Compression testing

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Fig 1: Testing Engine Compression

Courtesy of VOLVO CARS OF NORTH AMERICA.

NOTE:

Compression testing should always be carried out at wide open throttle (WOT) and with the engine at operating temperature.

Diagnostic trouble codes (DTCs) will be stored because the engine speed (RPM) sensor and (where applicable) the camshaft position (CMP) sensor have been disconnected.

Have an assistant hold the accelerator pedal (AP) depressed at wide open throttle (WOT) during the compression test.

The starter motor is activated with the ignition key.

The ignition must be switched off after each cylinder has been compression tested.

NOTE:

It will no longer be possible to control the throttle if the ignition is on for longer than 2 minutes.

The throttle function is controlled by the control module.

Use compression meter 9999689

with extension sleeve 1158540 .

Engine type:	Normal value MPa:
Turbo	1. 1 - 1. 3
Turbo type LT	1. 2 - 1. 4
Normally aspirated engine	1. 3 - 1. 5