Please tell me i didn't fry my ECU!

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Please tell me i didn't fry my ECU!

Postby HJ2 » Tue 27.04.2021, 19:46

Strange things are happening the last couple of 3 days:

day1: Found an oil leak (it never ever leaks, bone dry!) and it looks like it came out of the oil pan gasket. I torqued the bolts, but did not see / feel anything strange. Also there was oil leaking from the cam cover gasket. To the outside and to the spark plugs. Cleaned everything and retorqued those as well. strange... over-pressure perhaps?

Day2: After a short drive it started missing a beat occasionally. Then: CEL! cheapscan showed error 14 (coolant temp high) AND error 15, coolant temp low ??? Hmmm. loose contact on the CTS?

Day 3: (Today) after 1.5 hour motorway driving: Missing more beats, reduced power, rough running (rich) and CEL again! Now: error 41 (HES), error 42 (CAS?) AND error 51, the one with all the dollar signs ECU fault.

I don't have a clue where to start, but sice the errors are pretty random: perhaps a loose ground strap?
How can I test the ECU? :evil:
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Re: Please tell me i didn't fry my ECU!

Postby dapinky » Tue 27.04.2021, 20:07

Henk-Jan,

Can you simply swap the ECU from the steel blue one with the one from the silk red and see if the problem goes with the ECU or stays with the car?

Even if one is open loop, and the other closed loop, it is 'only' the memcal chip which will need to be swapped over?

(There may be other ways to test things, but I'm no electronics guru).
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Re: Please tell me i didn't fry my ECU!

Postby Rambo » Tue 27.04.2021, 20:44

Good idea. It should work. I'm sure Geof, Simon, Phil erc.. will have something to add :wink:
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Re: Please tell me i didn't fry my ECU!

Postby GeoffSmith » Tue 27.04.2021, 21:09

You didn't fry your ECU… well that's what you told us to say.

You could try cleaning and re-seating the ECU & MEMCAL connectors and engine earths first, preferably with some switch lube. Then, just in case it is an earthing issue resulting in damaging voltage spikes, do what Pinky says but try the suspected bad ECU in the known good car.
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Re: Please tell me i didn't fry my ECU!

Postby HJ2 » Tue 27.04.2021, 21:41

Top tip i don’t want to damage 2 ecu’s…
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Re: Please tell me i didn't fry my ECU!

Postby Simon_P » Wed 28.04.2021, 06:08

Check that:
the battery connections are tight.
Plenum/engine earth
The fan earth (can play havoc if loose)
Fuse A5 and A10? And the voltage at the fusebox. polish the fuse blades.
Check the 2 big loom plugs in the engine bay
Check and re-seat the ECU plugs.
Post a scan here.
Hopefully that will fix the problem.
Swap ecu to other car etc - That should tell you that you didn't fry your ECU.

HJ2 wrote:How can I test the ECU?
Assuming it isn't fried (and if it is) pages 93 and 101? of the relevant electrical manual. 93 gives the plug pins and expected voltage. Remove the blue and grey clips for easier access with the meter probe.
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Re: Please tell me i didn't fry my ECU!

Postby HJ2 » Mon 03.05.2021, 16:25

The battery connections are tight. # CHECK. No problems here
Plenum/engine earth. # Plenum side checked, where does the other end go? I found one bondstrap at the fire wall, but the other one (from the intake) dissapears in the interior...
The fan earth (can play havoc if loose) # Checked, but not a problem (anymore, found a loose wire one or two topics earlier...)
Fuse A5 and A10? And the voltage at the fusebox. polish the fuse blades.
Check the 2 big loom plugs in the engine bay. # Disconnected them and inspected. All clean /dry. treated with contact cleaner / protector and connected them again
Check and re-seat the ECU plugs.
Post a scan here.
Hopefully that will fix the problem.
Swap ecu to other car etc - That should tell you that you didn't fry your ECU.

I re-seated the plugs of the coil packs as well.
I will update again later... :cheers:
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Re: Please tell me i didn't fry my ECU!

Postby Steve A » Mon 03.05.2021, 18:39

Check that the ECU hasn't got an individual pin pushed in.
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Re: Please tell me i didn't fry my ECU!

Postby HJ2 » Mon 03.05.2021, 18:58

Eh… could you explain that a little more?
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Re: Please tell me i didn't fry my ECU!

Postby Simon_P » Mon 03.05.2021, 19:14

HJ2 wrote:Plenum/engine earth. # Plenum side checked, where does the other end go? I found one bondstrap at the fire wall, but the other one (from the intake) dissapears in the interior...

There should be 3 black wires 2 are joined at the connector the third has its own connector they all go on the same screw on the end of the plenum. I think that they all go to the ECU.
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Re: Please tell me i didn't fry my ECU!

Postby HJ2 » Thu 13.05.2021, 17:21

Well...

I replaced both fans just now (what a fight!) and also tightened some more earth straps on the go.
After that I disconnected the battery in order to reset the stored errors and took the car for a spin.

All looks A-OK again!
(for now)

Strange, this one...
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Re: Please tell me i didn't fry my ECU!

Postby HJ2 » Thu 13.05.2021, 17:33

Well...

I replaced both fans just now and also tightened some earth straps on the go.
After that I disconnected the battery in order to reset the stored errors and took the car for a spin.

All looks A-OK again!
(for now)

Strange, this one...
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Re: Please tell me i didn't fry my ECU!

Postby MackieRM » Mon 28.06.2021, 05:13

Good to hear the new fans were able to fix the issue. My uncle is looking at an Elan as the next project after we finished installing the front shocks and motorcycle exhaust on the Honda bike. The car also throwing the coolant temp issue code. We'll check the fans first.
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Re: Please tell me i didn't fry my ECU!

Postby HJ2 » Mon 28.06.2021, 05:45

If it throws a code, it is probably a sensor.
What is the code then?
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Re: Please tell me i didn't fry my ECU!

Postby Rambo » Mon 28.06.2021, 10:17

HJ2 wrote:If it throws a code, it is probably a sensor.
What is the code then?


I'd put my money on 14 :wink:
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Re: Please tell me i didn't fry my ECU!

Postby HJ2 » Mon 28.06.2021, 11:09

50 / 50 then, as i want half of the money :lol:
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