Mazda 6 Service Manual: No.11 shift point is high or low

No.10 frequent shifting

No.12 torque converter clutch (tcc) non-operation

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Mazda 6 Service Manual: Manual Transaxle Shift Pattern
  The shift pattern of the transaxle is conventional, as shown. Depress the clutch pedal all the way down while shifting; then release it slowly. Your vehicle is equipped with a device to prevent shifting to R (reverse) by mistake. Push the shift lever downward and shift to R.   ...

Mazda 6 Service Manual: Crankshaft position (ckp) sensor removal/installation
Removal 1. Perform the following procedure to making the working space. (1) Remove the Front wheel (RH). (2) Remove the splash shield. 2. Disconnect the CKP sensor connector. 3. Remove the installation bolts to remove the CKP sensor. Installation Caution When foreign material such a ...