Diagnosis conditions

No control module fault stored. No fault on the supply voltage (5 Volt).

Signal implausible DTC 29

Fault, DTC

Possible causes, elimination, notes

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 plus and short to ground.

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

Signal implausible

1. Check refrigerant (see Page 87 -13).

2. Check high/low pressure switch.

Battery positive voltage must be present at terminal 1 on the high/low pressure switch (with ignition on) if there is enough refrige-

3. Check heating activation relay.

Battery positive voltage must be present at terminal 87 if the ignition is switched on.

4. Check the air conditioning compressor relay.

Battery positive voltage must be present at terminal 30 (with the ignition on) and high/low pressure switch actuated. Ground must be connected to terminal 31. Battery positive voltage must be connected to terminal 86 when the engine is started.

Ground must be connected to terminal 85 when the DME switches on the air conditioning compressor (7 seconds delay).

5. Pull off connector D on the heating/air conditioning control.

Porsche Classic Models

Porsche Classic Models

The History of Porsche Cars through its generational changes. A must have ebook for any Porsche fanatic, this ebook is a reference book for Porsche enthusiasts. Discover all there is to know about the greatest Porsches ever made. All models are fully described and illustrated providing a definitive production history plus an accurate guide to original specs and equipment.

Get My Free Ebook


Post a comment