Testing Vacuum Control

Vacuum Function Diagram (Shown On Model 123):

Complaints:
Transmission shifts hard.
Transmission slips during gear change.

Test Conditions:
Engine at idle and operating temperature.
Test vacuum lines according to function diagram.
Check orifices (63 and 63a) for blockage.
Modulating pressure correctly adjusted.

Special Tool:

Self Made Tool:

Test Items:
Vacuum control valve, vacuum transducer, electric switchover valve and temperature switch 50°C.

Testing (Part 1):

Testing (Part 2):