Hi all,
1st post, I'll add an intro elsewhere shortly. Not an 80 owner myself but my Dad is and Ive been helping him maintain his UK 12v J80 4.2 for 10+ years.
The speedo and odo recently stopped working and I cant get to the bottom of it. Ive searched a fair bit on here but could not find anything specific to this issue. The failure was not immediate. The speedo initially failed when the car was cold, then would spring into life within 1/2 mile. That lasted 1-2 weeks then it just gave up and stopped. We sourced a replacement gauge cluster from Garry Rigby and fitted that. This resolved it for about 500 miles then the same thing happened. The VSS was the next obvious culprit. This was removed and bench tested according to the extract of the Toyota manual I found in another thread on here, it worked fine (ie 4x pulses per rev). We also got a new replacement to fit, again no change, with either gauge cluster.
What am I missing? Ive had one gauge cluster completely in bits to look for burnt out components etc, all look good. On both clusters both the odometer and speedometer failed simultaneously, so it cant be one of the motors in the gauge itself.
The wiring under the car is fine, the cable to the VSS has not been damaged. Ive tested continuity of 2 pins to +12v and earth, the other is obviously the signal wire. I don't know where to chase that to. In the dash, there is no obvious damage to any of the wiring loom. There are no blown fuses either.
Im a bit stuck., any advice would be very welcome. Thanks.
PS as a seperate issue, there is a small oil leak coming from the transfer box where the VSS interface piece fits in (The part that has the take off shaft to drive the VSS itself). Can replacement seals be sourced for this?
1st post, I'll add an intro elsewhere shortly. Not an 80 owner myself but my Dad is and Ive been helping him maintain his UK 12v J80 4.2 for 10+ years.
The speedo and odo recently stopped working and I cant get to the bottom of it. Ive searched a fair bit on here but could not find anything specific to this issue. The failure was not immediate. The speedo initially failed when the car was cold, then would spring into life within 1/2 mile. That lasted 1-2 weeks then it just gave up and stopped. We sourced a replacement gauge cluster from Garry Rigby and fitted that. This resolved it for about 500 miles then the same thing happened. The VSS was the next obvious culprit. This was removed and bench tested according to the extract of the Toyota manual I found in another thread on here, it worked fine (ie 4x pulses per rev). We also got a new replacement to fit, again no change, with either gauge cluster.
What am I missing? Ive had one gauge cluster completely in bits to look for burnt out components etc, all look good. On both clusters both the odometer and speedometer failed simultaneously, so it cant be one of the motors in the gauge itself.
The wiring under the car is fine, the cable to the VSS has not been damaged. Ive tested continuity of 2 pins to +12v and earth, the other is obviously the signal wire. I don't know where to chase that to. In the dash, there is no obvious damage to any of the wiring loom. There are no blown fuses either.
Im a bit stuck., any advice would be very welcome. Thanks.
PS as a seperate issue, there is a small oil leak coming from the transfer box where the VSS interface piece fits in (The part that has the take off shaft to drive the VSS itself). Can replacement seals be sourced for this?
