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Old 04-26-2021, 06:29 PM   #1
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ISL Cruise Cancel function

I have a 2007 build year DPF engine, ISL, CM2150 ECU. I've discovered two service brake signals to the ECU. One is generated by the Actia brand dash gauge cluster & broadcast via J1939 to the ECU stating service brake active. The second is a solid state relay that connects ECU OEM Pin 24 to chassis ground.


Question: Does anybody know how the ECU collects a Cruise Control Cancel instruction? I'm guessing either of these two could be used for that, but why there are two signals is bugging me that maybe there are two separate uses for Service Brake ON signal and I can't figure out what the other one is (or maybe more than 1 other). Maybe Jake ON if some parameter is set to mirror Jake ON to Service Brake ON? Seems that could be invoked off a single input.
Thanks in advance for whatever info you've got.
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Old 04-26-2021, 06:48 PM   #2
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I can't say exactly how your system processes the info , but I do know why there are redundant systems to cancel cruise operation .

My vintage system uses two air brake pressure sensor , (brake light switches) one in front brake system, one in the rear brake system, to feed into the wiring and cancel cruise . Because the last thing you need when you apply the service brakes is the engine going WOT ( Wide Open Throttle ) to try and maintain speed.

I guess if both fail .... we're on our own , find the cancel button FAST.
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Old 05-13-2021, 05:27 PM   #3
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I have asked several very technical questions at this site. No responses. You'll probably have to get professional advice.
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Old 05-13-2021, 07:46 PM   #4
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This forum does give answers to some highly technicsl questions ? [Mod Edit]
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Old 05-16-2021, 07:08 AM   #5
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The brake pedal position switch detects the position of the service brake pedal. Certain features such as cruise control and PTO respond to the state of the brake pedal position switch and disengage when the brakes are applied. The circuit has a normally-closed switch, switch return wire, and brake pedal position switch signal wire of the OEM harness. The brake pedal position switch is mounted in the low pressure side of the vehicle pneumatic brake system. When the vehicle brakes are applied, the normally closed switch opens and disables the cruise control operation.

This doesn't answer your question but shows the complexity of the ECU and the vast amount of inputs, parameters and data it uses. This is for my ISX 15L 600HP engine.
https://www.irv2.com/forums/download...do=file&id=346
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