Install a speedo corrector kit VN/VP

[lowvpcal]

hey bart yea that doesnt make much sense to me im not the best with diagrams

 

[Cheap6]

ok is that a blue with white trace or vice versa? and which colours come from the trans to this area? i know theres 3 from the speed sensor: Theres a Black with white stripe
Purple with white stripe and a Pink with blue stripe. where do these go on the vr loom/vp ecu so i can have a speedo again?

You are going to have to figure it out yourself some.

You will need to connect ignition switched battery voltage to the P/Blu. Doesn't matter too much where that comes from but it should be fused. I think that it's 15A.

B/W is the earth for the sensor (needs to be connected to an earth).

V/W is the signal wire for the 4L60 Hall sensor. This will have to have regulated 10 volts to it from the speedo head and will be switched to the sensor earth by the sensor as it rotates.

On a VP, the signal wire goes to the lower leftmost terminal of the middle/right plug that the instrument cluster fits over/onto. You may have to run that wire outside of the VR harness to get to that terminal. If the clusters are the same in VR and VP, that should get you a working speedometer. If that terminal spot is filled, you can trace the wire back through the harness to find a convenient connection point. That wire is also spliced to provide signal wires to the trip computer and BCM, again on VP.

In a VP, the speed signal (from the speedo) to the ECM is a brown yellow wire, top row, 4th from the left in the rightmost connector behind the cluster. That goes to terminal A10 at the ECM. In a VP that will be a processed signal with the speed sensor signal frequency being divided by five. You may have to run another wire for that also as that won't be present in a VR harness.

As you have already been told in an earlier post, the speed signal in a VR comes from the PCM to the speedo head - actually the voltage at the speedo head is earthed through the PCM in an analogous way to the Hall sensor earthing the signal in the VP. If that signal has a different frequency between VR and VP you will have to use something like the digital speedometer adjuster to alter the frequency back. Have a look at the clusters - PCB's, terminal connections - for both the VR and the VP to see if they are the same. Even if the clusters are different, the speedo heads may be interchangeable.

 

[lowvpcal]

ok that make a lil sense i spose itll be trial and error ey haha thanks heaps for that. thats basically exactly what i wanted ill let you know how i go cheers again
dave

 

[Cheap6]

It's not quite trial and error but you will have to think about it a bit and figure it out.

Having given it a little more though myself, I think that if you find the connection for the VR harness where it plugs into the PCM, (it should be under the glovebox) that will be the easiest place to connect to the Hall sensor signal wire. That way the spliced connections for the trip computer and BCM will be included.

I think it makes sense that VR will be the same as VP except with the PCM subsituting its derived signal for the signal for the Hall sensor in the VP, with the divided by five signal deleted. I don't have easy access to a VR wiring diagram to check though.

Incidentally, which BCM are you using; VR or VP?

 

[lowvpcal]

im using a complete 93 vr calais loom with bcm's and everything else that was on the loom. all i really know for certain about the speedo wires is the vp goes straight to the speedo and then to the ecu where as vr runs through the ecu then to the speedo but im running the vp computer with a vr loom and cluster. im definitely keen to have a crack at it today as its my one day off a week . so ill study what youve typed above a bit more in an attempt to translate it into laymens terms and go from the there i think cheers dave

 

[88GreenVN]

I've just fitted a speedo corrector to my VN - all going OK until I try and set the speedo.

The moment I change the S1 or S2 the speedo drops dead... What have I missed??

 

[Immortality]

Have you fitted LK2 and LK3 on the PCB board?

 

[88GreenVN]

Have you fitted LK2 and LK3 on the PCB board?

I had LK2 for the test (flashing red LED) and then LK4 to get the speedo working.

 

[Immortality]

weird, i'm sure i had LK2 for the test to get the LED flashing, then turn S1 and S2 each to 0 and then fitted LK3 and then you adjust S1 and S2 to correct the speedo

 

[88GreenVN]

weird, i'm sure i had LK2 for the test to get the LED flashing, then turn S1 and S2 each to 0 and then fitted LK3 and then you adjust S1 and S2 to correct the speedo

I'll give it a go tomorrow - I've built a second kit to test also.

Do you remove LK2 after the test or leave it on?