

| Subject: | Re: Bentley question regarding Idle Speed Stab. valve troubleshooting |
| From: | David Beierl |
| Date: | Tue, 22 May 2018 18:22:53 -0400 |
> > No problem other than it doesn't vibrate. I thought I read somewhere that > vibration or the lack of it is not a true test on later Vanagons. Any one > know if this is true? > They all vibrate, because the drive signal is around 250 hertz PWM (Pulse Width Modulated) to simulate varying drive voltage. At some point they changed the harness so that it doesn't run continuously when you just turn the key on. Yrs, d
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