Mercedes Ke-Jetronic - Connector setup for measuring mA on the EHA. The demonstration of the most important phases on the EHA. The ECU processes all the data which it receives from the sensors and sends them to the EHA as well as to the idle control valve. The first one is for fuel and the second one for air. This is the point of the electric part of the KE-Jetronic system. In this video i am showing you how to make a connector with help of which you are going to measure mA on the EHA valve. These data can tell you if everything is in order with either the EHA or the ECU as well as about the fuel quantity which the fuel distributor is sending towards the cylinders as well as about the correct nominal values of the phases through which the system is going through - the ignition on, cold start phase, warming-up phase, warm engine on idle, acceleration phase and the cut-off phase, so enjoy the video!
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Time code
0:00 Intro
0:09 - 0:26 About the video
0:27 - 1:43 THANKS/JOIN/Patreon
1:44 - 5:29 The continuation of the video
5:30 - 9:00 Connecting the connectors with cables
9:01 - 9:05 The connector on the car
9:06 - 11:12 Ignition ON with my explanation
11:13 - 12:52 The Cold start phase with my explanation
12:53 - 14:47 The Warm-up phase on idle with my explanation
14:48 - 15:36 The Acceleration phase improvisation
15:37 - 16:07 The cut-off phase with my explanation
16:08 - 17:20 The repetition of all phases
17:21 - 18:07 My girls and me ending the video!
What am I talking about?
My topic is the KE-Jetronic injection system which I try to demystify as much as I can.
For all of you to understand the system in brief - Developed in 1973 and being mounted into cars up to 1993 as it went in history. But why these to letters!?(KE) K(from German "kontinuierliche Einspritzung" meaning continuos injection, without interruption) the MECHANICAL injection system on which the fuel starts flowing from the fuel tank sucked by the FUEL PUMP and delivered to the FUEL DISTRIBUTOR which sends fuel to the INJECTORS while the majority of it flows through the FUEL PRESSURE REGULATOR through its return line back to the fuel tank again. The letter E(elektronische Gemischanpassung/electronically controlled mixture adaptation) has to mark the electronic sensors (the developement starting from early eighties) which had to inform the ECU about the current state of the engine so that the ECU(Electronic Control Unit) then could create current signal in mA(miliampers) and send it to four crucial components for the system - the EHA(the electro-hydraulic actuator, a unit consisting of a magnet, an electromagnet and a baffle plate) which had to fine tune the engine in each of its phases, the ICV(the idle control valve), the unit which was predicted for the engines perfect idle, the X11(the diagnostic socket) where the duty cycle(the ideal mixture) was adjusted and the X11/4(the code reader) - the socket which from any codes were read if present using an OBD1 scanner.
An extraordinary injection system which could be fully repaired in your own garage using a multimeter and a pressure gauge only for its fine tuning, together with some common tools.
"Happy Mercedesing"