A/C Circuit Guru's needed!
#1
Full Member
Thread Starter
Join Date: Jul 2007
Location: Phoenix
Posts: 72
Likes: 0
Received 0 Likes
on
0 Posts
A/C Circuit Guru's needed!
I'm having some A/C problems and hoped someone could point me in the right direction.
Background info:
90' RX7 Vert w/ TII swap
Purchased the car with working A/C and a Microtech
Swapped ECU to Haltech E8 and A/C no longer works
Using the same logicon that worked 6 months ago
Here's what I have so far
- I went through the Microtech wiring diagram and undid all wiring required for A/C on that system ( put A/C wiring back to stock at the relay and AC-02 connector )
- Haltech work around for A/C and boost control bug performed - Load default_e8.map and setup input and output. I was unable to get a signal from the A/C button even with the "fix".
- Haltech is not receiving a signal from the logicon when A/C button is pressed and illuminated. Tried both my "tuned" map and the default map as recommended by Haltech and those who have gone through it on 7club.
- Compressor shows ground between connector and pump.
- I'm not able to properly activate the A/C main relay which causes no signal to go to the compressor on A/C button depress.
- I've tried 2 A/C relays and still get 12v on the red/yellow wire which is supposed to read 0v when A/C circuit is functioning properly. All other relay posts are normal.
- Inverting the input ( AC request ) from the Haltech turns the A/C system on but will not allow me to turn it off.
- When the A/C is on I can see it flow through the glass. There are bubbles present. I understand this is something that would indicate a low level. However, A/C should not activate at all if the level is too low. This leads me to believe I should be able to run the system as is. I will need a recharge soon but don't want to spend the money until I know it will work.
- I'm thinking there's a short between the logicaon and the front portion of the A/C harness. Everything I have read says the logicon should not light up when the A/C button is pressed unless there is a completed circuit.
I need help bad. I've been losing my patience pretty quickly in the heat. Any good next steps you can think of would be appreciated!
Background info:
90' RX7 Vert w/ TII swap
Purchased the car with working A/C and a Microtech
Swapped ECU to Haltech E8 and A/C no longer works
Using the same logicon that worked 6 months ago
Here's what I have so far
- I went through the Microtech wiring diagram and undid all wiring required for A/C on that system ( put A/C wiring back to stock at the relay and AC-02 connector )
- Haltech work around for A/C and boost control bug performed - Load default_e8.map and setup input and output. I was unable to get a signal from the A/C button even with the "fix".
- Haltech is not receiving a signal from the logicon when A/C button is pressed and illuminated. Tried both my "tuned" map and the default map as recommended by Haltech and those who have gone through it on 7club.
- Compressor shows ground between connector and pump.
- I'm not able to properly activate the A/C main relay which causes no signal to go to the compressor on A/C button depress.
- I've tried 2 A/C relays and still get 12v on the red/yellow wire which is supposed to read 0v when A/C circuit is functioning properly. All other relay posts are normal.
- Inverting the input ( AC request ) from the Haltech turns the A/C system on but will not allow me to turn it off.
- When the A/C is on I can see it flow through the glass. There are bubbles present. I understand this is something that would indicate a low level. However, A/C should not activate at all if the level is too low. This leads me to believe I should be able to run the system as is. I will need a recharge soon but don't want to spend the money until I know it will work.
- I'm thinking there's a short between the logicaon and the front portion of the A/C harness. Everything I have read says the logicon should not light up when the A/C button is pressed unless there is a completed circuit.
I need help bad. I've been losing my patience pretty quickly in the heat. Any good next steps you can think of would be appreciated!
#3
top row 2nd from left..me
Join Date: Jul 2003
Location: chicago
Posts: 336
Likes: 0
Received 0 Likes
on
0 Posts
The A/C is wired into your stock ECU. When the car was upgraded to the Microtech the installer rigged the harness so that the A/C would still work. Search the Microtech forum for A/C and you'll see that you can jump two wires on the stock ECU plug to make the A/C work. The ECU doesn't make a difference unless your using it to bump up the idle for the load of the compressor. Its my opinion its not the ECU swap that has caused your A/C issue.
Heres the thread regarding the A/C from the MT forum.
https://www.rx7club.com/microtech-111/got-my-c-working-184227/
Heres the thread regarding the A/C from the MT forum.
https://www.rx7club.com/microtech-111/got-my-c-working-184227/
#5
Full Member
Thread Starter
Join Date: Jul 2007
Location: Phoenix
Posts: 72
Likes: 0
Received 0 Likes
on
0 Posts
The A/C is wired into your stock ECU. When the car was upgraded to the Microtech the installer rigged the harness so that the A/C would still work. Search the Microtech forum for A/C and you'll see that you can jump two wires on the stock ECU plug to make the A/C work. The ECU doesn't make a difference unless your using it to bump up the idle for the load of the compressor. Its my opinion its not the ECU swap that has caused your A/C issue.
Heres the thread regarding the A/C from the MT forum.
https://www.rx7club.com/showthread.php?t=184227
Heres the thread regarding the A/C from the MT forum.
https://www.rx7club.com/showthread.php?t=184227
Do you know what I need to probe on the interior harness to trace the signal? I went through the FSM but got a bit overwhelmed.
Thank for the help!
#6
Full Member
Thread Starter
Join Date: Jul 2007
Location: Phoenix
Posts: 72
Likes: 0
Received 0 Likes
on
0 Posts
What's up Rat! No. I did look in the glass during a forced turn on though. There are bubbles and I will need a recharge. That shouldn't stop the A/C button signal from reaching the AC2 connector on the driver's side harness next to the A/C main relay though. Am I wrong on that part?
Thread
Thread Starter
Forum
Replies
Last Post
immanuel__7
2nd Generation Specific (1986-1992)
89
09-05-15 10:23 AM