- Joined
- Apr 24, 2018
- Messages
- 124
HELP! I have a weird issue with a customer's cluster that I cannot understand. I wonder if anyone on here can explain why this might be happening.
Customer has a 1992 FD and sent me a Knightsport cluster with a reported intermittent tacho. That problem was fixed by me and a few other minor issues I spotted too. I'm unsure whether the cluster came out of the customer's car, or was sourced by him as an upgrade to fit whilst his car is with a mechanic. My final test photo, with all gauges set ~halfway:
Returned to customer, and his mechanic refitted the cluster, but he reported:
The tacho is now OK, but mechanic also later reported no oil pressure display either. The odo display was intermittent.
Another (OEM) cluster was installed in the customer's car and everything works fine. The Knightsport cluster was put into another car and the report was, "the same issues are there".
I requested checks were made on the earth connections to the cluster as, with so many faults present, there had to be a common cause. I'm unsure if this was done, but the problems persisted.
In trying to understand what is happening, I agreed to look at the cluster again, with the thought that maybe something had occurred in transit back to the customer. It arrived yesterday and I put it on bench test, only to find it passed all my tests 100%, as it did when it left me previously
. Here is my latest test photo (coolant light deliberately activated to test it):
I'm completely at a loss to explain why I see a 100% working cluster and the customer reports multiple faults when installed in his 1992 FD and another car. Is there something very odd about a Knightsport cluster in a 1992 car? I've not altered anything on my bench tester to accommodate it, just plugged it in, like I have with ~20 clusters now and it just works.
I'm still thinking a earthing fault, as fuel, collant and pressure gauges all share the same earth, which is separately supplied is the harness. I asked for this to be checked, but unsure if this was done by the mechanic - who I have offered to speak to direct, but he won't call me.....
The only problem with my earthing theory is the tacho works, and it shares the earth with the three gauges - pic of my reference flexi-PCB, not the customer's, marked with the earthing path:
I'd be very grateful for any ideas to explain what is happening here?
Customer has a 1992 FD and sent me a Knightsport cluster with a reported intermittent tacho. That problem was fixed by me and a few other minor issues I spotted too. I'm unsure whether the cluster came out of the customer's car, or was sourced by him as an upgrade to fit whilst his car is with a mechanic. My final test photo, with all gauges set ~halfway:
Returned to customer, and his mechanic refitted the cluster, but he reported:
The tacho is now OK, but mechanic also later reported no oil pressure display either. The odo display was intermittent.
Another (OEM) cluster was installed in the customer's car and everything works fine. The Knightsport cluster was put into another car and the report was, "the same issues are there".
I requested checks were made on the earth connections to the cluster as, with so many faults present, there had to be a common cause. I'm unsure if this was done, but the problems persisted.
In trying to understand what is happening, I agreed to look at the cluster again, with the thought that maybe something had occurred in transit back to the customer. It arrived yesterday and I put it on bench test, only to find it passed all my tests 100%, as it did when it left me previously
. Here is my latest test photo (coolant light deliberately activated to test it):I'm completely at a loss to explain why I see a 100% working cluster and the customer reports multiple faults when installed in his 1992 FD and another car. Is there something very odd about a Knightsport cluster in a 1992 car? I've not altered anything on my bench tester to accommodate it, just plugged it in, like I have with ~20 clusters now and it just works.
I'm still thinking a earthing fault, as fuel, collant and pressure gauges all share the same earth, which is separately supplied is the harness. I asked for this to be checked, but unsure if this was done by the mechanic - who I have offered to speak to direct, but he won't call me.....
The only problem with my earthing theory is the tacho works, and it shares the earth with the three gauges - pic of my reference flexi-PCB, not the customer's, marked with the earthing path:
I'd be very grateful for any ideas to explain what is happening here?
