Re: Clicking APC Solenoid - Saab 900 Bulletin Board - Saabnet.com
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Re: Clicking APC Solenoid
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Posted by Anders Dk [Email] (more from Anders Dk) on Thu, 6 Sep 2001 13:34:59 Share Post by Email
In Reply to: Clicking APC Solenoid, Bobj 88 900T, Thu, 6 Sep 2001 12:07:53
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by unplugging the apc box and measuring at its connector you can measure resistance/connection of pressure transducer and knock sensor. A bicycle pump (any air pump) can generate pressure for testing transducer. Connect it to vacuum hose going to dash (connecting to pres.transducer, turbo gauge and fuel cut out)
For info on pin numbers in apc connector and general info on apc system fault finding follow link.

Anders , Denmark
'88 900 turbo



Ripped from Townsend site :
Check the pressure transducer next. You will need a pressure gauge, an ohm meter and a Mity Vac. With the key on, disconnect the vacuum line going to the transducer at the manifold. Pump up .5 Bar pressure. The APC solenoid should chatter away. If the solenoid chatters, the APC control unit and the pressure transducer are working. To get deeper into the transducer, you will need to measure its resistance at various pressures. On 82 1/2 to 83s, disconnect the wiring to the transducer and measure directly off its terminals. On 83-85, measure the resistance at pins 8 and 9 of the APC control unit with the unit disconnected. On 86 up, measure between pins 10 and 23 of the APC unit with it unplugged. At atmosphere, the spec is 5-13 ohms. Then pump up a pressure of 1.0 Bar (15 psi) and let it off to .6 Bar (9 psi). The resistance should be 88 ohms +/- .5.








posted by 62.79....

Link to excellent townsend site apc guide!

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