Lotus Evora - Air Conditioning System

Page 62
Lotus Service Notes Section EMR
Air Conditioning System
P0646 A/C Clutch Relay Control Circuit Low
P0647 A/C Clutch Relay Control Circuit High
Description
The ECM controls the A/C clutch relay in response to the A/C driver request and ECM control logic.
Component connections
Relay Connector Description ECU Pin ECU Connector
1 Ignition supply (fuse R11)
2 AC clutch relay control F2 48 Way (Right)
Monitor:
• Continuous
Enable Criteria:
• Enginerunning
Disable Criteria:
• None
Potential failure modes:
• P0646–A/Ccompressorrelaywiringopencircuitorshortedtoground
• P0646–FuseR11
• P0647–A/Ccompressorrelaycircuitshortedto12V
• A/Ccompressorrelayfailure
• ECUoutputcircuitfailure
Diagnostic Mask:
• Theservicelightwillbeilluminatedfor30secondsafterenginestartifthefaulthasbeenpresentforthe
previous two trips.
2009/02