OBD II Fault Code P0646 :

Description of Fault code P0646

A/C COMPRESSOR CLUTCH RELAY CIRCUIT SHORTED TO GROUND

Possible failuer P0646

• A/C Clutch Relay
• A/C Clutch Relay harness (Short to ground)

Diagnostic Procedure using AutoHex II Scan Tool

• When minute current is drawn off on the inactive drive circuit, the short to ground is detected for a set period of time.

Test Conditions using AutoHex tester

• IG ON (II)
• The A/C Clutch Relay is the OFF instruction

Clear Fault codes Conditions

• When minute current is drawn off on the inactive drive circuit, the short to ground is detected for a set period of time.

MIL Status

• Glow ON

Note:

• AutoHex II is a professional Auto diagnostic.
• This fault code is a GERENRIC fault code, some cars may change the meaning of this fault code.
  To get the accurate fault code description you may use AutoHex II

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