Reset A/C controller?

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  • Start date Start date
G

Guest

97 S70 with manual A/C.

Was playing around with the low pressure switch connector (foolishly) with
the a/c running and now it wont engage. Am not getting a flashing a/c light
which I presumed I should have if it had detected a fault, but the
compressor now wont engage. System is charged and was working previously.

Any way to interegate the computer and clear any codes without an OBDII
scanner? Several igntion cycles for instance?

TIA

Tim..
 
Tim (Remove NOSPAM. said:
97 S70 with manual A/C.

Was playing around with the low pressure switch connector (foolishly) with
the a/c running and now it wont engage. Am not getting a flashing a/c light
which I presumed I should have if it had detected a fault, but the
compressor now wont engage. System is charged and was working previously.

Any way to interegate the computer and clear any codes without an OBDII
scanner? Several igntion cycles for instance?

TIA

Tim..
Click to expand...

What you did should have no effect on anything, unless you managed to
damage one of the terminals or the wiring.

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
 
Mike F said:
What you did should have no effect on anything, unless you managed to
damage one of the terminals or the wiring.
Click to expand...


Well thats what I thought. I will recheck the 3 pin connector and 3 pins on
the pressure switch, the relay and fuse in the engine bay fuse box tomorrow
and see if I can re-introduce life into the compressor clutch!

Strange as the a/c light on the climate panel comes on when you press the
button as per usual and there is no MIL lamp lit on the dash, as having
thought about it, its the engine ECU that controls the compressor clutch
rather than the climate panel. It also receives the signal from the pressure
switch and the condensor temp switch in order to fire up the rad fan...

I could do with a detailed wiring diagram of the climate / ECU / compressor
layout, as the haynes manual doesnt show it if anyone has one?!?!

Tim..
 
Tim (Remove NOSPAM. said:
Well thats what I thought. I will recheck the 3 pin connector and 3 pins on
the pressure switch, the relay and fuse in the engine bay fuse box tomorrow
and see if I can re-introduce life into the compressor clutch!

Strange as the a/c light on the climate panel comes on when you press the
button as per usual and there is no MIL lamp lit on the dash, as having
thought about it, its the engine ECU that controls the compressor clutch
rather than the climate panel. It also receives the signal from the pressure
switch and the condensor temp switch in order to fire up the rad fan...

I could do with a detailed wiring diagram of the climate / ECU / compressor
layout, as the haynes manual doesnt show it if anyone has one?!?!

Tim..
Click to expand...

Actually the 3 pin switch is for the high pressure. And it's not
actually a switch, it's a pressure sensitive resistor, the fuel computer
uses this info to run the fan on low or high speed or even shut off the
A/C if pressure gets too high. The low pressure switch is the one near
the firewall.

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
 
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