AdamG
Senior Member
- Joined
- May 24, 2009
- Messages
- 531
- Reaction score
- 4
- Location
- Bromley, Kent
- Your Mercedes
- S320CDI (2003)
Hi,
I have been trying to get to the bottom of a problem with my slk's compressor clutch.
First I noticed a lack of power then read the codes with star and came up P0806 "compressor output stage open circuit"
I tried activating it with star and nothing happened.
I checked the connector and there is 12v on one pin and the other one is connected to pin 21 on the ecu and shows as a good connection with a multimeter.
I checked the resistance of the clutch: about 4 ohms.
I tested the clutch by quickly connecting the disconnected plug to 12v and it clicked and moved fine.
It looks as though the ECU is not grounding the clutch. Has anyone experienced this before? Could it be a dry joint or does the ecu control a seperate relay somewhere?
The wis suggests the clutch is directly controlled by the ECU but I'm never too sure about the wis circuit diagrams
Any suggestions greatly appreciated.
Cheers
Adam
I have been trying to get to the bottom of a problem with my slk's compressor clutch.
First I noticed a lack of power then read the codes with star and came up P0806 "compressor output stage open circuit"
I tried activating it with star and nothing happened.
I checked the connector and there is 12v on one pin and the other one is connected to pin 21 on the ecu and shows as a good connection with a multimeter.
I checked the resistance of the clutch: about 4 ohms.
I tested the clutch by quickly connecting the disconnected plug to 12v and it clicked and moved fine.
It looks as though the ECU is not grounding the clutch. Has anyone experienced this before? Could it be a dry joint or does the ecu control a seperate relay somewhere?
The wis suggests the clutch is directly controlled by the ECU but I'm never too sure about the wis circuit diagrams
Any suggestions greatly appreciated.
Cheers
Adam