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Question

vauxhall astra, P reg, 1.7 td, electronic speedometer stopped working along with mileometer, changed sender unit at gearbox but still nothing, is there a relay that could be at fault if so where could it be and how do i identify it

Submitted: 334 days and 17 hours ago.
Category: UK Car
Value: $15
Status: CLOSED
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Optional Information

1995 Vauxhall astra merit van 1.7td

Already Tried:
changed sender unit, checked for blown fuse

Accepted Answer

hi there, there is no relay for this system. there are 3 wires at the sensor. the black wire is the 12v supply, the brown wire is the earth and the blue/red wire is the signal wire to the speedo. if you remove the sensor from the gearbox you can turn it by hand and at the same time check for a signal voltage being generated by the sensor. you should also check the drive pinion in the gearbox incase it is damaged, loose, broken etc as this too could cause your fault. if all checks out ok then you need to remove the instument cluster to check the signal voltage at the blue/red wire in the multiplug. if this is ok then the fault is either with the instrument circuit board or the speedo itself. if there is no signal at the blue/red wire then it needs to be traced back through the harness to find the break. hope this helps. cheers. davie.

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Expert: Davie
Pos. Feedback: 100.0 %
Accepts: 281
Answered: 12/8/2008

UK Car Mechanic

City & Guilds. Factory Courses

334 days and 15 hours ago.

Reply

thanks davie, the sender unit is a plunger type with just 2 wires in the connector both unfortunatly are black, i have removed the sender unit connected it to a meter and tested its resistance by pressing the plunger in, that seemed ok

Accepted Answer

hi paul, from your description i think you are at the reversing light switch not the speedo sensor. i am a vauxhall master technician and there isn't a speedo sensor like you describe. cheers. davie

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Expert: Davie
Pos. Feedback: 100.0 %
Accepts: 281
Answered: 12/8/2008

UK Car Mechanic

City & Guilds. Factory Courses

334 days and 11 hours ago.

Reply

thanks davie oopps,,,,,,, where on the gearbox is the speedo located !

Posted by Davie 334 days and 10 hours ago.

Answer

hi there, if you are at the reverse switch, then the speedo sensor is about 10" towards the rear near the driveshaft area. cheers. dave

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