Question about Cars & Trucks
What make , model and year vehicle ? Don't know how much you know about the modern automobile , how computes and how data transfer happens ! Speedometer , tachometer , fuel gauge , tempreature gauge etc.... Sensor inputs from these sensors are iinputs to the PCM - engine computer and to get to the gauge in the instrument cluster , this info is sent by a message on the serial data bus . The VSS - vehicle speed sensor not only supply's info the speedometer but also the PCM use's for transmission shift points .
How often does this happen (RPM and speedometer drop out ?) Could have lose connector in the wiring harness or at the PCM . A wire that is grounding on on the frame or body .The first place to start would be checking for DTC'S diagnostic trouble code's . Could make diagnostic's a whole lot easier !
Posted on Dec 10, 2016
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Posted on Jan 02, 2017
SOURCE: my husband needs to locate
The VSS is located on the tail section of the transmission on 2WD models. On 4WD/AWD models, it is located on the transfer case.
Posted on Aug 04, 2011
Testimonial: "thx that pic was very helpful...much appreciated.."
Have you checked the fuses? Without knowing all the details I would guess fuse or ground out somewhere along the line. Also chk to see if the needle is stuck under the pin. Although unlikely it does happen. I hope that helps you to solve your problem.
Posted on Nov 11, 2011
SOURCE: Gauges Rpm & speedometer
No the problem is the cluster computer is defective, remove it from the truck and have it rebuilt by a local GM cluster repair shop, turn around is about 1 week so plan on not having use of the vehicle.
Posted on Jul 13, 2012
we presume car runs ok, and CEL is not glowing runinng. right>?
the tranny speed sensor does not run the tachometer, at all. sORRY!
if both gauges die, then that means (both fuses good)
the cluster is bad.? (do the self test i posted yesterday?)
or you scan it and see the PCM can not communicate (PCI) to the cluster brain?> bingo?
here is the list.
barrow, rent, buy, or ask any shop to scan it.
here ill condense that for you.
again, posted here 100s of time, this magical test.
2004 WJ jeep FSM (condensed)
jeep calls this the EMIC (cluster)
chapter 8J quotes:
The EMIC also has a self-diagnostic actuator test
4000 page manual and above repeats 100 of times.
8J-page 8 bingo
if that passes , then id bet the pcm has comm errors to EMIC.
if the rpm was 0. the engine cant run, the engine PCM
has 2 sensors for RPM, cam and crank, id bet for sure
neither are dead., or engine dies.
scan it and win.... I promise. (after fuse and self test)
Posted on Aug 19, 2015
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