I have no throttle responce dbw - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bulldog88 · 06-04-2016, 01:37 AM

I have a dbw that's not working, truck starts and idles fine but i have no throttle,I have checked wiring and made sure pins are in the right spots, changed pedal, tac (pedal box) even throttle body and it won't work, ecm and engine came from 2004 truck. Any ideas?

clemsonteg · 06-04-2016, 09:29 AM

Did you modify the harness or did you put a swap specific harness?

Bulldog88 · 06-04-2016, 01:14 PM

Speartech did the harness and ecm programming

BR3W CITY · 06-04-2016, 01:36 PM

Before I blame the tuner (which I will, just not yet).

Scan for codes; are you throwing any P or U codes?
Check the purple and yellow wires off the throttle body, and make sure they haven't pulled out of the connector or broken.
Reset the battery, try again. Do you get throttle response even a *single* time?

Because you said you've replaced parts; where did they come from? Having as closely matched set of TB, Pedal, TAC, ECM, is ideal. If you start throwing parts at it, you can actually ADD problems instead of taking them away. What year did the pedal and tac come from?

Bulldog88 · 06-04-2016, 03:04 PM

The tac and pedal that I put on it came from a 2001 suburban that my brother let me use, I haven't scanned for codes yet

**truckdude239** · 06-04-2016, 04:04 PM

2001 did not have dbw , so it could not have been from a 2001 suburban

Bulldog88 · 06-04-2016, 04:53 PM

Yes it does I'm sitting here looking at the truck 2001 suburban

foamypirate · 06-04-2016, 06:49 PM

Quote:

Originally Posted by Bulldog88

Yes it does I'm sitting here looking at the truck 2001 suburban

I'm pretty sure an 01' TAC and Pedal will not work with an 04' PCM. You need an 03-05' pedal and TAC.

ls1nova71 · 06-04-2016, 10:43 PM

Quote:

Originally Posted by foamypirate

I'm pretty sure an 01' TAC and Pedal will not work with an 04' PCM. You need an 03-05' pedal and TAC.

^^^^^^ This. But I'm 100% sure that the all plastic TAC from a 2002 and older engine won't work with an '04 PCM. You will need a TAC from a 03-05.

**truckdude239** · 06-04-2016, 10:48 PM

I guesz im wrong but ive never seen on i service alot of these at work and pre03 all i have ever seen are dbc

72MARIO · 06-04-2016, 11:09 PM

David...

from what i have seen the trucks and suvs with traction control got dbw there definitely were not many that came dbw. Hope that might explain why you havent seen any.

.

**truckdude239** · 06-05-2016, 10:15 PM

That would make sense

Bulldog88 · 06-06-2016, 07:49 PM

Fixed the issue guys, tac module was wrong, I had to go another one so I picked up a 04 model, also there was a faulty wire from the tac to pedal, did some soldering and now it runs like a champ

BR3W CITY · 06-06-2016, 08:05 PM

Glad you found it. So just so we're clear for guys reading this; the 2001 TAC you borrowed (however unusual) did NOT properly interchange with your 2004 pedal/tb/ecm. Correct?

Then you had a separate issue with the actual tac->pedal harness, as well.

Always frustrating to have overlapping problems.

06-04-2016, 01:37 AM	#1
Bulldog88 Registered User Join Date: Nov 2009 Location: DFW,TX Posts: 233	I have no throttle responce dbw I have a dbw that's not working, truck starts and idles fine but i have no throttle,I have checked wiring and made sure pins are in the right spots, changed pedal, tac (pedal box) even throttle body and it won't work, ecm and engine came from 2004 truck. Any ideas?

06-04-2016, 09:29 AM	#2
clemsonteg Registered User Join Date: Jul 2012 Location: Anderson,SC Posts: 953	Re: I have no throttle responce dbw Did you modify the harness or did you put a swap specific harness?

06-04-2016, 01:14 PM	#3
Bulldog88 Registered User Join Date: Nov 2009 Location: DFW,TX Posts: 233	Re: I have no throttle responce dbw Speartech did the harness and ecm programming

06-04-2016, 01:36 PM	#4
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: I have no throttle responce dbw Before I blame the tuner (which I will, just not yet). Scan for codes; are you throwing any P or U codes? Check the purple and yellow wires off the throttle body, and make sure they haven't pulled out of the connector or broken. Reset the battery, try again. Do you get throttle response even a single time? Because you said you've replaced parts; where did they come from? Having as closely matched set of TB, Pedal, TAC, ECM, is ideal. If you start throwing parts at it, you can actually ADD problems instead of taking them away. What year did the pedal and tac come from? __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

06-04-2016, 03:04 PM	#5
Bulldog88 Registered User Join Date: Nov 2009 Location: DFW,TX Posts: 233	Re: I have no throttle responce dbw The tac and pedal that I put on it came from a 2001 suburban that my brother let me use, I haven't scanned for codes yet

06-04-2016, 04:04 PM	#6
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: I have no throttle responce dbw 2001 did not have dbw , so it could not have been from a 2001 suburban __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

06-04-2016, 04:53 PM	#7
Bulldog88 Registered User Join Date: Nov 2009 Location: DFW,TX Posts: 233	Re: I have no throttle responce dbw Yes it does I'm sitting here looking at the truck 2001 suburban

06-04-2016, 10:48 PM	#10
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: I have no throttle responce dbw I guesz im wrong but ive never seen on i service alot of these at work and pre03 all i have ever seen are dbc __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

06-04-2016, 11:09 PM	#11
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Re: I have no throttle responce dbw David... from what i have seen the trucks and suvs with traction control got dbw there definitely were not many that came dbw. Hope that might explain why you havent seen any. . __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

06-05-2016, 10:15 PM	#12
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: I have no throttle responce dbw That would make sense __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

06-06-2016, 07:49 PM	#13
Bulldog88 Registered User Join Date: Nov 2009 Location: DFW,TX Posts: 233	Re: I have no throttle responce dbw Fixed the issue guys, tac module was wrong, I had to go another one so I picked up a 04 model, also there was a faulty wire from the tac to pedal, did some soldering and now it runs like a champ

06-06-2016, 08:05 PM	#14
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: I have no throttle responce dbw Glad you found it. So just so we're clear for guys reading this; the 2001 TAC you borrowed (however unusual) did NOT properly interchange with your 2004 pedal/tb/ecm. Correct? Then you had a separate issue with the actual tac->pedal harness, as well. Always frustrating to have overlapping problems. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

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