522714-4 Mechanical Accelerator Position Sensor OORL.
190-4 is loss of crank pulse. Cam pulse without crank pulse.
The problem that I have is that it runs poorly but only intermittently, sometimes it runs fine. It's not misfiring. I rebuilt the Fuel Reg. and replaced the lp filter since the truck has 11,000 + hrs. Tuned up as well. Getting spark at each plug. No check engine light, but this first code I see from it's history is 190-4. I don't have the service password to erase them and I'm not getting a code at all. I believe the throttle body is getting stuck, I hear it click every time it's running poorly....
You have a short between the 12 volt supply and the signal on the horn. It happens all the time on these trucks. The horn is under the step on the right hand side.
Did you ever find a solution to the problem. I am having the same problem with a Yale GLC60 with a Mazda. Runs fine and then poor intermittently. Got a 190-4 as well....
Thanks for the input. To follow up, horn blows constantly, no open here. However, their are modules/components in foot well housing?
I think you will find the horn has gone open circuit, it's been awhile but I think you will find it in the right hand foot well housing
I also have a code 524213-3, unit left in rain. Where is horn output driver? I am working on a GLC03VXN
thanks to all of you, I'll check these out today. Have a great week end.
swoop is right, also, in my experience, these codes are what sometimes get set when you have a loose alternator belt or intermittent wire connection at the alternator. (like a loose large wire that is connected by a nut, when the nut is only finger tight), or when someone tries to jump another truck with the jumper cable wrong,
Is this truck an "LPS" rated truck? if so, you may have a problem with the connection internal to the 'LPS' shut off switch that is a cable pulled switch or just someone that pulls the cable to see what it does.
hth
well that may be what it is, a bad battery
but there are other causes for the DTC 168-4 also
alternator failure
operation cycle too short to charge battery
Quiescent current draw too high during truck off time
As for the other codes
DTC 190-4 not in the DTC code chart
DTC 524213-3 Horn Alarm Output Driver OORH
cause
Horn output driver short to battery
DTC 524263-1 Uncommanded Power Down
cause
VSM Failure
Now of course a defective battery may trigger many codes due to the erratic voltage it may be supplying but i would certainly not ignore these other codes if the battery is found to actually be the problem and replaced.
I would try and charge the battery, check it, load test it
if pass...then reinstall it and clear codes and run truck to see if any codes return.
if battery fails then replace battery, clear codes, run truck and monitor it.