VZ Ute speedo not working

[Madmatt2006 Profile]

Hi Guy's

back again with a different problem, I finally got the ute to a point that it's now all working except the speedo! neither the dial or digital,I have checked a few things.

1. I did the dash test on the car by holding the mode/set buttons and did the cluster check, the speedo popped up to 100 so it seems to be ok.
2. I tested the voltage to the speed sensor in the 6 speed manual it has 12V to pin 1. and pin 2. negative

the speed sensor part number is GM09114603 it has 3 pins, from testing the plug it seems that pin 1. is 12v+ pin 2. in the negative pin 3. is pulse. is that correct?

I tried testing the sensor by hooking 12v to pin 1. and negative to pin 2. the I hooked multi-meter to pin 3. and pin 1. set to dc volts and passed metal by the sensor. no voltage change on multi-meter

1. So I was wondering if I had the pinout right for that sensor?
2. also is that the only sensor the speedo talks to for speed?
3. anything else to check?

Thanks Guy's

[Madmatt2006 Profile]

Hi Guy's

I changed the speed sensor in the manual gearbox and the speedo is still not working. Do the wheel speed sensors effect the speedo? could this be why it's not working? Not sure what to check next..

[delcowizzid]

I thought t56 was 2 wire reluctor sensor not 3 wire hall effect.where did you wire the speed sensor into on the ecu

[Madmatt2006 Profile]

Hi delcowizzid,

The car has standard wiring, the gearbox wiring connects to the engine wiring loom at the back of the engine. I changed the speed sensor in the gearbox to see if the speedo would start working it's a 3 wire sensor for sure same as the original one 3 wire hall effect.

I guess next step is the test speedo pulse wire b33 and power to the sensor.

is there any other sensors the speedo uses?

[Dylan Profile]

I've never come across a T56 with a 3 wire speed sensor

[vs ss Profile]

I take it this must be a Vz v6 Aisin gearbox if it has a hall sensor?
I’m not saying it’s your problem, but I have replaced a few ecu’s cause of this problem.

[Madmatt2006 Profile]

the VZ ute is a SVZ maybe why box is different?? I have a spare ecu and BCM I will swap them on the weekend to see if it works.

[Madmatt2006 Profile]

Hi Guy's

Sorry to take so long to post back. I tried spare ecu and BCM still the same. So I took a closer look at the wiring loom at the back of the motor, I noticed the part of the engine loom that connects to the gearbox loom has 4 wires in it, and the gear box loom that connects to the engine loom has 3 wires! (both 4 pin connectors)

this car has a history it did not run when I got it see here viewtopic.php?f=37&t=6015

I wonder if the gearbox loom is the wrong one ( possible swapped) would anyone please have the pin outs so I can check what the missing wire is for?

P.S reverse lights are working....

Thanks Guys