False Crank Sensor Triggering

[Alex DTA]

At least you've got an idea of where to look. Unless anyone else has a better idea, I'd suggest you're at the point you need to get an electrician to look at it.

[PhillipM]

Is the crank sensor now the ONLY wire that connects to the ECU sensor earth pin? Or are there still wires joining in further down for the other sensors?

[alistai_Westy]

Hi Phil,

Yes the crank sensor is the only one that is plugged in during testing. The loom is stock DTA and pin 29 is also wired to Lambda, TPS, MAP, Air and Water temp as per the S40 Pro wiring diagram.

Cheers

Al

[stevieturbo]

Try a new flasher relay or switch ?

Presumably the indicators dont affect things ?

[Alex DTA]

pin 29 is also wired to Lambda

No, our looms have lambda wired to main earth, pin 13 or 14.
Have you run a sensor to that earth maybe?

[stevieturbo]

Power for lambda heater would be wired to earth ?

On a 4 wire NB sensor if that's what he is using, surely the signal ground would go to signal ground, with 0-1v being the +ve portion.

[Alex DTA]

I checked, and all our looms have lambda earthed to pin 13 or 14. I don't know what the reason is, but I'll find out.

[alistai_Westy]

Hi Guys,

My mistake the Wideband is wired to power ground 13/14. It is a 3 wire Innovate. It is unplugged and problem is still evident. So I'm sure all sensor earths are correctly routed to 28/29.

All switches that impose an electrical load cause injector firing, that is hazards, indicators, side lights, high beam etc.

Is it possible there is a fault with this ECU?

Cheers

Al

[stevieturbo]

That really is the weirdest problem I've ever heard of for such a relatively simple system.

Can you always drive in the daytime and avoid using lights ? lol

The S40 has a plastic shell, ie no way to earth or shield it ?

[lumley32]

could it be the load is pulling the battery voltage down so low that the ecu resets? more thinking out loud!