prof

As per the title - and I've searched...

I've wired in an eManage and one of the signals that's intercepted is the AFM signal. Measured voltages from the AFM and going to the stock ECU from the eManage and all seems fine, but after driving the car, and checking for errors, there seems to be an error code 08.

I've read that this results in fixed fuelling and ignition timing - and the car feels like something has happened to the timing. My question is does the AFM error result in this 'lock down' until the ECU is reset or does it only persist for as long as the error condition occurs ?

I assume that the signal from the eManage is outside spec either at startup/shutdown or at some point, although it seems to track perfectly with the map set to all 0's (signal passed through unaffected), and that's what causes the error.

HAILERS

Make sure you don't have the inputs and outputs crossed - the input wire to the E-manage should go to the wire going into the wire harness, and the output should go to the wire that goes to the ECU.***************************
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I stole that idea from doing a serarch for emanage (I also tried E-Manage, some can't bother to spell right). It was in a thread on the Engine Managment Forum on this site. Dale Clark was the owner of the thread but it's an old 2002 thread.

I'd GUESS it's going to stay with Basic Fuel Injection Amount and Fixed Ignition Timing until the problem if fixed. I'd be curious about if you reset the computer and then just turned the key to ON, if the code 08 shows up right away or not. In other words without the engine running, just key ON.

I know close to nothing about E-Manage. I'm on a learning curve starting with this thread: http://www.mohdparts.com/emanage/EmanageFAQ.txt

HAILERS

If you don't get a good response from your thread here, then take a look at this thread: https://www.rx7club.com/showthread.p...light=E-MANAGE

The fellow DaleClark on that thread says he answers questions about E-Manage. He seems to be a E-Manage advocate. Check those two wires mentioned above first.

prof

Thanks for the replies Hailers.

I'm pretty sure I've checked my wires - but I'm going to go over it again, as I found at least 1 wire incorrect before. I'm using my own harness - designed so that I can plug it back to stock if I want to take it out any time - I just unplug the various in's and out's and route everything back to the stock ECU.

Incidentally - the error code doesn't show up if I just power the ECU up and down - any number of times - which leads me to believe it must occur once the engine has cranked and started (might even be the cranking).

I found one of your threads earlier about the AFM and limp mode - and it doesn't seem as drastic a limp mode as the OMP failure - but it's certainly causing an issue.

I'm going to try and check the timing, with it in and then out of circuit - make sure the eManage isn't doing something on it's own.

The documentation for the product is at best 'passable' - but it's only through people on the forums that anything useful can be found in terms of how to wire it for certain cars, and tuning tips. There are plenty of errors in the documentation as well - which has led to MX5 owners having burnt out coil packs among other things.

I may end up wiring the AFM back to the stock ECU permanently as I don't need to use the adjustment map to start with or the AFM replacement map until I hit bigger power levels, and as the target is 300 RWHP may not need to use those maps at all - but that seems like a kind of defeat

Thanks,

Prof.

DaleClark

iTrader: (55)

My E-manage expertise is getting REALLY old, but here's a few pointers.

The stock ECU is INCREDIBLY dumb. If it's getting a code for the airflow meter, it's either a) not getting a signal, or b) not getting the signal it expects. That's about it.

First, bypass the E-manage - hook the AFM wire back up so it doesn't loop through the E-manage. Disconnect the battery to reset the ECU codes (disconnect negative terminal for at least 30 seconds, and press the brake pedal to help clear out any stray voltage) and fire the car up. If the car starts and runs fine with no code, the AFM and wiring from it to the ECU is OK. If not, start troubleshooting that.

If that works, wire the E-manage back in. Make sure to pay attention to which wire is input and which is output - it's easy to cross them. Also make sure to use the right wires for a flapper door style airflow meter. Then, make sure the E-manage is set up for the proper airflow meter - a flap type, and the correct "number" for your car/AFM.

There's also an E-manage forum out there (I think it's emanageforums.com) that might be worth looking into for further help.

Again, I DO NOT have an E-manage any more (or an FC for that matter) and am by no means current on this stuff - I've forgotten a lot of it, actually. But, it's just down to good ol' basic troubleshooting.

Dale

prof

Although it's a vert, it's a TII - Series 5 engine - so I have the cone type air meter. (We got the tubby engine over in the UK )

The car has been running fine with all the connectors patched through to the stock ECU, it was just time to take it to the next stage and have it all routed through the eManage. I just need to understand what might cause the error, and when - then perhaps I've a chance of preventing it.

From what I know, the AFM gets a 5V reference signal from the ECU - that still happens - and this is on one end of a variable resistor track - the other end grounded. The wiper contact is the AFM output signal, which I am intercepting with the eManage and the Airflow output signal from the eManage goes into the original ECU in place of the air meter. When the cone is moved in/out, a variable voltage is seen on the input to the eManage, and the same voltage is appearing on the output. It all seems to be ok, but I haven't had a scope on it whilst driving - so I don't know what the signal is doing from a dynamic point of view, or during cranking.

I suppose it's also possible that I've got the wrong Air meter selected - MZ-FL-2 is what's displayed - and it doesn't seem selectable - can you remember what type you had Dale? If you have an old config file saved, I could load that up and take a gander.

prof

A little update - I checked the error codes again today - seems the 08 error has now decided to go, but the car still felt like crap - no acceleration - timing all wrong and running rich.

I checked the wiring again - everything ok there - also checked the voltage coming from the AFM and going to the stock ECU (input and output on the eManage) and the 2 voltages were about 0.04 volts apart and tracking perfectly when the AFM cone was pushed in and out.

In the end I routed the AFM signal back to the stock ECU - bingo - timing went back to normal

I have no idea what's going on here - as the signal seems to be fine - but the eManage is screwing up timing (checked with timing strobe) whenever it's providing the AFM signal.

Ernesto13B

iTrader: (4)

Basically once it go's into limp mode, it will not go away by itself and will only go away if you reset the ecu by disconnecting the battery and pressing the brake pedal for about 30 seconds. If you have already reset the ecu and its still doing the same thing, then it means its getting a signal from somewhere it doesn't want to see, and its "protecting" the engine by putting it in limp mode. Coiuld be something as small as a loose vaccum/air hose somewhere? That was the problem I had, and after I connected it, and reset the ecu everything was fine.

prof

I thought that too, but when I checked for error codes, it was only showing a MAP error (13) and not the AFM error - I did the reset, and tested again for codes - none - so then went for a run in it - it felt crap - so stopped and checked error codes - still only the MAP error.

I then decided to swap the AFM back to the stock ECU, and run a signal in parallel to the eManage - so the AFM was feeding both units - and the problem goes away - so it's not hoses / sensors or anything like that - just seems the eManage is altering timing when it provides the AFM signal