Chart C Improper Air Delivery

CIRCUIT DESCRIPTION

The Electronic Climate Control (ECC) Head will direct the blended air in one of several air delivery modes. All outlets are directed air by commanding the Programmer to energize specific vacuum valves feeding the appropriate combination of mode valve actuators. The ECC Head determines the proper air delivery mode based upon the current program number and CCP settings.

TEST DESCRIPTION

Numbers below refer to circled numbers on the diagnostic chart.

1. Verifies commanded valve position so actual air delivery can be checked.

2. Checks if fault is due to vacuum source or distribution of vacuum.

3. Checks if fault is due to circuit leaks, stuck valves, or faulty Programmer.