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Actual ohm readings off APC pressure transducer
Posted by DET (more from DET) on Mon, 1 Apr 2002 08:43:02
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Been trying to resolve "issues" with my 87T and a clicking APC solenoid.
Successfully adjusted base boost with wastegate rod from about 2.5psi to
5.5 psi.
Found one of the pair of cruise control switches (brake pedal) was intermittent with continuity, say every other brake release. Thankfully SAAB put a connector plug underdash so you can easily get resistance readings of the pair installed. Good design, disassembled switch, wet sanded contacts & viola shes a working now.
I have had the famous "intermittent" clicking APC solenoid problem. Most folks herein say the pressure transducer which feeds back to the APC is the culprit. Voltage & ground to solenoid is OK.
Using the MITYVAC, and calibrated gage, I get these readings at transducer:
0 psi = 13.5 ohms
2 psi = 35.0 ohms
4 psi = 57.0 ohms
6 psi = 74 ohms
8 psi = 91 ohms
10 psi = 99 to 103 ohms
The weird thing about these readings; test pressure stabilized immediately, but the ohm readings (using good digital VOM) bounced alot, then stabilized. Not being an electrical guy, but this still seems wierd to me.
From my Bentley, the values read are in the neighborhood of what is says to expect.
Last roadtest yesterday, saw boost into the low 10's, so something is working. However the annoying clicking APC solenoid persists....
Any wisdom would be appreciated!
DET
90S
87T
90 SPG (soon I hope)
posted by 32.97.2...
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