Low voltage at hall sender plug - 85 Digijet

[3xvanagon]

Hi all,

1985 vanagon , swapped to a 2.1 running digijet. Been having no start issue, cranks well.

Diagnosing via Bentley has be probing the outside terminals at the hall plug near distributor with key on. I understand I am meant to see 5v+, I am seeing .6v. It seems to be associated with the ground circuit as if I jump from the positive side of the hall sender to the engine case, I get over 11v.

Any thoughts on where that ground circuit terminates? I have cleaned all the grounds and new connectors on the tree at the driver's side head. No change.

Would it be an awful idea to splice the ground circuit off the hall plug and jump both sides to the ground tree at the engine head (thus ensuring a good ground circuit)?

Any ideas appreciated.

Brian

[Vanagon Nut]

If you don't have this, the Digijet Protraining manual link can be found in stickies or elsewhere here.

edit.

If I understand your question on this.....

partially a gut instinct, but I'd say "no" to connecting a temporary ground wire to ground wire at distributor hall generator connector.

Hall ground *seems* to be switched on, off by ECU (pin 1) and-or at other parts pre distributor hall. Yes that ground connection is most likely "constant" when ECU energized but effectively back feeding a ground may not be good.

A note: if your Digijet system has the later style "single" throttle switch, the connector for that and aux air valve are the same. If mixed up, they can cause a no start or at least a poor run condition.

Neil.