Engine light on not starting

Look at the back of the cylinder head between the engine & the firewall, see if you can find the cam position sensor, and see if that is where that belongs

I'll look now,

This is how you get codes on an OBDI Jimny - the monitor coupler is behind the glove box, you insert a jumper wire (#4) in to the connector so that it connects the diagnosis terminal (#3) to ground (#2) and then switch the ignition on, the check engine light should flash.

If the ECU detects no faults it should flash a "Code 12", which is one flash, followed by a short pause and then two flashes, followed by a long pause, and this will repeat.

 

Some codes, like the #42 for the cam position sensor are not detected unless the engine is cranked, so if you get a code 12, crank the engine with the jumper wire in and then look at the flashes before switching off to see if they have changed.

Thanks I will try this at weekend as I am back at work now. But I can't find any connection at back of engine. I did check the connector in question when ignition on and it gives blue wire at 12v, white at 6v, black to ground no reading with ignition off. I'll be on line after weekend ,thanks

 

If the car has an immobilizer, you might see 8X codes.

I have that plug with no obvious place to connect it to as well. Same sheathing, female end etc. Mines a 2007 M13A, fitted with a 2012 engine. 

I brought my Jimny as a non runner and this mystery plug has always confused me. It's still not connected and my Jimny now runs fine. 

To keep the diagnosis simple at the start, i'd be tempted to put a jump lead onto the engine somewhere , maybe the lifting bracket and connect it to the negative terminal of the battery. There's quite a few earthing points and as the body has been off, I'm drawn to that. The one in the photo looks intact, but I'm sure there's two that run from other parts of the loom to connect to the engine block. 
I might be barking up the wrong tree, but I had this years ago on a camper van after someone had damaged the earth point fitting new body panels.