Volvo D-jetronic with "123 distributor", two output signals displaced 360 degrees. Works on both 4 and 6-cylinder engines.
Information
The classic D-jetronic has two injection banks (hence two injection signal wires). A falling edge on the D-jetronic wire triggers the active bank.
So if bank 2 was selected (yellow wire) and the white wire (bank 1) has a falling edge, the active bank will change from 2 to 1.
During ever bank transition, the new active bank will inject.
So it does not matter if you give 1, 2 or 3 pulses on the white wire, only the first pulse will trigger injection into that bank.
Volvo D-Jetronic distributor.
Volvo D-Jetronic trigger oscilloscope image.
Trigger pattern
4-cyl:trig-trig-home-home pattern.
6-cyl: trig-trig-trig-home-home-home pattern.
Disclaimer
This is not a great trigger. If it's highly tuned we recommend a 60-2 or 36-1 crank trigger setup instead. Distributor triggers have problems with belt and gear slop and this one will also have some error due to the alignment between the 2 sensors.
A missing tooth crank trigger will start faster, have a more stable ignition angle, and better transient response.
Note
•Trig och home must use the same polarity setting.
•Check the RealTime Data value "RPM FAST" and make sure it is stable on idle.
