s14 kade to s13 kade ECU conversion wiring help

[BenArtM80]

I am trying to wire up my 96 s14 (obd2) so I can use an s13 JWT ECU. It's originally an auto, but I've done the manual swap and had it running in stock form, but now I'm trying to get it running with a JWT ECU and mild turbo setup. I compared the wiring diagrams and have it about 80% completed, however I'm a little confused about a few things and haven't been able to find the answers I need on the various forums I frequent or at JWT's site.

the A/C system is confusing me a little bit...
pin 9 (orange/black) - triple pressure switch line that goes to pin 45 on F3
pin 12 (yellow/black) - AC switch going to pin 16 on F3
pin 15 (black/pink) - triple pressure switch signal that goes to pin 43 on F3
pin 114 (orange/blue) - recirculation relay goes to pin 37 on F3
Suggestions on how to wire this in to retain A/C?

pins 13&14 are for the cooling fan low&high
Should I just connect them both to the s13 condenser fan signal (pin 9 on the s13 ECU)?

pin 115 (light blue) - front heated O2 sensor - it's a 4 wire sensor where the s13 ECU is only looking for a 3 wire sensor

pin 116&117 - I think this is emissions stuff that I've already removed

pin 26 (yellow/green) - speedometer...how do I wire it in?

pin 58 (red) - data link connector for GST, I'm guessing this won't be used with the s13 ECU

pin 60 (orange) - goes to the lighting switch, but not sure what it does or what I should do with it

I think that's it....thanks for your time

Ben

[BenArtM80]

alright, well I did a little more searching through the wiring diagrams in the FSM and I think I have a few more things figured out. So here's what I'm doing

pins 13 & 14 are for the fans and I've spliced them to pin 9 on the s13 ECU
pins 15 & 114 from the S14 ECU go to pin 11 on the s13 ECU
pins 116 & 117 not used
pin 115 from the front heated O2 sensor I believe is an ECU ground for the sensor, so I'm just going to ground it elsewhere

However, I'm still stuck on the following pins from the s14 ECU
9 & 12 for the A/C system
26 - speedometer
58 - data link
60 - lighting switch

any help is appreciated

[let5l1de]

I just officially passed CA State Test with my s14 obdII conversion into my coupe. I know all about the wiring...

i'll check it out and confirm your pin crossovers tonight.

~mario

[BenArtM80]

outstanding....I have it in an excel file and can email it to you if that works

[let5l1de]

***Please Do Your Research To Check These Answers***

I have FSM's for both or u can download them if needed.

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pins 13 & 14 are for the fans and I've spliced them to pin 9 on the s13 ECU
This should be fine. This may operate as stage (high) only.
Note that S14 pin 13 is low and S14 pin 14 is high

pins 15 & 114 from the S14 ECU go to pin 11 on the s13 ECU
S14 pin 15 to S13 pin 11 is good.
S14 pin 114 to s13 pin 38 or 47? S14 pin 114 is to have ignition on, Full Voltage.

pins 116 & 117 not used
These are both used for emissions, no longer needed.

pin 115 from the front heated O2 sensor I believe is an ECU ground for the sensor, so I'm just going to ground it elsewhere
s13 Front O2 sensor (1 wire or 2 if shield is present) sends 0v - 1v depending on exhaust sample.


O2 Terminal 1 (W w/shield wire) to pin 19 and shield to ECU/Chassis ground. (This wire should be the 0v - 1v transmitting wire)


s14 Front O2 sensor (3 wire "technically 4") sends 0v - 1v depending on exhaust sample.


O2 Terminal 3 "BR" goes to key on voltage
O2 Terminal 1 "L" to pin 115
O2 Terminal 2 "W" (w/shield wire) to pin 46 and shield to ECU/Chassis ground. (This wire should be the 0v - 1v transmitting wire)


Just buy a cheap 1 wire OBD1 O2 sensor. Use S14 O2 sensor terminal 2 "W" (or wire harness/ecu pin 46) and move to S13 pin 19. Use the shield and ground it to ECU/Chassis.

However, I'm still stuck on the following pins from the s14 ECU
9 & 12 for the A/C system

S14 pin 9 gets 7v when ignition is on.

S14 pin 12 gets 12v when ignition is on.

26 - speedometer
I Would Not Use This And Test Speedo :eek: for Function.Could be S13 pin 32.

58 - data link
No longer used.

60 - lighting switch
only used on Canada models AKA Daytime Light Control. Pin 60 gives power when ignition is on. Always has ignition on power according to FSM.
Don't Use Unless Malfunction Exists With The Manual Light Switch.

any help is appreciated
:w00t:

[BenArtM80]

great man, thanks for the info....I will double check everything and hopefully get it wired up correctly soon

I've been trying to figure out how to get a +7v source for s14 pin 9. I was looking around and I've found you can use a resistor or a diode, but I'm trying to figure out the correct size. any suggestions?

[let5l1de]

S13 pin 37 TPS Power Supply is Approximately 5v. Might have a negative effect on TPS.

You could buy a 6.2v zener diode (one way diode) installed inline for regulated voltage from a 12v (13.8v running) source. If you are brave, try a small gauge wire 12v source.

[BenArtM80]

I found some info about the zener diodes and went to radio shack today, but nobody there knew what they were or how they worked. Do I need to install it backwards to accomplish the voltage reduction, or just inline with the 12v source going to the pos. side and the neg side going to the 7v wire from pin 9?

Thanks for walking me through this, I appreciate all the help