Speed Sensor Problems

helly4046 · 10-22-2009, 08:14 PM

About a month ago my speed sensor went out and I installed a new one problem fixed. One a hunting trip a week ago my tach started dropping to zero but still worked, on the way home yesterday it worked when I started it up, and then once it was warm it didnt work at all. Drove home with drained batteries, luckily I have a manual fuel shutoff cable. I have checked the gap on the sensor and cleaned the harmonic balancer, checked all wires and the plug all the way up to the wiring harness.

My question is what could cause the sensor to fail, PCU?

Any Ideas would be greatly appreciated, I dont mind driving it without a tach but it doesnt allow the alternator to function without the tach reading.

__________________
98-12v, 5sp ext cab long bed. 315 Toyo mt's S&B air, 4" straight pipe, fuel plate, some sh!#$y clutch a guy talked me into.

heffenauger · 11-07-2009, 11:34 AM

Helly,

Can you post the resolution to your problem? I am having the same issue and could use your insight.

__________________
[b]Red 2006 3500 Cummins Mega Cab Laramie 4x4, 2" leveler, 35" Toyo's, K$N, Muffler removed, Superchip, Tri-gauge piller mount, 5th wheel slider hitch. - .......AKA "the big red school bus"

97whitecummins · 11-13-2009, 12:39 AM

when my alternator went my batteries got so low my tach went first, then speedo, then the rest of the guages. is you alternator charging

__________________
97 white 2500 5 speed 4x4, BHAF, 4in. straight pipe, 16* timing, no plate, gutted afc, 5" black aussies, ranch hand front bumper

helly4046 · 11-13-2009, 03:39 PM

I ended up returning the sensor to NAPA and with some help from a mechanic they warrantied it. So far it has been working, I need to hook up a computer to it and see if the pcm is throwing any codes. Is would be cool if there was a way to bypass the pcm, so that if the engine is running the alternator would charge regardless of what the pcm is doing....

__________________
98-12v, 5sp ext cab long bed. 315 Toyo mt's S&B air, 4" straight pipe, fuel plate, some sh!#$y clutch a guy talked me into.

10-22-2009, 08:14 PM	#1 (permalink)
helly4046 Newbie Join Date: Dec 2006 Location: Idaho Posts: 25 Thanks: 0 Thanked 0 Times in 0 Posts helly4046's Truck Pics	Speed Sensor Problems About a month ago my speed sensor went out and I installed a new one problem fixed. One a hunting trip a week ago my tach started dropping to zero but still worked, on the way home yesterday it worked when I started it up, and then once it was warm it didnt work at all. Drove home with drained batteries, luckily I have a manual fuel shutoff cable. I have checked the gap on the sensor and cleaned the harmonic balancer, checked all wires and the plug all the way up to the wiring harness. My question is what could cause the sensor to fail, PCU? Any Ideas would be greatly appreciated, I dont mind driving it without a tach but it doesnt allow the alternator to function without the tach reading. __________________ 98-12v, 5sp ext cab long bed. 315 Toyo mt's S&B air, 4" straight pipe, fuel plate, some sh!#$y clutch a guy talked me into.

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11-07-2009, 11:34 AM	#2 (permalink)
heffenauger Newbie Join Date: Jan 2008 Location: Washington State Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts heffenauger's Truck Pics	Helly, Can you post the resolution to your problem? I am having the same issue and could use your insight. __________________ [b]Red 2006 3500 Cummins Mega Cab Laramie 4x4, 2" leveler, 35" Toyo's, K$N, Muffler removed, Superchip, Tri-gauge piller mount, 5th wheel slider hitch. - .......AKA "the big red school bus"

11-13-2009, 12:39 AM	#3 (permalink)
97whitecummins Cummins Fan Join Date: Feb 2009 Location: bethel, pa Posts: 88 Thanks: 0 Thanked 0 Times in 0 Posts 97whitecummins's Truck Pics	when my alternator went my batteries got so low my tach went first, then speedo, then the rest of the guages. is you alternator charging __________________ 97 white 2500 5 speed 4x4, BHAF, 4in. straight pipe, 16* timing, no plate, gutted afc, 5" black aussies, ranch hand front bumper

11-13-2009, 03:39 PM	#4 (permalink)
helly4046 Newbie Join Date: Dec 2006 Location: Idaho Posts: 25 Thanks: 0 Thanked 0 Times in 0 Posts helly4046's Truck Pics	I ended up returning the sensor to NAPA and with some help from a mechanic they warrantied it. So far it has been working, I need to hook up a computer to it and see if the pcm is throwing any codes. Is would be cool if there was a way to bypass the pcm, so that if the engine is running the alternator would charge regardless of what the pcm is doing.... __________________ 98-12v, 5sp ext cab long bed. 315 Toyo mt's S&B air, 4" straight pipe, fuel plate, some sh!#$y clutch a guy talked me into.