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It's not the wire that goes to pin 2 Posted by Bill Homer [Email] (#3427) [Profile/Gallery] (more from Bill Homer) on Thu, 13 Nov 2008 11:13:21 In Reply to: Base boost tribulations, Steve C., Thu, 13 Nov 2008 10:17:52 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The APC fuse is in the path of the wire that goes to pin 2 of the BPC valve; this wire provides a +12V (nominal, goes up to +14V when the car is runing) source that energizes the two coils of the BPC. Two of the transistors that were replaced act as "switches" that provide a path to ground, energizing one coil or the other for a variable amount of time through Pulse Width Modulation (PWM); varying the width of the pulses is analogous to turning a valve that allows a variable amount of boost - if one side is energized 100% of the time, it will act like the valve is fully open.
For the measurements listed, I assume that you are measuring between the pin on the wire harness plug and ground. The fact that you are getting a relatively low resistance on Pin 1 (I think that it should be in the mega Ohm range) and no measurement on Pin 3 has me concerned. Are you sure that the transistors were the correct ones, inserted in the correct way?
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