SLS voltage diff sensors

I swapped sensors early on and nothing changed-the right sensor that I knew was working stopped functioning when put on left side. I'm going to try your latest suggestion now.

I'd be getting my multimeter out and checking the volts at the sensor itself.

It's quite possible the wiring is corroded, and the SLABS ECU is fine!

Well I got it to level half a dozen times in the 'sls calibration' section, then followed instructions to save to ECU, changing different settings in 'settings'. In settings I tried 'ECU calibrated' the yes and no setting, when to 'set target values' section and put in 150. Anyway each time I turn on ignition or close down nanocom I can hear the exhaust valve click open and deflates the system. ???
I have a friend coming from the states in a week. Can you make a guess at what parts are most likely the prob. My guess would be a sensor and a new ECU.
Also can you recommend a parts house in US? I've only used UK places in past?
Thanks

Cyn said:

I swapped sensors early on and nothing changed-the right sensor that I knew was working stopped functioning when put on left side. I'm going to try your latest suggestion now.

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then the sensor is good and there's a problem with the wiring from ECU to the sensor or with the ECU, check for corrosion at the ECU plug cos water ingress it's common there... or the wiring is chaffed somewhere between the ECU and the sensor, as David said now it's measurement time for output at the ECU - C0654 pins 1-2(earth) and if there is 5V continuity check on the wires..., if no 5V output there the ECU is fubard it's normal for the system to deflate if it doesnt get signal from one sensor...

I can't see my last message. Anyway it said in detail that I leveled car many times and stored in ECU but as soon as I close nano or turn on ignition I hear the exhaust valve click open and lowers car

Cyn said:

I can't see my last message. Anyway it said in detail that I leveled car many times and stored in ECU but as soon as I close nano or turn on ignition I hear the exhaust valve click open and lowers car

Click to expand...

i saw that and i told you it's normal as long as one sensor's signal is missing at the ECU ... and explained also detailed what to do

Ok I put volt meter to both pins- 1 & 4 of 0654 at ecu -and both read 5 V. Also nano reads 5V when plug is disconnected- goes back to .02 when plugged back in. Does mean wire is bad from ECU to sensor?

Put continuity tester on frame and on pin 2 and it says ok.
I'm not sure if I should be grounding meter somewhere else?

check continuity to earth on wire from pin 1 also check resistance between pins 1 - 2 , 1 - 3 (with ECU and sensor disconnected) on the part which goes to sensor... it must be open circuit ..., if not the wiring is chaffed

Put multimeter on supply to sensor (at sensor) and there is no voltage

Oops wrong! There is 5 V When I connect to supply and earth

the wiring to sensor it's gone IMO, if you have 5V on pin 1 with C0654 disconnected at ECU and plug back to ECU with the sensor disconnected the voltage drops it means it's short to earth on the supply wire...that's why i told you about hose measurements to make 100% sure

Ok There is continuity from pin 1 to frame ground. Btwn pin 1 and 2 the ohms off the scale ( I don't know how to read). From pin 1 to 3 it was much less ( like a quarter of the scale) as you can see I'm not electrical savy best I can do is follow instructions - maybe

At this point I'm confused. Can I have a recap of your thoughts?

Cyn said:

Ok There is continuity from pin 1 to frame ground. Btwn pin 1 and 2 the ohms off the scale ( I don't know how to read). From pin 1 to 3 it was much less ( like a quarter of the scale) as you can see I'm not electrical savy best I can do is follow instructions - maybe

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if these readings were with plugs disconnectd at both sides and you didnt mix the pins it's 100% that the wiring is chaffed as on pin 1 must go the 5V supply to sensor and according o your measurement is short to ground ...that's why the voltage drops when you plug back the connector

so final conclusion: IF with plugs disconected both sides you have earth on pin 1 at ECU side (grey/yellow trace wire) then it's short to earth on the wiring somewhere...then you can go to C0391/0377 , disconnect it and measure on pin 9 both sides(same colour wire) 0391 goes to sensor and 0377 to ECU to see on which part is the short

Awesome!
Where is co391?

i thought that you found C0654 pin disposals in RAVE so there at connector views is C0391 too, see attachment

No I found it in my 'WorkshoP Manual 1999-2003. I thought that was the same publication as Rave- guess not. Thanks for the picture.
More fun to come! Thanks

I believe I made mistake. When you said to test pin 1 for continuity I used pin1 on ECU not the connector. When I check the connector pin 1 I get no continuity to ground. Now what?

Cyn said:

I believe I made mistake. When you said to test pin 1 for continuity I used pin1 on ECU not the connector. When I check the connector pin 1 I get no continuity to ground. Now what?

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Look in RAVE for the earth point and clean it.