tkacki

Hi,

There is a problem with my KLR. Description:

1. Boost limited to 0,3 positive preassure. 1,3 on the gauge.
2. Blink code reader shows nothing. LED is coninously lit all the time not matter how high I rev or idle.
3. KLR is OK. Relaced KLR with good one - same problem.

I suspect line #24 on KLR plug - trigger line from DME. Anyone knows what is correct voltage / signal on this line ?

Car is 87 Turbo (not S).

Any input is highly appreciated.

Luis de Prat

Is this car in the factory configuration with a cycling valve? If yes, have you replaced it?

tkacki

Car is factory configuration in turbine control area. Cycling valve is new.

Luis de Prat

Well, I just experienced an on/off boost situation with my '91 that was a combination of bad speed/reference sensors and broken solder joints in the DME itself.

Have you taken the DME apart and looked for burnt areas or bad solder joints? The 1987 boxes are relatively easy to find. 1991 are another story!

tkacki

KLR receives RPM signal directly from DME (DME pin #21 -> KLR pin #9). I have checked this signal with osciloscope. The signal is OK - same wire goes to RPM meter in instrument cluster and it works.

My KLR does nothing - there is no output from KLR to timing valve.

Should test LED be off during normal operation on idle (in case when no error codes are present) ?

jerome951

Is your voltage sufficient? In a low voltage situation the KLR will shut itself down.

tkacki

Battery voltage is OK. I will check the voltage on KLR connector. Thanks jerome.
One more thing - KLR produces signal to boost gauge. I can read the preasure in instrument cluster.

jerome951

Are you sure it's an electrical problem and not a boost leak?
When the problem started occuring, did anything in the system change (e.g. new timing valve, removed and re-installed some vacuum hoses, etc.)?

tkacki

No change, so I assume electrical. This continously lit LED......It should go off when I start the engine, but it won't.

Charging system is OK. When I bypass CV, I have lots of boost.

alex_cristocea

I have an 87 951 and I have the same problem. I remeber i have tested a year ago with disconected tps and give the corect code. 3 weeks ago, when running on highway on heavy rain my engine start to run porly and when I got home I've tryed to test with a blink code tester but there was no blink. The led just stayed on. My boost gauge also indicates max ~1.6 - 1.7 bar max. Also when I switch the ignition at second step (engine still off) the boost gauge dosent indicate 1 bar, it;s a little bit on the left side indicating a negative pressure.

Luis de Prat

This sounds like water is getting into the passenger side footwell.

Pull out the battery and look for corrosion or cracking that might let water through. If you can't see anything, park the car in a dark place or wait until it's dark out and put a flashlight behind the DME facing upwards.

Then go back to the battery compartment. If you see any light coming through, you'll know how the water is getting down there.

alex_cristocea

I'll check that out tomorow, but I don't think that may be the cause. If I'll wash the car or if it rains on it I don;t have this promblem it only show whe driving the car above 60 km/h.

tkacki

Problem solved There were no pulse on pin 24 of KLR - it is the crankshaft speed signal from DME (amplified and reformated, 12vpp). The cause was a bad solder point.

Thanks for Your support.

reno808

good stuff