Speed sensor connections
Discussion
Ok, I am trying to identify the wires that go into the speedo transducer box behind the dash.
The +Ve and earth were easy to find. Since my speedo box delivers a 60km/h signal when the car is at rest, this one was easy to find as well.
This leaves me with two unidentified wires: the one from the speed sensor and the one going to the speedo.
Unfortunately, when the rear wheels are moving, no tension can be measured at the connector of the speedo box ( and the speedo needle rests at 0). Does that mean my speed sensor is broken as well? Or does it mean the defective transducer box will affect the signal from the sensor?
The sensor has two wires, where do they come from and where do they go? Both through the transducer box or only the signal one goes there?
How to diagnose a faulty sensor without an oscilloscope?
Lots of questions I know....
Thanks for the hand.
The +Ve and earth were easy to find. Since my speedo box delivers a 60km/h signal when the car is at rest, this one was easy to find as well.
This leaves me with two unidentified wires: the one from the speed sensor and the one going to the speedo.
Unfortunately, when the rear wheels are moving, no tension can be measured at the connector of the speedo box ( and the speedo needle rests at 0). Does that mean my speed sensor is broken as well? Or does it mean the defective transducer box will affect the signal from the sensor?
The sensor has two wires, where do they come from and where do they go? Both through the transducer box or only the signal one goes there?
How to diagnose a faulty sensor without an oscilloscope?
Lots of questions I know....
Thanks for the hand.
Ok, so if the speedo signal goes to the speedo directly, either my speedo or the sensor is broken if the needle doesn't move from 0.
And the box is f
ked-up as well.... Nice.
So, I'll do the continuity check on the sensor, which will help me identifying the sensor wire that goes into the box and replace the broken component.
And the box is f
ked-up as well.... Nice.So, I'll do the continuity check on the sensor, which will help me identifying the sensor wire that goes into the box and replace the broken component.
Ok, did remove the center part in the cockpit and found the sensor wires.
The grey goes to the conditioner box and outputs as a blue that goes to the speedo.
But I am also open circuit on the sensor.... which means it is f*****!
Let's go and buy some new one.
The grey goes to the conditioner box and outputs as a blue that goes to the speedo.
But I am also open circuit on the sensor.... which means it is f*****!
Let's go and buy some new one.
Edited by e635815 on Thursday 20th July 08:19
The old sensor was open circuit and the seal at the wire end of the sensor was broken, thus allowing water to enter.
New sensor has a nice 457 Ohm resistance.
I re-assembled it and went for a drive.
It looks like this has also cured my idling speed holdup around 2000rpm.
The only thing left to sort is the needle reactivity: it only starts moving around 50/60 km/h.
Seems like the gap is too big.
New sensor has a nice 457 Ohm resistance.
I re-assembled it and went for a drive.
It looks like this has also cured my idling speed holdup around 2000rpm.
The only thing left to sort is the needle reactivity: it only starts moving around 50/60 km/h.
Seems like the gap is too big.
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