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Guest Message by DevFuse

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EJ22 Ignition Relay Replacement Guide

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2 replies to this topic

#1 Talasas


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  • Adelaide, SA

Posted 14 June 2011 - 08:24 AM

Hi all,

After going down the very long and expensive road of troubleshooting of why my EJ22 would idle on 3 cylinders I found the issue to be the (infamous) Jideco ignition relay. Many hours of searching showed this as a common issue but the only resolution I've seen so far was to replace it with another used item of questionable condition or try and find a brand new one.

I have a solution for this which replaces the old Jideco relay with a pair of readily available aftermarket relays. Digging through some cars at a wrecking yard I found a common trend among ones with faulty ignition relays. Generally all pre 1992 models with AT seem to have this issue, in fact every one I have ever come across has shown signs of this problem. I own a manual pre 1992 model which does not have the idle issue. Among the few cars I saw in the wrecking yard, all series 2 AT models still had the original relay. If anyone can offer any more information on this please let me know.

Anyway, one can simply replace the Jideco relay with a pair of suitable aftermarket relays. I have used two Bosch 0 332 019 150 relays, these are 12V 30A relays and can be had for around $8 each. Just neatly make yourself a set of blade terminals and you can plug them straight into the caramel coloured factory relay plug.

I have been using this setup for almost two weeks and have had the benefit of testing it in various weather conditions and it's worked perfectly.

Wiring Diagram
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Bosch Relay
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Relay Internal Diagram
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Terminals, I just taped the relays together
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Ignition Relay Plug Side
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#2 Ricearu


    Official De-Ricer!

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  • DFW, TX

Posted 14 June 2011 - 11:26 AM

little bit for you here, I use these for wiring honda ruckus ignition switches to work with chinese 150cc engine harnesses. :)


darn good information though! and good write up!

#3 Dmill


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Posted 03 November 2015 - 04:50 PM

Bringing a dead thread back to life, I'm trying to replace mine in an ej22 swap, the wiring diagrams would be extra helpful.. My manual doesn't help on this one.. I have tea searched plenty but can't come up with it

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