John, if it is the MBE ECU, it should have the following connector, the casing can be taken apart carefully, but it is easy to damage it. The red locking tab can be slid out to remove the connector clamp, allowing the connector to be probed:
Thanks for that James and Jonathan, but I'm quickly getting into the realms of "I'm not sure what I'm doing ". Might have to find a way of getting it to someone
If you feel comfortable in removing the ECU connector, you can probe the continuity and resistance to the coils and individual grounds the ECU uses and measure the supply voltage to the ECU.
I would also ignore the pin location specifics I put in post #12 if your car isn't wasted spark ignition and is coil-on-plug, as I took it from a 2012 diagram, Jonathan should have a more updated version. If you do have a wasted spark system with a single or dual coil instead of coil-on-plug, I would suspect the wiring to the coil or a coil pack failure itself.
Other issues could be a crank or cam sensor failure or wiring to those sensors that is bad, so the ECU is not able to trigger the spark.
Sorry John, the chap stopped and cancelled the test as soon as it failed emissions, so he didn't charge me. I should have been clearer on my first post
John, if it is the MBE ECU, it should have the following connector, the casing can be taken apart carefully, but it is easy to damage it. The red locking tab can be slid out to remove the connector clamp, allowing the connector to be probed:
James
I'm wondering if the initial cause for the off the scale emissions has finally given up
Difficult to say, but ensuring there is a strong spark while cranking would be the first thing I would trace and rectify.
Here is some more ECU connector info:
https://sbdmotorsport.co.uk/wp-content/uploads/pdf/MBE9A4-PinoutIssue_F.pdf
https://sbdmotorsport.co.uk/wp-content/uploads/pdf/Open_wiring_harness-ecu_connector.pdf
James
Thanks for that James and Jonathan, but I'm quickly getting into the realms of "I'm not sure what I'm doing ". Might have to find a way of getting it to someone
If you feel comfortable in removing the ECU connector, you can probe the continuity and resistance to the coils and individual grounds the ECU uses and measure the supply voltage to the ECU.
I would also ignore the pin location specifics I put in post #12 if your car isn't wasted spark ignition and is coil-on-plug, as I took it from a 2012 diagram, Jonathan should have a more updated version. If you do have a wasted spark system with a single or dual coil instead of coil-on-plug, I would suspect the wiring to the coil or a coil pack failure itself.
Other issues could be a crank or cam sensor failure or wiring to those sensors that is bad, so the ECU is not able to trigger the spark.
James
Where are you?
Hi, I'm in n.wales near mold
John
Down the road from me then,
Back to basics for a mo...
Can you post the full MOT emissions results?
JV
Sorry John, the chap stopped and cancelled the test as soon as it failed emissions, so he didn't charge me. I should have been clearer on my first post