reading rear suspension system fault codes, 03 GX470

[JohnBarnes]

Does anyone know how to do this? I do not have access to a code scanner.

I heard there may be a blinking light method.

I would like to know which light on the cluster to look out for, and how to get the system to start the blink sequence.

 

[DNGRZN]

Does anyone know how to do this? I do not have access to a code scanner.

I heard there may be a blinking light method.

I would like to know which light on the cluster to look out for, and how to get the system to start the blink sequence.

I don't know if a standard code scanner would work. If there is a blinking light method for a Toyota specific system like that I've not heard of it. I will say that I got awfully sick of paying Lexus to look at my car for tiny crap. The Toyota tis software is pretty much invaluable to a diy'er.

I've heard that you can find it online and that amazon has a store that sells the DLC to USB tool for about 50$.

I use my tis laptop from when I had my shop...leaps and bounds more helpful than I ever dreamed.

If you can make it to Portland Oregon I'll plug in for you and tell you what it says.

 

[JohnBarnes]

I have one of the OBD2 to bluetooth adapters. I also have an app for my android phone. But the app only reads codes from the engine computer.

the system codes are all listed as CXXXX/YY. the YY number is and has always been the blink pattern code for Toyota way back to 1995 when they had OBD1.

Such info might be in a factory repair manual ( don't have one).

 

[IAmDan]

Alldata says to jump pins 4 and 13 of your DLC with the ignition off, then turn it on and your height control off light in the dash will blink the code. Haven't tried it yet, but sounds legit.

Sent from my SAMSUNG-SM-G900A

 

[langsen]

The OBD2 reader won't read these codes, but the jumper between the pins does work.

 

[JohnBarnes]

Thanks a lot for the information.

 

[JohnBarnes]

2 fault codes were obtained: 51 = continuous electric current to height control computer, 76 = speed sensor circuit.

Thanks to all who helped. Now the work begins in finding out exactly whether code 51 means the compressor is dead and buried.

 

[JohnBarnes]

Problem was resolved by first making sure the compressor was still working, then removing the air springs and checking for leaks. The latter test confirmed both were leaking.

The compressor (has 4 pins) was tested by disconnecting the vehicle harness and directly powering the compressor using a dc power supply.

One thing I learned is that if code 51 is set, it apparently means the height control computer shuts off the compressor because of excessive current draw, keeping it from burning out.

The whole system would benefit from a pressure sensor to detect leaks, just like those used in the fuel tank leak detection systems. If you are charging $50K and more for a luxury vehicle, get it right.