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Porsche Codes 29 and 4460

questforbalance
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questforbalance Member

questforbalance

Posted
Posted

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.

 

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Loren Member

Loren

Posted
  • Admin
Posted

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 Member

questforbalance

Posted
  • Author
Posted

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?

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Loren Member

Loren

Posted
  • Admin
Posted

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.

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