Diamante V6-2972cc 3.0L SOHC (1992)
Drive Belt: Technical Service Bulletins
A/C - Belt Lock Controller Operation/Troubleshooting
NO.: TSB-91-55-015
DATE: November, 1991
MODEL 1992 Diamante LS
SUBJECT:
BELT LOCK CONTROLLER OPERATION/TROUBLESHOOTING - SERVICE MANUAL SUPPLEMENT
PURPOSE
This bulletin provides service technicians with A/C belt lock controller general operation and procedures to be followed if you suspect A/C compressor
lock-up.
BELT LOCK CONTROLLER OPERATION
In Diamante LS vehicles, both the A/C compressor and the alternator are driven by the same belt. If the A/C-alternator belt is loose, it may slip when the
A/C is turned on. Belt slippage affects A/C performance and alternator output. The belt lock controller's function is to turn off the A/C compressor clutch
if the belt slips or the compressor locks-up.
By using output from the A/C compressor revolution pick up sensor, the belt lock controller calculates the actual A/C compressor speed relative to
engine speed (see block diagram). If the controller senses an A/C compressor clutch slipping condition (70% slip for 3 seconds or more), the controller
switches oft the A/C compressor clutch. When the controller switches the A/C compressor oft, the NC switch indicator light begins blinking. If the
A/C-alternator belt should break or if the compressor does not turn, the controller switches off the compressor clutch and causes the indicator light to
blink.
