Drive By Wire HELP!!!
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From: Minnesota
Drive By Wire HELP!!! I swapped in a 2007 6.0 4l80 from a express 2500 van, The pedal, tac module and pcm are all from the van that I drove home. I purchased a new harness from Speartech and had them program the computer. I have it all installed in my truck and it starts and runs normal but after running for about 15 seconds it will do nothing but idle. There are no codes and I cannot find anything wrong. I sent the computer, tac module and harness along with the pedal back to speartech and they said it ran and worked normal on their engine. This engine ran mint in the van, I drove it home. I have tried a new throttle body and find nothing wrong. I need help to get this thing on the road. I have tried a direct power and ground to the battery and nothing seems to change it. No codes in the computer at all.
Help Please
Tim
Help Please
Tim
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From: Minnesota
Vats and all emissions bs is disabled and removed from the harness.
Another thing I just noticed is that the check engine light is not on key on engine off. I always thought they were?....
Another thing I just noticed is that the check engine light is not on key on engine off. I always thought they were?....
Unplug the petal and see if it sets one of the app codes. Unplug the throttle body and see if it sets the codes. If it doesn't then the TAC isn't talking to the PCM. With the key turned on and the motor not running will the pedal operate the theottle plate. Yes when you turn on the key with the motor off, the check engine light should come on.
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From: Minnesota
Thanks for the help pacer. I just went out and tried it. The throttle moves when you push the gas pedal With the key on engine off. The check engine light key on engine off is interment. I get a check engine light and correct codes when I unplug the throttle body or the pedal with the truck runing. If I start the truck initially it will Rev crisp,if I let it idle it will dead pedal.RPM has little change if floored. If I start the truck and hold rpm at 2000 for 15 seconds it will Rev and I could drive it. It seems to be down on power but at least the pedal works till I shut it off then it resets. No codes ever.
I am at a loss.
I am at a loss.
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Thread Starter
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From: Minnesota
I think it is reduced powe mode but I have no idea what is causing it. I drove it 65 miles today. If I hold the idle up for 15 seconds and go I can drive it, it is way down on power and merging is tricky but once to speed it drives ok. If I step into it it down shifts normal just does not accelerate like a normal car. It seems a little better if I use the cruise control. I just wish I could figure out the cause. Still no check engine light.
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Thread Starter
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From: Minnesota
This is all installed in a 1970 International Travelall and both speed sensors are hooked up. Trans shifts great, just low on power or no power if I let it idle after started. I I start the truck and just let it idle, the tone of the engine will change after about 15 seconds of idlle. Then I can floor it and it will only Rev to about 1800 rpm.
With key-on/engine-off can you operate the throttle blade through its full range with the pedal?
If you leave the key on for 15 sec, without touching the pedal, it should go into battery saver mode, which cuts power to the throttle motor if there is no RPM detected. You may hear a slight click as the blade returns from the cranking position to the spring-held position. You should then be able to move the blade freely by hand to confirm this. If you touch the pedal again, throttle operation should resume.
If you leave the key on for 15 sec, without touching the pedal, it should go into battery saver mode, which cuts power to the throttle motor if there is no RPM detected. You may hear a slight click as the blade returns from the cranking position to the spring-held position. You should then be able to move the blade freely by hand to confirm this. If you touch the pedal again, throttle operation should resume.
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With key-on/engine-off can you operate the throttle blade through its full range with the pedal?
If you leave the key on for 15 sec, without touching the pedal, it should go into battery saver mode, which cuts power to the throttle motor if there is no RPM detected. You may hear a slight click as the blade returns from the cranking position to the spring-held position. You should then be able to move the blade freely by hand to confirm this. If you touch the pedal again, throttle operation should resume.
If you leave the key on for 15 sec, without touching the pedal, it should go into battery saver mode, which cuts power to the throttle motor if there is no RPM detected. You may hear a slight click as the blade returns from the cranking position to the spring-held position. You should then be able to move the blade freely by hand to confirm this. If you touch the pedal again, throttle operation should resume.
It should not if the PCM sees an RPM signal. That is why I said to test that it actually comes back out of that mode after it enters it...to see if it is working normally.
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From: Minnesota
It functions normal koeo. It will go into battery save and I can manually open the throttle, if you touch the gas it is back on and normal. Works idle to wide open. Is that something that can be shut off in the tune? It seems like my problem with the 15 second delay and all.
What is letting it or could be causing it go into battery save when running?
Thanks for the help!!!
What is letting it or could be causing it go into battery save when running?
Thanks for the help!!!
I don't think it is the battery saver mode if the throttle re-enables when you touch the pedal.
Sounds like there is some other issue disabling the throttle after the engine is running. Should be codes set though, unless they have been set to "not reported" in the tune. Can you log the throttle position to see it is defaulting to the spring-determined position of 18-20% and not responding to the pedal?
Sounds like there is some other issue disabling the throttle after the engine is running. Should be codes set though, unless they have been set to "not reported" in the tune. Can you log the throttle position to see it is defaulting to the spring-determined position of 18-20% and not responding to the pedal?
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From: Minnesota
Got it fixed today with the help of Lancer automotive in St Paul MN. There was a çarupt file in a abuse table ended up with a new used pcm reflash and some tuneing. Runs like a top now.
Glad you got it working.
Couldn't have worked on Speartech's engine either then, if everything was hooked up the same.
Not sure how you have the brake input wired into the PCM, but if brake torque management(BTM) was enabled(factory setting) in the tune, RPM will be limited to around 2000 if the PCM thinks your foot is on the brake. This is an anti-abuse setting. Don't think this applies in P/N though.
Couldn't have worked on Speartech's engine either then, if everything was hooked up the same.
Not sure how you have the brake input wired into the PCM, but if brake torque management(BTM) was enabled(factory setting) in the tune, RPM will be limited to around 2000 if the PCM thinks your foot is on the brake. This is an anti-abuse setting. Don't think this applies in P/N though.
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From: Minnesota
Thanks for the help drx. I am positive it did not work on speartech's engine. I think they did nothing with it when they had it.
I installed the pcm in anther LSX car and it did the same thing as my truck on sunday night. That is when I was positive it was either in the tune or the pcm itself.
I installed the pcm in anther LSX car and it did the same thing as my truck on sunday night. That is when I was positive it was either in the tune or the pcm itself.