Climate control hidden codes

[X-UFO]

996 2001 C2

Does anyone know what the codes are on the climate control?

In my previous Audis of a similar year to the 996 I could access codes on the climate control display to get engine temp, voltage etc etc. This info was accessed by pressing the 'recirc' button and the 'up' button at the same time. This then gave access to (from memory) up to 49 or more readings.

The access on the 996 climate control gives the same codes by pressing certain buttons but I'm not sure what each reading is and also it only goes up to code 39C.

For example on the Audi 20C was voltage, 49C was Coolant temp, 48C display test.

Anyone have a list of what each of the diagnostic codes are?

[Ray Luxury-Yacht]

Which buttons do you press? I want a go.

[woogie]

I pressed a couple tonight and got it to change to farenhite , I changed it back to centigrade though.

[X-UFO]

I'll check again tomorrow. It's slightly different to the Audi way of bringing the codes up and took a bit of experimenting to get the display to come up. Recirc and + changes from degrees C to F (I think).

It's something like 'hold the recirc' button and hold the 'up' button for about 5 seconds.

I'll check tomorrow and post it in here.

Here's a link to the Audi TT info on the codes. http://www.wak-tt.com/climate/climatecodes.htm

[X-UFO]

OK here goes

Press and hold the UP button then at the same time press and hold the RECIRC button in.

After 5 seconds or so of holding the buttons in the display changes to 1C.

Let go of the buttons.

To see the reading corresponding to 1C press the button on the climate control below the UP button
(this is the button for directing air through the centre dash vents).

To move back to the 1C press that button again. To go to 2C, 3C, 4C etc etc press the + button on the temperature control (not the fan speed +).

I would guess that 6C is coolant temp as mine varies between 90degrees and 94degrees.

There are quite a few more.

To exit this mode press the AUTO button.

[PolarExpress]

X-UFO said:

OK here goes

Press and hold the UP button then at the same time press and hold the RECIRC button in.

After 5 seconds or so of holding the buttons in the display changes to 1C.

Let go of the buttons.

To see the reading corresponding to 1C press the button on the climate control below the UP button
(this is the button for directing air through the centre dash vents).

To move back to the 1C press that button again. To go to 2C, 3C, 4C etc etc press the + button on the temperature control (not the fan speed +).

I would guess that 6C is coolant temp as mine varies between 90degrees and 94degrees.

There are quite a few more.

To exit this mode press the AUTO button.

Post of the year!

[HRG]

You can see *true* speed in KPH too. Stick the display on that, swing your speedo to KPH and see the difference

[jjcodex]

Very very cool!

Gonna play later!

JJ

[USS Bozeman]

Nice !

Do we know what the codes actually correspond to - is there a list anywhere ?

[X-UFO]

USS Bozeman said:

Nice !

Do we know what the codes actually correspond to - is there a list anywhere ?

That was the reason for my original post. I assumed this had been covered somewhere as I'm failry new to this Porsche thing. As I said above, I think 6C is the coolant temp. As with the Audi sometimes useful as it's more accurate than the gauge needle.

If you try the codes as you drive along you can see some values changing. One of them (can't remember which) is like the Audi one with a display test i.e. it shows all of the display segments on the climate control.

[supermono]

I there the number of litres of fuel per hour being injected? Reason for asking is this was the test for the MAFs on the M5. IIRC at wide open throttle just as the rev limiter came in you'd want to see ~130 litres/hour being poured in, but if your MAF was bad you'd see a lot less (<100) and an unstable figure.

I found it very useful for getting mine running right, be interesting to see the figures for 911s.

SM

[Rumplestiltskin]

BTW - this works on my '98 Boxster too...

At least one of the variables is user changeable, I have no idea what it's for though. The temp gauge is a very useful tool, especially in traffic jams on hot days.

I also vote this 'Post of the year', until someone comes up with a list of the codes and their meaning. I bet there's a lot to be learned in those codes.

[supermono]

Rumplestiltskin said:

BTW - this works on my '98 Boxster too...

At least one of the variables is user changeable, I have no idea what it's for though. The temp gauge is a very useful tool, especially in traffic jams on hot days.

I also vote this 'Post of the year', until someone comes up with a list of the codes and their meaning. I bet there's a lot to be learned in those codes.

The user changable one on the M5 was a fuel consumption computer correction factor.

SM

[Mousem40]

I've tried it on my MKII GT3 and it doesn't work. That probably applies to all Facelift 996s?
I'd love to know the oil temp, I can't believe the 996 doesn't have a gauge for that.

[baptistsan]

Rumplestiltskin said:

BTW - this works on my '98 Boxster too...

At least one of the variables is user changeable, I have no idea what it's for though. The temp gauge is a very useful tool, especially in traffic jams on hot days.

I also vote this 'Post of the year', until someone comes up with a list of the codes and their meaning. I bet there's a lot to be learned in those codes.

I'm going to hold you to that :-)

This is what I have, apologies for the missing ones.

0c - ERL
1c - Oil Temp
2c - Inside Temp - From the Sensor mounted in the Aspirator Assembly at the side of the Dash
3c - Outside Temp - From the Sensor inside the Air Inlet of the A/C Unit
4c - Outside Temp - From the Sensor in Front Grill of the Radiator. Data is fed to the Climatronic from the Instrument Cluster. When not moving, the Instrument Cluster OBC Temp Display retains it's last setting until moving. This is to prevent heat emanating from the Radiator affecting the Temp Sensor. The Climatronic uses the lower of the two values in determining Fresh-Air Temp.
5c - Outside Temp - matches OBC outside temp display
6c - Coolant Temp
7c - Footwell Discharge Temp
8c - Sun Sensor (dash top)
9c - Sun Sensor
10c- Passenger Compartment Fan Speed
11c- Passenger Compartment Fan Voltage
12c- Temperature Mix Flap Command (1=COLD, 100= HOT)
13c- Temperature Mix Flap Position
14c - Central Flap Command
15c - Central Flap Position
16c - Footwell/Defrost Flap Command
17c - Footwell/Defrost Flap Position
18c - Recirculation Valve Command (1=OFF, 100=RECIRC)
19c - Recirculation Valve Position (feedback)
20c - Vehicle Speed in kph, updates once per second. This is True Speed, not the Speed+Safety Margin displayed by the Speedometer.
21c - Engine RPM in hundreds, also updates once per second
22c - ?
23c - ?
24c - Sun Sensor, Exterior Lights Switch, and Panel Lights control (term.
58 & 58d voltage) - used for A/C Panel Display Illumination
25c - ?
26c - ?
27c - ?
28c - Fan Speed
29c - ?
30c - Engine Run Time in seconds (255max.) (=0Xff)
31c - Timing Counter
32c - Displays Test
33c - Software Version (usually 3.4)
34c - ?
35c - Outside Temp from Inlet Sensor (filtered)
36c - Temp

[mikeo996]

Great stuff, can't wait to play.

Presumably it resets when you switch the engine off - or could you permanently e.g have oil temp displayed?

And presumably the climate control just keeps on doing it's automatic thing whilst you're doing this?

[mikeo996]

To answer my own questions - it does reset when you switch off, but it is easy enough to switch between climate control and the various functions by using the auto and the centre buttons