Mazda 6 Service Manual: No.7 no shifting

No.6 low maximum speed and poor acceleration no.7 no shifting

No.8 does not shift to fourth gear (4gr)

Other materials:

Mazda 6 Service Manual: Selector lever disassembly/assembly
1. Disassemble in the order shown in the figure. 2. Assemble in the reverse order of disassembly. Connector Disassembly Note 1. Insert a thin piece of metal from the terminal side of the connector, and press down the terminal locking tab. 2. Pull the terminal out of the connector. ...

Mazda 6 Service Manual: Intermittent concern troubleshooting
  Vibration Method 1. If malfunction occurs or becomes worse while driving on a rough road or when engine is vibrating, perform the steps below. Note There are several reasons vehicle or engine vibration could cause an electrical malfunction. Some of the things to check for are: ...