fitted a knocklink (2nd hand, was working) to engine, on top of gearbox/engine casing join underneath intercooler.

wired it up.

lowest green light comes on. nothing else.

have tried the sensitivity all the way clockwise & anti-clockwise & have repeatedly tapped/knocked engine but nothing happens, just the green light at the bottom stays on.

any ideas?

 

The unit is sensitive to a particular frequency range, so whacking the block with a hammer for instance may not be the frequency it's looking for. Try tapping the block close to the sender with something lighter - small spanner, screwdriver etc. A good test is to see if you get one or both of the greens light up when you operate the starter motor.
JohnD

 

Tapping the block near by will have little effect i'm affraid.

As a quick function chk of KL monitor carry out the following,
Rotate the sensitivity dial completly clockwise and leave it there. No need to touch it any more. Insure lwr green power light is on, locate sensor. Using say a handle of a screw driver tap top of sensor. You'll actually be tapping the bolt head which is locating sensor to block. Don't go to mad. You should get the full scale of lights with a bit of luck.

 

thanks for the replies...

tried all of the above, nothing.

as soon as you turn the ignition on, the lower green light comes on.

the only time it does anything different is when you turn the ignition off, the light goes off.

 

If the green light is on you are obviously getting a live and a ground.

The possible causes of it not working beyond this are:

a) wiring to the sensor is incomplete (try doing a continuity test to the sensor from the knocklink with a meter) there may be a break in the wire or a bad connection - check particularly connection from the sensor to the wires. The wires with the little crimps on should be pushed into the connector til they click and lock in place.
b) you are not tapping the sensor hard enough. Put a long screwdriver point on the bolt which secures the sesnor and tap the other end of the driver with a spanner or similar. Do it about as hard as you would knock on a door. Don't be shy but don't whack the crap out of it either.
c) duff sensor
d) duff knocklink board. There have been instances in the past of badly soldered LEDs on the board but by and large these seem to be sorted nowadays. Take the box apart and check to see that the LEDs are properly soldered to the board. This problem usually effects only a couple of LEDs, not all, so I would doubt this will be the issue, but you never know.

hope that helps

 

As an addition to whats already been said your sensor is it a Bosch sensor ?

It has been said that the sensors supplied with the BR Development Knocklink are just not a patch on these Bosch sensors and have caused grief in the past. Most people do install Bosch sensors. Worth checking that out perhaps. Its already been said but some of the earlier KL boxs did have a few problems on the circuit boards. Can you borrow another box at all from some where ?