1. Remove the central junction box (CJB) cover.
2. Open the CJB and remove the fuel pump relay.
3. NOTE: The engine will start, run for a few seconds and then stop.
Start the engine.
4. Remove the ignition coil-on-plug.
REFER to: Ignition Coil-On-Plug (303-07 Engine Ignition - 2.5L Duratec (147kW/200PS) - VI5, Removal and Installation).
5. Connect the battery ground cable.
REFER to: Battery Disconnect and Connect (414-01 Battery, Mounting and Cables, General Procedures).
6. Using Special Tool 303-499, remove the spark plugs.
NOTE: Operate the starter motor with wide open throttle until the pointer on the measuring device stops rising.
7. Carry out the measurement in accordance with the instructions supplied with the measuring device on every cylinder using a suitable compression pressure recorder with a suitable adapter.
8. Using Special Tool 303-499, install the spark plugs.
9. Install the ignition coil-on-plug.
REFER to: Ignition Coil-On-Plug (303-07 Engine Ignition - 2.5L Duratec (147kW/200PS) - VI5, Removal and Installation).
10. Install the fuel pump relay and close the CJB.
11. Install the CJB cover.