TwinTurbo.NET: Nissan 300ZX forum - AC issue has me stomped!!!!! Any help would be helpful
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Subject AC issue has me stomped!!!!! Any help would be helpful
     
Posted by TTZ2NV(EPTmotorsports) on September 14, 2012 at 3:32 AM
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Message Hello hello! Im working on an 96TT with a 95 harness, I followed conVerTT's guide to properly wiring the fpc and ac systems. The fpc worked with no issue, and ac is now working however there is an issue with the ac that I can not figure out.

When the customer brought the z in he had run a independent grounded wire and switch to operate the ac compressor, and it worked fine as far as turning on or off with the aftermarket switch. After I wired the sky blue wire #46 on the ecu plug, to a freshly inserted wire into pin #2 on the f2 connector. Now the ac compressor clutch engages as soon as the car is turned on regardless if the climate control pod is on auto or off. I can control the fan speed, the mode, and even the temperature, but the ac compressor clutch won't disengage.

If I pull the ac fuse or relay it disengages, if i turn off the car it disengages, if I unplug the ac pod it still runs. I replaced the ac auto amplifier under the dash with no success. I tried a diferent ecu with no success. When I press the auto button on the ac pod sometimes the check engine light will flash 2 times long and slow than the check engine light will stay on, sometimes it flashes 4 times quickly and then the check engine light will stay on, sometimes it doesn't come on at all.

It also seems as if the ecu isn't registering something because the rpms aren't very hi upon cold start maybe 1100 at the most, and no adjustments to the idle, so the z monentarily bogs when the ac compressor clutch engages/disengages and also the car bogs sometimes during start up or when in reverse if the ac compressor clutch is engaged.

Any suggestions would be helpful, thanks in advance.

     
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