3b s2 coupe resurrection

[twoqu]

Not sure I am explaining it too well. By checking continuity from the ring back to the ecu does not prove it is grounded only that the connection is intact. Really the engine is poorly grounded to the chassis. So what I was suggesting is ensuring that the ecu grounds on the inlet are grounded to the chassis. So you should get continuity between the ecu grounds on the inlet and a good chasiss ground in the engine bay if you see what I mean.

[andy10v]

I checked and got continuity for

14/55-Ground for Fuel Injectors (N30-83)
10/55- One of the Grounds for the ECU
19/55- Ground from the ECU for various ECU controlled devices
24/55- Power Ground for "actuators" other than injectors

Between the ECU loom plug and the intake manifold

[twoqu]

The injector ground is from pin 14 to the inlet manifold so that needs extra special attention. I would also check for continuity between all those ground rings and a chassis earth rather than just continuity back to the ecu, particularly the inj one!
Charge the battery.
Clear the faults codes. Crank it and see what comes up in the 02 field again.
If the hall sensor faults comes up then we need to look at that as well. If its a hall sender issue then the injectors won't fire. Doesen't explain the output test issue though to my mind as the ecu must ground the injectors to make them click.

[andy10v]

Check the chips are plugged into the ECU properly?

Nope

Will check tomorrow.

[andy10v]

I think we are chasing our tail a bit!
Basically we know the injectors are not being grounded by the ecu for some reason. I would check the continuity back to the inlet manifold ring. Then continuity back from the inlet to the ecu. If thats all intact then check the ground pins mentioned above for continuity with a good chassis ground. Then that leaves either the connector or the ecu!
Might have some input tomorrow if I can find that spare loom!

Ok, will check the injectors back to ecu plug tomorrow.

ECU ground for injectors and ecu grounds have continuity to intake manifold.

[newsh]

Check the chips are plugged into the ECU properly?

[twoqu]

I think we are chasing our tail a bit!
Basically we know the injectors are not being grounded by the ecu for some reason. I would check the continuity back to the inlet manifold ring. Then continuity back from the inlet to the ecu. If thats all intact then check the ground pins mentioned above for continuity with a good chassis ground. Then that leaves either the connector or the ecu!
Might have some input tomorrow if I can find that spare loom!

[newsh]

Pin 30 is the return path for all those devices, not exactly a ground but serves the same purpose AFA the ECU is concerned.. I think it must be ok or none of the O/P tests would work.

E14 in this http://www.s2central.net/S2_Schematics/B/B73-02.pdf

and this http://www.s2central.net/S2_Schematics/B/B73-03.pdf

[andy10v]

Correct, none of those have been touched.

[twoqu]

Looks like the main ecu earths are pins 10 14 19 24 on both 3B and ABY and pin 30 serves the same purpose on both as well. Presumably you didn't need to touch these to convert to COP.

[andy10v]

Think this may be a false lead. Any of the major grounds would have a cable brown in colour as far as I can make out!
If its black and lilac its the screening for the sensors such as knock sensor etc. At least that true for the 3b loom!

Yup I think you are right.

[twoqu]

Think this may be a false lead. Any of the major grounds would have a cable brown in colour as far as I can make out!
If its black and lilac its the screening for the sensors such as knock sensor etc. At least that true for the 3b loom!

[andy10v]

it sucks that you are still chasing this. If you need to borrow my ABY ecu or any other bits let me know. my 90 will be off the road for a while now i think.

Yeah I thought I was getting somewhere Next track day is Wed 13th of May.

I am going to borrow a spare ECU from Alex, at least that way if it gets fried its a spare rather one from a car being used.

Do you have more than just a drive shaft you want to replace?

[martinws]

it sucks that you are still chasing this. If you need to borrow my ABY ecu or any other bits let me know. my 90 will be off the road for a while now i think.

[andy10v]

Back to plan B, burn it.

Enough for tonight, thanks for the help gents