Neither of those are for the traction control, and neither are the dash input.
The sensor at the front of the gearbox is the oilpump speed, and the sensor at the rear of the box (passengers side) is the ecu speed input.
The traction control will work off the ABS sensors.
Now, I can only deal with my UZZ30 knowledge, which I would assume is identical to the JZZ30.
The speedo drive is at the rear of the box, but on the drivers side.
I highly doubt this is out unless someone has played with the diff ratio or the speedo gear.
Jaycar do a correction unit if you know how much out it is.
Has he run diagnostics? The OD light will flash telling you what is at fault.
If he thinks its the rear gbox ecu input, then swap it with the one on the front of the box (they are the same), reset the ecu, go for a drive until the OD light comes on, and then check the diagnostics.
If it still says its the rear sensor, then its most likely the wiring. Check continuity back to the ecu. One of my solenoid power wires was somehow damaged somewhere in the loom at one stage, and was throwing a solenoid error. Gave it 12v, and the error went away.
If its now the front sensor, then its most likely the sensor.
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