignition off.
• Disconnect the engine speed (RPM) sensor.
• Disconnect the camshaft position (CMP) sensor.
• Remove spark plug.
  • Carry out a compression test at wide open throttle (WOT) and turn the starter motor.

    Normal value 1.3 - 1.5 MPa (13 - 15 kp/cm² ) with engine at operating temperature

  Fig 3: Compression Testing

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Is compression OK? 

• YES 

  FAULT NOT FOUND:  Troubleshooting has been completed.

• NO 

  Refer to Engine repairs