You may want to pick up a cheap vacuum test kit to see if there is sufficient vacuum at the turbo. Check all pipes for leaks.
The solenoids will only get voltage when the ECU wants a vacuum (or not, don’t know which way it goes).
On startup, my EGR vacuum was “sucked” then eased off after a few seconds (10-20)
On startup/idle, my turbo vacuum was sucked and stayed sucking till the van wanted to change its position.
So, on my van, after say 20 seconds, as EGR vacuum request is “off” and Turbo vacuum request was “on”, I’d expect different voltages at the solenoid as they are doing opposite things. Its all from the ECU. Easier to test with vacuum kit.
Symptom #2: At temperature settings between LO and HI, the vent air temperature fluctuates wildly, or takes very long to respond to a user setting.
Possible cause: The In-cabin Temperature/Humidity sensor could be faulty, or just dirty. This sensor is located just above the ignition key lock area. Carefully pry off the small plastic grill to expose the sensor. Use an air can to blow out the dust, and use a sensor-safe electronics cleaning spray to clean the sensor. If the situation improves after this, but not enough, then the sensor may need to be replaced. A lot of parts need to come out in order to get access to the sensor, so it is not a quick and easy job to replace this part.
Sign Up to Receive Review Newsletter : Includes 'How To' tips, special sales, and more.
Disclaimer for Review Articles:
The information and articles provided in this e–monthly and/or in any publications provided by are for general purposes only and intended to help you make better decisions about your boat and boating equipment. Such information is not intended to substitute for instructions from the manufacturer, dealer or marina about your specific boat or boating equipment and iboats specifically disclaims any liability for damage to your boat or equipment arising from your following suggestions in this e–monthly. For more details about your equipment or application, we suggest you contact the manufacturer of your boat or other equipment.