Transmission Does Not Shift

Transmission does not shift

Diagnostic Procedure:

1. Input shaft (mainshaft) speed sensor defective

2. Output shaft (countershaft) speed sensor defective

3. Engine output low

Also check for:

- Check for a stored DTC, and check for loose connectors.
- Check the input shaft (mainshaft) speed sensor and the output shaft (countershaft) speed sensor installation.
- Check the engine control system
- Check the fuel pressure. Testing and Inspection
- Check for exhaust restrictions.
- Check for intake restrictions.