Cem read-outs

martinholmesuk · Post by **martinholmesuk** » Mon Feb 02, 2004 10:56 am

I think Gaz is exactly right. From what I've read in VADIS, Volvo have lots of "Keys" which automatically suck out the fault codes from the CEM without having to sit there and count the LED flashes.

If you want to have a go at doing it yourself, this is what VADIS has to say about it:

VADIS wrote:
Test function 1 is used to read out DTCs stored in the ECU of the SRS system

Proceed as follows:
-Insert selector lead in terminal 7 of the diagnostic tester.
-Ignition ON.
-Press the button. Keep it pressed for about 1 second.
-Read off and note the DTC indicated by the LED.
-Press button again to check for further DTCs.

After the readout of all DTCs the memory has to be erased.
-Proceed as follows:
-Press the button for at least 5 seconds.
-Release the button. The LED lights.
-Press the button again for at least 5 seconds.
The DTCs are now cleared.

And these are what the DTC codes mean:

1-1-1 : System is fault free
1-1-2 : Crash sensor - Internal fault
1-2-7 : Warning lamp circuit - Open-circuit or short-circuit
2-1-1 : Steering wheel module - Resistance too low
2-1-2 : Steering wheel module - Resistance too high
2-1-3 : Steering wheel module - Short circuit to battery
2-1-4 : Steering wheel module - Short circuit to ground

Ben.

OK,

1-1-1 : System is fault free

How do you know this? Does it flash 3 times? I'm confused to how it tells you.

2-1-4 : Steering wheel module - Short circuit to ground

Really confused now. Are there meant to be led's on each port?

I was over Mat's place and it said I had a Accelerator position sensor fault.

I want to re-check this because my car is running bad and feels very dead. I am going to change the auto box oil also.

dragon · Post by **dragon** » Mon Feb 02, 2004 11:14 am

There is one LED. Basically the sets of flashes are seperated by 3 seconds of nothing, so for 1-1-1, it will flash once, wait 3 secs, flash once, wait 3 secs, flash once.

For 2-1-4, it will flash twice, then wait 3 secs, then flash once, wait 3 secs, flash 4 times.

Be sure you're performing the right test for the result though - I thought I had some problems with my car but it turned out I'd instigated the wrong test - read the relevent sections in VADIS (ask for a printout of the relevent page from a Volvo dealer?), it explains it all (basically one of the ports can do more than one test)

martinholmesuk · Post by **martinholmesuk** » Mon Feb 02, 2004 11:36 am

Thanks Dragon, That clears it up!

martinholmesuk · Post by **martinholmesuk** » Mon Feb 02, 2004 11:38 am

Anyone got a list of the codes?

volvofox · Post by **volvofox** » Mon Feb 02, 2004 12:28 pm

hey dragon,..... a good coadmin would have say in a dark voice.." Hey bad boy... this is in dept !!!"

dragon · Post by **dragon** » Mon Feb 02, 2004 12:29 pm

volvofox wrote: hey dragon,..... a good coadmin would have say in a dark voice.." Hey bad boy... this is in dept !!!"

OK OK, I get the message

Moved to in depth technical questions --dragon

martinholmesuk · Post by **martinholmesuk** » Mon Feb 02, 2004 12:49 pm

, Anyone got the codes?