Spare ECU Spec Advice Needed

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JEASPEKE
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Spare ECU Spec Advice Needed

#1 Post by JEASPEKE » Tue Jan 14, 2020 7:45 pm

Need an ECU spare for future. The spec on my car is:

3782-PP5-E01
722 - 306912

Have been offered one that is marked

3782-PP5-R00
726- 105224

Not sure if that will be correct ECU for my engine? Any advice

Thanks

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Johnny 216GSi
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Re: Spare ECU Spec Advice Needed

#2 Post by Johnny 216GSi » Tue Jan 14, 2020 9:27 pm

You do need to match the part code exactly to the one you have, so the R00 version will be no good.

For reference:

The Honda part codes all begin with "37820" for the R8 (and Honda Concerto)

Then:

PP4 - SOHC 216
PP5 - DOHC 216

Then:

E01: Non-cat, manual gearbox
E51: Non-cat, automatic gearbox
G01: Cat, manual gearbox
G51: Cat, automatic gearbox
R00: Cat, Lucas 5as remote alarm/immobiliser, manual gearbox
R50: Cat, Lucas 5as remote alarm/immobiliser, automatic gearbox

The R00 you've been offered will be expecting a coded "immobiliser disarm" signal on one of its wiring harness pins - it will only allow the car to start when it sees this message. It would be generated by the 5as unit installed with the car it came from (matching pair of units) - your unit will not be generating this signal as its an earlier car, so the car will never start.

The second problem is that yours is an E01, which is pre-cat and has a manual potentiometer installed outside the case to adjust CO2 exhaust levels. The R00 unit will be expecting a lambda sensor signal (amongst others) on one or more pins of its wiring harness - your car doesn't have an O2 sensor as it doesn't run "closed loop". The R00 unit will never work, neither will a G01 unit (nor an E51, G51 or R51).

Search "37820-PP5-E01" on Ebay. There are millions of them for sale. Make sure the photo of the item for sale shows it has a manual CO2 adjustment potentiometer visible along one of the long sides of the unit and that the seller hasn't removed it (or cut it off!!). Then it should just be a plug-and-play replacement for your own ECU,
Rover 216GSi K reg. Flame Red over Tempest Grey

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JEASPEKE
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Re: Spare ECU Spec Advice Needed

#3 Post by JEASPEKE » Tue Jan 14, 2020 9:50 pm

Thanks saved me making a mistake there, very grateful
Will look out for correct spec Ecu do you have a photo of the potentiometer?

Cheers

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Johnny 216GSi
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Re: Spare ECU Spec Advice Needed

#4 Post by Johnny 216GSi » Tue Jan 14, 2020 10:56 pm

JEASPEKE wrote:
Tue Jan 14, 2020 9:50 pm
Thanks saved me making a mistake there, very grateful
Will look out for correct spec Ecu do you have a photo of the potentiometer?

Cheers
Below is just an Ebay image - but it shows the potentiometer - that black thing at the top with its white plug. All ECU case mouldings have "ears" cast into them on one side. On the E01 and E51 units, the potentiometer assembly slots into the ears and sits along with the ECU under the passenger footwell. If you have the Haynes manual that covers the earlier cars too, there's a section in there that covers how you slide the potentiometer out of those "ear" mountings and give it a turn (presumably with an emissions checker stuck on the exhaust) to adjust idle CO2.

Some sellers take them off... It would be worth getting one complete as you've then got a spare potentiometer as well as a spare ECU. If you just buy an ECU, you can transfer over your old potentiometer - they don't usually fail to be honest, but the carbon track inside can get a little corroded or anodised and you can get some odd resistances out of them as you turn them, which would make idle CO2 adjustment quite difficult (having to try and find a part of the track that isn't corroded and behaving normally). Having said all that, it's "just" a potentiometer - so in theory replaceable with an off the shelf electronic component selected to be the right maximum resistance value.

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Rover 216GSi K reg. Flame Red over Tempest Grey

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JEASPEKE
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Re: Spare ECU Spec Advice Needed

#5 Post by JEASPEKE » Wed Jan 15, 2020 6:39 pm

Thanks, will make sure I get an ECU with that attached
Cheers
John

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