Porsche Codes 29 and 4460

[questforbalance]

Can anyone tell me how to diagnose these codes? I used my Durametric and got the following:

4460 - pressure sensor ABS/PSM

29 - AC outs/recirc. air fl. MOT fault

 

Some history: I got a ABS/PSM warning indicator on dash. I then replaced the brake sensor light. I removed the piece of duct under the dash, replaced the brake light sensor and the ABS/PSM warning light went away. I cleared all fault codes after the job, and I found these codes again.

 

Any assistance would be greatly appreciated.

 

[Loren]

A malfunction of the stop light switch can cause this fault. The stop light switch must have switched before a brake pressure is recognized. When the brake pedal is actuated, the stop light switch and the brake lights are triggered.

That is the most common cause - I would start there.

[questforbalance]

Hello Loren, Thanks for the response. I did change the brake light switch. Shouldn't this code be gone? Also, do you have any idea what is causing the Porsche code 29, AC outs/recirc. air fl. mot fault?

[Loren]

It can still cause a fault code if the switch is not properly adjusted (covered elsewhere here).

 

Fault code 29 -- Motor of outside air / re-circulation valve Signal implausible Fault code 29

 

1. Check outside air / re-circulation valve for smooth operation.

2. Unplug connectors A, B, C and D from the heating/air-conditioning control.

3. Unplug connector from outside air / re-circulation valve drive motor.

4. Connect ohmmeter to connector D 13 and drive motor connector pin 1. 

Display: < 5 ohms

Connect ohmmeter to connector D 5 and drive motor connector pin 2.

Display: < 5 ohms

Connect ohmmeter to connector B 17 and drive motor connector pin 3.

Display: < 5 ohms

Connect ohmmeter to connector C 8 and drive motor connector pin 4.

Display: < 5 ohms

Connect ohmmeter to connector A 12 and drive motor connector pin 5.

Display: < 5 ohms

5. Check wire from connector D 13 to drive motor pin 1 for short to B+ and short to ground.

6. Check wire from connector D 5 to drive motor pin 2 for short to B+ and short to ground.

7. Check wire from connector B 17 to drive motor pin 3 for short to B+ and short to ground.

8. Check wire from connector C 8 to drive motor pin 4 for short to B+ and short to ground.

9. Check wire from connector A 12 to drive motor pin 5 for short to B+ and short to ground.