I think I have the correct diagram now.
This is weird - your serial number indicates a GH220 engine.
Your model number says that this is not an IM-52, but an NP52G.
See if this schematic doesn't help you.
1. When you click on the link below, a new web page called 4shared will open.
2. When 4shared opens, scroll about half way down the page until you see a BLUE ‘Download Now' button on the left side.
3. Click on the BLUE ‘Download Now' button. Do not click on any GREEN buttons.
4. Clicking on the BLUE button will start a 20 second timer.
5. When the timer expires, a BLUE link that says ‘Download Now' will appear directly above the timer.
6. Click on the blue ‘Download Now' link above the timer to start the download.
Click here to download the file.