Trouble Code 45 (Solenoid Valve Brake Band)

SOLENOID VALVE BRAKE BAND
Explanation
This solenoid valve brake band is checked completely by the control unit during the initialization phase by briefly activating it. The following defects can be detected during operation depending on the status of the solenoid valve:

- Active: Short to ground. plausibility (driver transistor defective)
- Passive: Short to positive, break

Effect of Defect
Mechanical emergency program.

Possible Cause
Wire or winding of solenoid valve defective, or driver transistor defective.

Troubleshooting
Perform component activation. Measure signals. Ground is constantly applied at control unit Pin 54. When active, control unit switches positive (approx. battery voltage) to Pin 45.