Infinity Output Testing | AEM
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rikgray
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Infinity Output Testing

How would I test the outputs of the Infiniy?

Specifically I have a random misfire, and I would like to eliminate the ECU driver outputs as a problem.

Most likely is the coil trigger signal, then next would be the injector drive signal.

sportbikeryder
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Joined: 05/23/2014 - 05:39
The infinity platform does

The infinity platform does have a diagnostic mode, however it requires a complete firmware change to use and is not available in a firmware that will actually run an engine. 

 

In order to test, the "Diagnostic" firmware needs to be flashed into the ecu, and then the diagnostic output checks and a processed crank and cam signal plot can be evaluated. Note, in the context of VR Trigger signals this is not an actual scope of the cam and crank triggers, rather a post processed digital interpretation as the infinity hardware preprocesses the signals. 

After testing, the standard firmware must be reflashed to the ecu in order to run an engine. 

John

AEM_SB
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My suggestion is using the
If you're not sure which cylinder is misfiring, try using the 'Coils/Injectors' page of the wizard to disable each injector while the engine is running at a high idle. Disabling individual outputs on a running engine not only checks that the ECU is triggering the output but can also help track down if your calibration's settings for cylinder firing order matches how the vehicle is wired. Some engines will stall when you disable a cylinder, so you might need to raise the idle target or give it some throttle to keep the engine running.
 
This example screenshot shows how you would disable the injector 5 output from the ECU.
 
Each time you disable one injector you should hear the engine misfire and see that bank's O2 sensor show a lean reading. If you disable an output but the engine runs the same and the lambda trace doesn't change, that's a good indicator that something was not working properly.
 
 
 
As mentioned by Sportbikeryder, flashing the Diagnostics .pakgrp file into the ECU will let you trigger each output individually with the engine off. Be sure to save a copy of your calibration file first, you will need to load it back into the ECU after flashing back to the normal firmware that runs the engine. After loading that Diagnostics pakgrp file, go to Wizards >> Output Diagnostics, then use the interface to pick which output you want to trigger. The output will trigger after you press the 'Trigger Output' button in the software.
 
 
 
Hope that helps,
SB
cutlassefi
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After loading that

"After loading that Diagnostics pakgrp file, go to Wizards >> Output Diagnostics, then use the interface to pick which output you want to trigger. The output will trigger after you press the 'Trigger Output' button in the software."

I'm guessing as this should be an LS output that I'd need to have 12v attached to the other end of this pin out in order to check it?

Thanks.

AEM_SB
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Yes, you would need something

Yes, you would need something connected to see most of the LS output pins work. Some of the LS output pins have a 12V pullup resistor, the ECU pinout notes in the Hardware Specification documents should note which ones. 

 

Also note that this mode will send a very short pulse to each pin, it's about 3-5ms. That should be long enough to hear a fuel injector click or jump a spark across a spark plug, but it's short enough that you won't see much if using a multimeter to measure DC voltage.

 

Hope that helps,

SB

cutlassefi
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This would be pin 52 on a 308

This would be pin 52 on a 308 correct? Connected as desribed in the instructions then I should see a spark across the spark plug? Didn't see it before, I'll try it again.

Thank You!

cutlassefi
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AEM_SB wrote:

AEM_SB wrote:

Yes, you would need something connected to see most of the LS output pins work. Some of the LS output pins have a 12V pullup resistor, the ECU pinout notes in the Hardware Specification documents should note which ones. Also note that this mode will send a very short pulse to each pin, it's about 3-5ms. That should be long enough to hear a fuel injector click or jump a spark across a spark plug, but it's short enough that you won't see much if using a multimeter to measure DC voltage.

Hope that helps,

SB

Just tried diagnostics on a 308. Unfortunately it does not show all of the pins on this model, quite a few are missing from the diagram/table, most importantly C1-52, the one I needed. Were you all aware of this and how soon for a revision? I moved left, right, right clicked, left clicked, no way to activate pin 52. Did I miss something?

Thanks.

cutlassefi
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AEM_SB wrote:

AEM_SB wrote:

Yes, you would need something connected to see most of the LS output pins work. Some of the LS output pins have a 12V pullup resistor, the ECU pinout notes in the Hardware Specification documents should note which ones. Also note that this mode will send a very short pulse to each pin, it's about 3-5ms. That should be long enough to hear a fuel injector click or jump a spark across a spark plug, but it's short enough that you won't see much if using a multimeter to measure DC voltage.

Hope that helps,

SB

Just tried diagnostics on a 308. Unfortunately it does not show all of the pins on this model, quite a few are missing from the diagram/table, most importantly C1-52, the one I needed. Were you all aware of this and how soon for a revision? I moved left, right, right clicked, left clicked, no way to activate pin 52. Did I miss something?

Thanks.

AEM_SB
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The signal for C1-52 (Coil1

The signal for C1-52 (Coil1 High Output) is tied to the signal for C1-14  (Coil1, 0-5V falling edge), sorry for the confusion. Both pins will fire when you tell the software to trigger C1-14. Note that C1-52 on the Infinity- 308 ECU basically acts like an ignitor, it will send switched ground to charge the primary winding of the ignition coil.

 

Hope that helps,

SB

cutlassefi
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Hmmm yeah, you think maybe

Yes it does, and that's what I'm trying to do with it, drive a single coil/distributor setup. But with all due respect do you think maybe you should put that little note in there somewhere? Wasted half a morning trying to find that. You guys might need to work on the "assumed" info a little. ;)

Thanks.