Mk2 - Electrical

KE-Jetronic (or "CIS-E", which means "Continuous Injection System with Electronic control") is a variant on the much more basic Jetronic system. It uses the same ignition controller, but comes with a much more advanced oxygen sensor computer, and sometimes a knock sensor computer as well. It has several wiring variations, depending on the year, model, place of assembly, etc. It was used on various Golfs, Jettas, and GTIs (including 16vs) from 1985-1989. It was replaced by Digifant II on Jettas in late 1987, and Golfs in 1988, but it survived on 16vs until 1989. It had very primitive fault diagnosis (only on cars equipped with a knock sensor). There was no fault memory. Operating theory is a bit more advanced then basic Jetronic. While a vane meter fuel distributor still is used for basic fuel metering, a new Differential pressure Regulator is also used to fine-tune fuel control electronically. Coolant temperature, oxygen content, and basic throttle position (idle or WOT) are all taken into consideration. Knock is taken care of via a specialized controller (GTI/GLI only) that senses knock, engine load, and timing, which is adjusted to eliminate knock. The differential pressure regulator current can be the most telltale test applied to a Jetronic or Motronic vehicle to diagnose it's operating condition (provided everything else is in working order).