ECU pinouts, Schematics.'94/5 MX6 / PGT - OBDI and 95/6 & 97/8 Millenia / Eunos OBDII - Page 5 - Mazda MX-6 Forum
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post #61 of 68 (permalink) Old 11-14-18, 8:33 Thread Starter

 
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IMPORTANT NOTE: For people in the UK and possibly Europe!

I had a KLK7 ECU pulled from an 1998 Australian Eunos 800 2.5L (Xedos 9 / Millenia)... as far as I knew it wasn't paired with an immobiliser, but when I compared the internals to the KLH7 in my 1996 UK MX6 it had an identical circuit board. A few minor differences in resistors but 99% the same. I figured the differences were because of the MAF setup on the KLK7 and a VAF setup on the KLH7.

Here comes the kicker... I wired up the MAF and IAT sensors and then plugged the the KLK7 ECU in! .. got a few codes from the diagnostic port which I think they were 11, 23 and 24. Tried cranking the engine but it would not start. Later found out that there was an immobiliser for my KLH7 (the original ECU). Which meant it was highly likely that the KLK7 ECU also had an immobiliser including valid keys, which I did not have, only the ECU.

What I discovered is the 1995+ OBDII versions of the Mazdas came with a Temic Immobiliser box that uses a coil antenna in the ignition lock to read a chip in the key. Once it finds a valid programmed key it then sends a code word to the ECU to enable fuel and spark.

Unfortunately when I put the original ECU back the car would not start, then I found a document on the Temic immobiliser that said if you put in a new ECU or one from another car, or one that has not paired with an immobiliser, that ECU will try to pair itself with the existing immobiliser and if successful will lock itself to this ECU and not allow the original ECU to start the car. OH NO!! REALLY!!
PDF see immobiliser.pdf see page 3

Is this the reason I can't start the car or have I fried the ECU??

I have now sent the ECU and immobiliser to a specialist (see link) to see what my options are for re-establishing communications. ECU Decode

Will keep you updated on the outcome. If anyone wanted to put a functioning ECU from another car (in UK or Europe) Darren from ECU Decode said, he does this as a service because replacement parts are no longer available, and the car is useless without a functioning ECU.

I hope this helps someone!

17" ROH Adrenaline Alloy Wheels, Superchip (for hi-octane +12hp), Stainless steel scuff plates, Powerfolding jdm mirrors, Mazda 6 MPS brakes (front + rear), 929 brake master (mx6 reservoir), JDM headlights, Altezza tail lights, Modified stock radio/cd with line-out +amp, Sound deadened doors + rear quarters << massive improvement

Last edited by gwq_uk; 11-15-18 at 8:10.
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post #62 of 68 (permalink) Old 11-15-18, 8:29 Thread Starter

 
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Update:

I spoke to Darren at ECU Decode and he told me the immobiliser and the original ECU "no longer liked each other". Basically the code in the immobiliser is scrabbled!

A replacement for this "Temic" immobiliser are not available and the company that made them does not exist, second hand ones are not an option. Mazda dealers send ECUs to Darren to work his magic, and "decode" a good working ECU to work on any compatible vehicle.

This means the factory immobiliser will have to be bypassed completely. The alternative is not an option, ie. a non-running car.

He also said the KLK7 (Eunos 800 / Xedos 9 / Millenia) although very similar in its circuit, did not appear to have any immobiliser chip, when the immobiliser tried to talk to it, it probably sent back jibberish and corrupted the coding on the Temic unit, thus rendering the paired ECU & immobiliser useless after that.

I am yet to get the ECUs back but ECU decode appear to do a lot more than decode ECUs.

17" ROH Adrenaline Alloy Wheels, Superchip (for hi-octane +12hp), Stainless steel scuff plates, Powerfolding jdm mirrors, Mazda 6 MPS brakes (front + rear), 929 brake master (mx6 reservoir), JDM headlights, Altezza tail lights, Modified stock radio/cd with line-out +amp, Sound deadened doors + rear quarters << massive improvement

Last edited by gwq_uk; 11-23-18 at 5:17.
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post #63 of 68 (permalink) Old 1-7-19, 23:53
 
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Hi gwq. I have been following your posts. Very interesting but mostly over my head to be truthful. II have a Eunos Presso with the 2.5L KLZE conversion. I am pondering the MAF swap as an option. Where does the KLY6 18 881R 00 ECU fit into all of the work you have done? Is that an option for a MAF conversion??
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post #64 of 68 (permalink) Old 1-26-19, 22:25
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Wow this much appreciated info mustve taken some time to get together thank you unfortunately im a 93 mx-6 owner,
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post #65 of 68 (permalink) Old 3-9-19, 4:21 Thread Starter

 
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Quote:
Originally Posted by project_B10 View Post
Hi gwq. I have been following your posts. Very interesting but mostly over my head to be truthful. II have a Eunos Presso with the 2.5L KLZE conversion. I am pondering the MAF swap as an option. Where does the KLY6 18 881R 00 ECU fit into all of the work you have done? Is that an option for a MAF conversion??
There are two distinct ECU pinouts ... one for the v6 2.5L OBDI (1992 - 1995) and the other for v6 2.5L OBDII (1996 - 1997) ... what year is the KLY6 ECU?

ie. OBDI or OBDII

17" ROH Adrenaline Alloy Wheels, Superchip (for hi-octane +12hp), Stainless steel scuff plates, Powerfolding jdm mirrors, Mazda 6 MPS brakes (front + rear), 929 brake master (mx6 reservoir), JDM headlights, Altezza tail lights, Modified stock radio/cd with line-out +amp, Sound deadened doors + rear quarters << massive improvement

Last edited by gwq_uk; 3-23-19 at 5:13.
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post #66 of 68 (permalink) Old 3-9-19, 4:22 Thread Starter

 
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Quote:
Originally Posted by Gamma500ww View Post
Wow this much appreciated info mustve taken some time to get together thank you unfortunately im a 93 mx-6 owner,
Unfortunately? Please explain?

17" ROH Adrenaline Alloy Wheels, Superchip (for hi-octane +12hp), Stainless steel scuff plates, Powerfolding jdm mirrors, Mazda 6 MPS brakes (front + rear), 929 brake master (mx6 reservoir), JDM headlights, Altezza tail lights, Modified stock radio/cd with line-out +amp, Sound deadened doors + rear quarters << massive improvement
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post #67 of 68 (permalink) Old 4-22-19, 16:07
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hope this is in the correct thread, i have a mx6 logbook says its a 1996, however it is a obd1. just wondering if anyone had the eco pinout diagram for this, also its a uk spec, thanks in advance
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post #68 of 68 (permalink) Old 6-18-19, 2:33 Thread Starter

 
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Quote:
Originally Posted by Tomtaylor998 View Post
hope this is in the correct thread, i have a mx6 logbook says its a 1996, however it is a obd1. just wondering if anyone had the eco pinout diagram for this, also its a uk spec, thanks in advance
If you look at the very first post there is a link to a document that shows all the pinouts for OBDI (91-95) and OBDII (96-98). [plus much more]

It is impossible to have a car manufactured in 1996 and be OBDI. It is more likely that the logbook belongs to a different car. What is the code on the ECU starting with KL-?? ?

Oh... the problem I had with the ECU was not the ECU, it was a faulty fuel pump relay. When I got the ECU back from ECU decode the car still would not start. I later found out that the contacts in the relay were corroded and prevented it from engaging.

17" ROH Adrenaline Alloy Wheels, Superchip (for hi-octane +12hp), Stainless steel scuff plates, Powerfolding jdm mirrors, Mazda 6 MPS brakes (front + rear), 929 brake master (mx6 reservoir), JDM headlights, Altezza tail lights, Modified stock radio/cd with line-out +amp, Sound deadened doors + rear quarters << massive improvement
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