Originally Posted by toofast928

Open loop is determined by coolant sensor. About 140 coolant temp the L jet takes in accout o2 sensor.

L Jet also needs idle switch input (for fuel cut) and WOT switch input (where o2 is ignored).

L Jet is very crude, if you need to see if in open loop, then use a scope and DUTY cycle the injectors, compare to o2 wave form.

Tony

Originally Posted by Jack Riffle

Ok, here's the deal...I will send a case of beer to the FIRST guy (or girl) who can give me the correct answer to this question..... Is there any way to tell when the L-Jetronic is running in closed loop or open loop? Bonus beer awarded if you can also correctly identify which wires go where, where the wiring harness plugs into the MAF. Specifically, I need to know which wires go to the fuel pump relay, and the MAF output and ground. Any takers??

Originally Posted by Jack Riffle

No, let me re-phrase that....the beer goes to whoever can tell me HOW to know when the car is in closed loop or open loop.............Whew, that was a close one......

Originally Posted by Jack Riffle

Ok, i need the pinout for the AFM not the MAF......get that one and name your brand Mark.

Originally Posted by Jack Riffle

Ok, I guess I need to be VERY specific...I need to know which wires ( at the plug to the AFM) are the air temp sensor (built into the AFM) which ones for the fuel pump relay, which ones the output for the AFM, which one is the switched 12v+ to the AFM, which one is the AFM ground.

Originally Posted by Jack Riffle

John, Thanks for trying, but, no that drawing doesn't really help. I know there are 5 wires that attach to the AFM. I know where the wires go to the ECU. I know their pin locations and their color codes. What I don't know is exactly what information each wire is sending to the ECU. Bosch has a technical Hotline and I have been on the phone with them. ( great people) They are researching it for me right now and said they WILL have the answers. We'll see.......I will post the info here if and when I get it. Again, Thanks to everyone for their help.

Originally Posted by Jack Riffle

Thanks DR. You are right on the money! Pin 6 on the ECU is ground (yellow with red strip). Pin 7 is the signal from the AFM (Green with red stripe). Pin 8 sends a signal to the ECU from the AFM in case of malfunction( green)Pin 9 carries a reference voltage from the ECU to the AFM, typically between 7 and 9 volts(Blue with green stripe) Pin 27 is the air temp signal from the AFM to the ECU.

These are not guesses. I just got off the phone with Bosch Tech Support. If anyone should need it in the future their number is...800-521-5462.

Thanks again to everyone who made an effort to help You guys are why Rennlist rules

Originally Posted by Jack Riffle

That's what I said Mark



And that's what I said Mark

Might have to negotiate down to a twelve pack......Pick your Poison..