martyuk
Well-Known Member
- Posts
- 824
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- Swindon, UK
It's not a BECM issue if you have fuel to the injectors.
The Check Engine light is only a sign of sync (or lack thereof) on GEMS Petrol vehicles - as the GEMS ECU will illuminate the CEL if it is in receipt of a valid code and will allow starting. The BECM monitors that line and will then allow starting if it sees the signal back from the ECU.
On the Bosch ECU'd vehicles - the Diesels, and the Thor Petrol, they don't acknowledge the receipt of a code, and as such the immobilisation code/starting strategy in the BECM is different. On a Diesel, or Thor Petrol, the BECM will always allow cranking etc (which it will inhibit if no CEL acknowledgement on GEMS) and the actual allowing/disallowing of actually firing the engine up is inhibited by the engine ECU. In the case of the Thor, I think it inhibits the fuel injectors and sparks. In the case of the Diesel, as you have - the ECU inhibits the FIP from sending fuel to the injectors.
One of the good indicators of sync issues on a Diesel is fuel to the injectors. No fuel = no sync (or another fuel delivery problem such as air in the lines, or bad in tank pump for example). Fuel to the injectors means there is fuel getting THROUGH the FIP, so the ECU can't be immobilised and it's trying to start.
If your battery is in good nick, then I'd start with the glow plugs. I had one owner I repaired a BECM for last year keep asking me if the issue was the BECM after I'd looked at it - to the point I took it back, and re-tested it etc. It was finally found that his glow plug timer/relay fuse had blown, and he had 2 dead glow plugs. After replacing the plugs and new strip fuse, it started and ran fine.
