What does the HAC (High Altitude Compensation) sensor look like? I'm almost positive that I don't have it. Do I have to have it or can I jumper something? My ECU is a from a 89 cressida. I know on the supra's the '89 + models had it built into the ECU - I have no idea on the cressidas. and no I haven't checked the A/F ratio but its on my things to do. Oh and I don't have smog in my area.

I don't see anything on my electrical schematic for the ECU that refers to a HAC sensor.http://tellico.off-road.com/wwwthreads_uploads/1464184-schematic2.GIF

Last edited by 4RnrRick; 12/15/05 11:39 PM.
Project Quasimodo
'85 Xtra Cab (2wd, 22RTE, Auto => 4wd, 3RZ, w56, 2.28x4.70)