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Re: I'm not a guru, but Posted by JimBlake [Email] ![]() ![]() ![]() In Reply to: I'm not a guru, but, Mr. Science, Wed, 19 Jun 2002 11:40:50 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I actually brought the books to work today, & there's some confusing details. Yes, the upshift light isn't going to work because in '88 the upshift light is completely independant of the ECU, while in '89 its completely inside the ECU. If you want it to work, you need a vacuum switch, 5th gear switch, the USL relay, & maybe a wiring harness from a '88 car.
The AC is the confusing part... In the AC circuit diagrams, the AC relay connects to different pins of the ECU. But in the LH 2.4 circuit diagram, its absolutely identical. In both cases, the throttle-position switch supplies ground to terminal 'TK' of the AC relay. So, if you remove the wire from that position of the AC relay, the wide-open-throttle shutoff feature shouldn't work. If you disconnect this & the AC still doesn't work, I'd guess there's another problem that was a coincidence.
The other connections supply information in the other direction. The AC relay tells the ECU to open the AIC a bit, 0.3 seconds before engaging the compressor clutch. That stuff won't prevent the AC from operating, just gives the engine a 'heads-up' so it can compensate for idle speed.
posted by 131.184.14...
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