Mazda 6 Service Manual: No.19 excessive shift shock on torque converter clutch (tcc)

No.18 excessive shift shock is felt when upshifting and downshifting

No.20 noise occurs at idle when vehicle is stopped in all positions/ranges

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Mazda 6 Service Manual: Foreword
When the customer reports a vehicle malfunction, check the malfunction indicator lamp (MIL) indication and diagnostic trouble code (DTC), then diagnose the malfunction according to following flowchart. - If a DTC exists, diagnose the applicable DTC inspection. (See DTC TABLE.) - ...

Mazda 6 Service Manual: Coil removal/installation
Note Do not remove the coil unless you are replacing it. When only the coil is replaced, the immobilizer system reprogram procedure is not necessary. 1. Disconnect the negative battery cable. 2. Remove the column cover. 3. Remove in the order indicated in the table. 4. Install in ...