Test O: Vehicle Shifts Differently With A/C Engaged: Notes
NOTE:
When the A/C is turned on and the dual pressure switch is closed, PCM receives battery voltage and then determines the A/C compressor has been signaled to engage. When the A/C compressor is engaged, the PCM increases line pressure and briefly delays shift points to compensate for the additional engine load. The cause is probably a faulty dual pressure switch circuit or a defective PCM.