GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2009 🢒 Astra 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 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.

    5. 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.
    2. • 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 .