Q's 1987 VL Calais Walkinshaw project

[Drizt]

Beautiful mate. Fantastic colour.

Sent from my Nexus 5 using Tapatalk

 

[GRPAVL]

thanks guys - I love how it can go from a deep burgandy to a vibrant red depending on the light - Guys thats the Xirilic paint job for you.

 

[ievaq8]

im really digging the wheels...
look so much like fr's but different...

loving the car altogether...well done

 

[GRPAVL]

Notes to self re the VSS error (error code #24)

The VSS (vehicle speedo sensor) has three wires
1) 12v ignition (pink or pink/blue)
2) Earth (black/white)
3) Speedo trip Computer (violet/white)

The Speedo trip computer (VN Dash) has 4 wires
1) 12v ignition (pink or pink/blue)
2) Earth (black/white)
3) VSS (violet/white)
4) Output to the ECU pin A10 (brown/yellow)

I guess I just need to trigger the A10 wire to do something therefor giving it a signal that the vehicle is in motion (what the speed sensor would do via the dash) normally - research time.

Q

 

[GRPAVL]

After Belagio Cafe this mornign I whipped the old VN dash apart.

On the back of the speedo drive unit it says 859 and 3.9.

I take that to mean that the speedo trip computer is expecting 859 pulses per Km from the VSS with a 3.9:1 ratio diff.

next ....

 

[GRPAVL]

ignore the above. I have no idea about the 859 stamp on the back. Bit of google searching and I have found that ....

VSS (vehicle speed sensor) - is a three wire hall effect sensor, 10 pulse per revolution

VN/VP - VSS pulses to Dash, Dash drops to 2 pulses per revolution and feeds to the A10 pin on ECU (1250 r/km)
VR/VS - Dash does no conversion. ECU accepts 10 pulses per revolution

the VSS is used for -
Fuel Maps
Speedo Drive (unless you run manual cable like I am)
IAC (Idle Air Control)
Cruise Control (plan to use the VL setup anyways)
TCC (Torque Convertor Clutch Solenoid)

Not running a VSS causes multiple issues -
Stalling at idle is common (mainly on box swaps though),
rough idle (i had this before running 95 RON),
poor fuel economy (I guess cause you cant use maps properly)

I talked to Robinson Instruments and they have an inline VSS ($120+) that I could use except it has a keyway connection not the square connection like Holdens use. It does 8 pulses per revolution so would need converter box ($60+) to feed 2 pulses straight to ecu. Only other thing is I would need to recore my cable to be a keyway drive as opposed to square drive ($60+) .... grrrr

I did find a post that said you could reprogram the Delco ECU so it is looking for X pulses. If this is the case then I wont need the converter and I am sure I can find a square drive inline VSS on ebay if I look.

time for some more research.

Q

 

[corhijasna]

good luck with all the above matey,lol

 

[Immortality]

Hey Mate,

Looks like you have been busy.

Do a search for T700 speed sensors, you may find one that has both a cable output as well as an electrical one (I have seen them for the T5 manual boxes).

Worst case scenario I can change the speed sensor pulses in the tune.

 

[GRPAVL]

thanks immortality. will be in touch

 

[GRPAVL]

God I love Holdens ..... My VSS issues are fixed (or will be shortly) and it cost me nothing, zip , zero , nadda

This is the back of the Factory VL Calais Holden Dash



Notice the size of the block on the back of the speedo head. underneath is an optical sensor pickup for the cruise control system and feeding to the factory ECU .......

Notice pins 6/7/8 = o/put 2 pulse

hmmmm this sounds very familiar. lets check my vl wiring diagrams, hmmm. pin 7 goes to cruise control module.

I have 2 spare 2 pulse output pins. I woner where I should feed one of them ....

hmmm pin 8 wire colour is brown/yellow trace, this is the same as pin a10 on the VN ECU .....

OMG .... problem fixed

Im so smart and happy and have saved myself $200 (not that i will tell the wife of course)