Mazda 6 Service Manual: No.12 torque converter clutch (tcc) non-operation

No.11 shift point is high or low

No.13 no kickdown

Other materials:

Mazda 6 Service Manual: Dtc c1148, c1158, c1168, c1178, c1233, c1234, c1235, c1236
Caution When attaching the tester lead to the ABS (ABS/TCS) HU/CM harness connector, the SST (49 G066 001) must be used. (See ABS (ABS/TCS) HU/CM INSPECTION.) Diagnostic procedure ...

Mazda 6 Service Manual: Antilock Brake System (ABS)
The ABS control unit continuously monitors the speed of each wheel. If one wheel is about to lock up, the ABS responds by automatically releasing and reapplying that wheel's brake. The driver will feel a slight vibration in the brake pedal and may hear a chattering noise from the brake system ...