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KnuckleBuster76
Active Member
45 Posts |
 Posted - 09/25/2017 : 10:05:06 AM
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2004 International IC, conventional cab, 444 engine, 2000 series Allison Transmission.
What's already been replaced:
Throttle Position Sensor
Throttle pedal assembly
Neutral Safety Switch Assembly
Codes:
135 Idle Validation Switch Circuit Fault
134 Accelerator Position and Idle Validation Disagree
133 Accelerator Position Signal InRange Fault *M*
Here's what happens: I cannot get it to act up for me, no matter how much I drive it. Without ANY warning, there is no throttle response. Shut it down, restart, and the problem goes away for 10 minutes to 6 days. In the process of checking connections and will shortly be tearing apart wire looms.
Ideas, questions, comments, concerns? Sick of these things making me look like an idiot. |
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td083
Senior Member
195 Posts |
Posted - 09/25/2017 : 10:54:16 AM
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| I would check what the voltage reading is on your bus and what it is on a known good one I know from my issues a small difference in the voltage seen by ecm will cause an issue , just stinks of course its always intermittent so may read the same ? Or even swap your pedal assy with a known good bus who knows throttle sensor may have not been set perfectly in spec |
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KnuckleBuster76
Active Member
45 Posts |
Posted - 09/25/2017 : 11:23:00 AM
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| Exactly... I have to wait until it acts up to be able to properly check it! But for me, it NEVER acts up. Literally never. I drove it for a week and it never missed a beat! |
"Just... I dunno... Just fix it." |
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KnuckleBuster76
Active Member
45 Posts |
Posted - 09/25/2017 : 12:20:29 PM
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| Swapped out the pedal assembly from a bus that works... no difference... yet. |
"Just... I dunno... Just fix it." |
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second.flood
Top Member
USA
640 Posts |
Posted - 09/25/2017 : 12:59:03 PM
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| Try the pigtail to the sensor. |
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krmvcs
Advanced Member
362 Posts |
Posted - 09/25/2017 : 1:43:30 PM
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| ive had these same issues on gillig transit buses with the dt466. the fix for that was running a new wire harness from the TPS to the ECM. |
-Ken- |
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eddo
Advanced Member
USA
311 Posts |
Posted - 09/25/2017 : 5:25:07 PM
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I had a '99 do this, and it ended up being the wiring at the neutral safety switch.
good luck |
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KnuckleBuster76
Active Member
45 Posts |
Posted - 09/26/2017 : 04:02:48 AM
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| Still plugging away, looking for junk wires. All connections seem to be okay, so it's a matter of splitting looms and checking those, looking for internal breakage. |
"Just... I dunno... Just fix it." |
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KnuckleBuster76
Active Member
45 Posts |
Posted - 09/26/2017 : 04:33:35 AM
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| Ugh! There have been so many electrical problems recently with the other location's buses that I forgot which bus I was looking at! I'm missing looking at obvious things because I thought I already looked at them, when it was another bus I drove over and looked at! Back to square one... Wish me luck! |
"Just... I dunno... Just fix it." |
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earl1412
Senior Member
101 Posts |
Posted - 09/26/2017 : 07:22:39 AM
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Is the driver of the bus of short stature? Does the persons heel touch the floor to keep the foot from bouncing erratically?
Just a thought. |
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td083
Senior Member
195 Posts |
Posted - 09/27/2017 : 02:32:27 AM
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| earl1412 brought up a good point there , seems there is an area at times where the idle validation may say its off idle , but to where throttle is not depressed enough , in which it could do this because its seeing the ids say one thing and the tps the opposite , not saying its likely but possible id imagine |
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Donguy
New Member
7 Posts |
Posted - 10/19/2017 : 04:22:10 AM
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| KnuckleBuster76, regarding the throttle problem. Just wondering if you found the problem. I have the exact same problem and have done everything you have with no results. Short of burning it up, I could use some help as well. |
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td083
Senior Member
195 Posts |
Posted - 10/19/2017 : 10:24:07 AM
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I don't know about your buses but on one recently noticed it had multiple issues with throttle response throughout months it kept returning had new pedal assy installed 2 times along with some connector replacements
--one thing I noticed and was curious if it could or not cause the issue is the tps sensor shares the same vref wire with the baro sensor and was speculating if possible the baro could be causing miss info or faulting causing the issue ...don't know something you may want to check haven't seen this one back yet and yes I could not get it to act up as well ...only the tps and baro had this vref wire in common none of the other sensors , I know ive seen say the map cause issues where the icp shows nothing and so on ... |
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Headscratcher again...
