LEMON Manuals: Even more car manuals for everyone
Home >> Land Rover >> 2017 >> Discovery Sport SE >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine - GTDI 2.0L Petrol/GTDI 2.0L Petrol SULEV -- Discovery Sport (L550) >> Engine - GTDI 2.0L Petrol/GTDI 2.0L Petrol - SULEV (G1347534) >> Diagnosis And Testing >> Engine >> Pinpoint Tests >> Pinpoint Test B: Cylinder Compression Tests

Pinpoint Test B: Cylinder Compression Tests

  1. B1: CYLINDER COMPRESSION TEST 1 
    WARNING: Ensure that the transmission remains set to Park. Failure to follow this instruction may result in personal injury.
    NOTE:
    • Due to the possibility of loose carbon being trapped between a valve and seat affecting the pressure readings, poor results should be ignored initially. Re-install the spark plugs, road test the vehicle and perform the cylinder compression test again. If the correct pressures are restored, no further action is required.
    • DTCs may be set during this test. When complete, using the manufacturer approved diagnostic system, clear the DTCs.
    • The cylinder compression test should be performed with the engine at normal operating temperature.
    1. Remove the fuel pump relay
    2. Start the engine - The engine will start, run for a few seconds, and then stop
    3. Remove the spark plugs
    4. Install the compression tester to the first cylinder
    5. Install an auxiliary starter switch in the starting circuit
      NOTE: This step is performed with the ignition set to off.
    6. Using the auxiliary starter switch, crank the engine a minimum of five compression strokes and record the highest reading and note the approximate number of compression strokes required to obtain this reading
    7. Repeat the step  6 for each cylinder, cranking the engine approximately the same number of compression strokes

    Is the minimum cylinder compression reading recorded within 10% of the maximum cylinder compression reading recorded?

    Yes  : No fault found

    No  : Perform a leakdown test to determine the cause of the low cylinder compression

scientia non olet · About LEMON Manuals