Compression Check: Testing and Inspection

Engine Compression Test

Removal Procedure

1. Remove the throttle valve module. Refer to 1401335 - Replace Throttle Valve Module.
2. Remove the spark plugs. Refer to 1401340 - Spark Plugs, Remove and Install.
3. Remove the relay holder cover.
4. Remove the fuel pump relay.
Draw relay K3 out of mounting plug.

Measurement Procedure

Compression, Check

* 4 cylinder

Important: Engine revs at least 300/min.


* Start the engine (approx. 4 seconds).
* Compare the compression values.
Maximum pressure differential 100 kPa (1 bar)

Installation Procedure

1. Install the fuel pump relay.

* Place into the socket.
* Ensure the plug contacts are sound.

2. Install the relay carrier cover.
3. Install the spark plugs. Refer to 1401340 - Spark Plugs, Remove and Install.
4. Install the throttle valve module. Refer to 1401335 - Replace Throttle Valve Module.