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Ive got a 1999 vortec 7.4 and when i try to relearn it it…

Customer Question
Ive got a 1999...

Ive got a 1999 vortec 7.4 and when i try to relearn it it wont except it.i had the ecm reprogrammed and also put in a new crank sensor as well. I dont have a rev limiter on it and im wondering if thats why i cant do the relearn.

Mechanic's Assistant: Does the vehicle stall at low speeds? Does it sputter?

Long story short but i put this motor in my 68 pickup and am just now getting it going for the first time. it does have a miss at 2500-3500

Mechanic's Assistant: What is the model of your '99 Chevy?

Its a l29 7.4 liter it came out of a 99 2500 chevrolet

Mechanic's Assistant: Are you fixing your 2500 yourself? What have you tried so far?

Set the timing at 0 with snap on scan tool and tryed to do a relearn but it wont except it

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

New distributor, remapped ecu with the rev limiter and new crank sensor

Submitted: 9 months ago.Category: Chevy
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Answered in 8 hours by:
9/19/2017
Chevy Mechanic: GM Bob, ASE Certified Technician replied 9 months ago
GM Bob
GM Bob, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1,226
Experience: 30 plus years. experience as GM technician, ASE Master Technician and GM Certified.
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Hello! My name is***** to JustAnswer.

The ECM needs to see that the park brake and brake pedal are on.

Important: After the ignition switch is turned to the CRANK position, the VCM must see a change in the state of brake switch (Released to Applied) to run the learn procedure. Also, the service brakes, and the parking brake, must be held throughout the duration of the learn procedure.

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    Chevy Mechanic: GM Bob, ASE Certified Technician replied 9 months ago

    What did you use for ECM wiring?

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    Customer reply replied 9 months ago
    I used a wiring harness from street and performance. There are also the ones that did my ecm. There is no wiring hooked up to the brake system besides for lights which would have nothing to do with signal to ecm. The scanner does show the brake is being applied but I assume it's a open circuit.
    Chevy Mechanic: GM Bob, ASE Certified Technician replied 9 months ago

    Do you have the VIN from the truck you got the engine?

    I need to do some research may take some time.

    Is that ok?

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    Chevy Mechanic: GM Bob, ASE Certified Technician replied 9 months ago

    I found the schematic of the brake input.

    https://www.dropbox.com/s/s5sdxb4sk6oomou/1999%20brake%20switch%20input.pdf?dl=0

    The input goes open when the brake is applied.

    On your scan tool does it show what gear the trans is in?

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    Customer reply replied 9 months ago
    It sure doesn't. Still using the 68 steering column
    Chevy Mechanic: GM Bob, ASE Certified Technician replied 9 months ago

    So you are telling me your scan tool does not display shift inputs?

    I was thinking if street and performance set up the ECM. They may have set it with trans in park and brake switch applied.

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    Chevy Mechanic: GM Bob, ASE Certified Technician replied 9 months ago

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