Do our Dodge Ram SRT/10'S have electronic tachometers and speedometers/signals? :dontknow:
Thanks,
Carl
Thanks,
Carl
Simple Electronic Question
- Thread starter Carlwalski
- Start date
Floor
Full Access Member
lemme check
Thanks mate. 
Mine is at the shop but I wouldn't know how to check even if it were up the drive lol.
Is it something that would be in the truck manual or is it too technical for that?
Cheers,
Carl
Mine is at the shop but I wouldn't know how to check even if it were up the drive lol.Is it something that would be in the truck manual or is it too technical for that?
Cheers,
Carl
Floor
Full Access Member
The speedometer gives an indication to the vehicle operator of the relative vehicle road speed. This gauge is controlled
by the instrument cluster circuit board based upon cluster programming and electronic messages received by
the cluster from the Powertrain Control Module (PCM) over the Programmable Communications Interface (PCI) data
bus.
The speedometer is an air core magnetic unit that receives battery current on the instrument cluster electronic circuit
board through the fused ignition switch output (run-start) circuit whenever the ignition switch is in the On or Start
positions. The cluster is programmed to move the gauge needle back to the low end of the scale after the ignition
switch is turned to the Off position. The instrument cluster circuitry controls the gauge needle position and provides
the following features:
² Vehicle Speed Message - Each time the cluster receives a vehicle speed message from the PCM it will calculate
the correct vehicle speed reading and position the gauge needle at that relative speed position on the
gauge scale. The cluster will receive a new vehicle speed message and reposition the gauge pointer accordingly
about every 88 milliseconds. The gauge needle will continually be positioned at the relative vehicle speed
position on the gauge scale until the vehicle stops moving, or until the ignition switch is turned to the Off
position, whichever occurs first.
² Communication Error - If the cluster fails to receive a speedometer message, it will hold the gauge needle at
the last indication for about ten seconds, or until the ignition switch is turned to the Off position, whichever
occurs first. After ten seconds, the gauge needle will return to the left end of the gauge scale.
² Actuator Test - Each time the cluster is put through the actuator test, the speedometer needle will be swept
to several calibration points on the gauge scale in a prescribed sequence in order to confirm the functionality
of the gauge and the cluster control circuitry.
The PCM continually monitors the vehicle speed sensor or the Controller Anti-lock Brake (CAB) to determine the
vehicle road speed. The PCM then sends the proper vehicle speed messages to the instrument cluster. For further
diagnosis of the speedometer or the instrument cluster circuitry that controls the gauge, (Refer to 8 - ELECTRICAL/
INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING).
For proper diagnosis of the vehicle speed sensor, the CAB, the PCM, the PCI data bus, or the electronic message
inputs to the instrument cluster that control the speedometer, a diagnostic scan tool is required. Refer to the appropriate
diagnostic information.
by the instrument cluster circuit board based upon cluster programming and electronic messages received by
the cluster from the Powertrain Control Module (PCM) over the Programmable Communications Interface (PCI) data
bus.
The speedometer is an air core magnetic unit that receives battery current on the instrument cluster electronic circuit
board through the fused ignition switch output (run-start) circuit whenever the ignition switch is in the On or Start
positions. The cluster is programmed to move the gauge needle back to the low end of the scale after the ignition
switch is turned to the Off position. The instrument cluster circuitry controls the gauge needle position and provides
the following features:
² Vehicle Speed Message - Each time the cluster receives a vehicle speed message from the PCM it will calculate
the correct vehicle speed reading and position the gauge needle at that relative speed position on the
gauge scale. The cluster will receive a new vehicle speed message and reposition the gauge pointer accordingly
about every 88 milliseconds. The gauge needle will continually be positioned at the relative vehicle speed
position on the gauge scale until the vehicle stops moving, or until the ignition switch is turned to the Off
position, whichever occurs first.
² Communication Error - If the cluster fails to receive a speedometer message, it will hold the gauge needle at
the last indication for about ten seconds, or until the ignition switch is turned to the Off position, whichever
occurs first. After ten seconds, the gauge needle will return to the left end of the gauge scale.
² Actuator Test - Each time the cluster is put through the actuator test, the speedometer needle will be swept
to several calibration points on the gauge scale in a prescribed sequence in order to confirm the functionality
of the gauge and the cluster control circuitry.
The PCM continually monitors the vehicle speed sensor or the Controller Anti-lock Brake (CAB) to determine the
vehicle road speed. The PCM then sends the proper vehicle speed messages to the instrument cluster. For further
diagnosis of the speedometer or the instrument cluster circuitry that controls the gauge, (Refer to 8 - ELECTRICAL/
INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING).
For proper diagnosis of the vehicle speed sensor, the CAB, the PCM, the PCI data bus, or the electronic message
inputs to the instrument cluster that control the speedometer, a diagnostic scan tool is required. Refer to the appropriate
diagnostic information.
Floor
Full Access Member
so controlled by PCM via PCI data bus... looking for anything in particular?:dontknow:
Thanks Floor, the info given is great but above my head. In Layman's terms? :laugh: I am/was contemplating getting a Engear electronic gear indicator. Necessary? Hell no. Cool factor? Hell yes! They are made for motorcycles but are universal and will work on anything that has "ELECTRONIC TACHO AND SPEED SIGNALS." What do you wreckon? Will it work? I'd mount it flush on the dash or somewhere like that.
http://www.yoyodyneti.com/ProductInfo.aspx?productID=CIENG
http://www.yoyodyneti.com/ProductInfo.aspx?productID=CIENG
Last edited:
Instructions/Manual: http://www.starlane.com/manuali/Engear_Ing_Conn.pdf
Floor
Full Access Member
it should be possible... let me dig into the schematics...
BTW :looks cool to have.:rock:
BTW :looks cool to have.:rock:
Thanks mate, I've got a couple of cool mounting positions/gadgets I will share when the truck is done.
Cheap to buy, might see more of them in our vehicles in future, who knows.
Cheers brother, you know your electronics, you in the field of that stuff or just too much spare time?
Cheap to buy, might see more of them in our vehicles in future, who knows.
Cheers brother, you know your electronics, you in the field of that stuff or just too much spare time?
Floor
Full Access Member
I'm an engineer in electro-mechanics, kinda rusty in this right now as my main job is at a marketing department but i'm still interested in those things.
And I have a 3 weeks holiday right now so lots of time
And I have a 3 weeks holiday right now so lots of time
Cool! So what say thee? Can it be done? There are several brands and most of these say for motorcycles or vehicles with electronic tacho and speedometers or signals.
Floor
Full Access Member
patience my dear kiwi , i'll be back
, i'll be back
Sweet! :rock:
For some reason I think it can be done but there will be a catch.........
:rock: For some reason I think it can be done but there will be a catch.........
Floor
Full Access Member
details about the PCM can be found here :
http://www.vtcoa.com/forums/showthread.php?t=6539&highlight=speed+sensor
Speed and RPM (pulse signals) can be taken from the PCM, but I don't have the 2006 service manual with me, perhaps other can chime in with the right pin No's or wire color code to tap from.
http://www.vtcoa.com/forums/showthread.php?t=6539&highlight=speed+sensor
Speed and RPM (pulse signals) can be taken from the PCM, but I don't have the 2006 service manual with me, perhaps other can chime in with the right pin No's or wire color code to tap from.
Thank you Floor, I really appreciate the help mate. So, from what you just posted about the PCM, in layman's terms, can it be done? If it can be done I will purchase and worry about which wires to tap from later LOL well, I won't, my shop will. They don't know anything about it lol They will tomorrow (Monday morning). :laugh: They won't mind though, good friends.
Cheers!!
Cheers!!
Floor
Full Access Member
bottom line, it can be done:rock:
Sweet!! If not it's not a major loss. At around $100-$120 USD for these units it's not going to break the bank.
Well worth trying IMO. Now, time to start looking for a mounting location just in case it can be done.
Cheers Floor.
Well worth trying IMO. Now, time to start looking for a mounting location just in case it can be done.
Cheers Floor.
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