Mazda 3 Service Manual: Torque Converter Clutch (TCC) Non Operation [Fw6 A EL]

TROUBLESHOOTING ITEM

Torque converter clutch (TCC) non-operation

DESCRIPTION

• TCC does not operate when vehicle reaches TCC operation range.

POSSIBLE CAUSE

• Signal malfunction

• APP sensor malfunction

• Brake switch malfunction

• CKP sensor malfunction

• ECT sensor No.1 malfunction

• Poor GND

• Torque converter malfunction

Monitor item (Definition)

Unit/Condition

Condition/Specification (Reference)

APP

%

• Accelerator pedal released: approx. 0 %

• Accelerator pedal depressed: approx. 100 %

BOO

OFF/ON

• Brake pedal released: Off

• Brake pedal depressed: On

ECT

°C, °F

• Displays the ECT

V

• ECT is 20 °C {68 °F}: approx. 3.10 V

• ECT is 40 °C {104 °F}: approx. 2.16 V

• ECT is 60 °C {140 °F}: approx. 1.40 V

• ECT is 80 °C {176 °F}: approx. 0.87 V

• ECT is 100 °C {212 °F}: approx. 0.54 V

RPM

RPM

• Displays the engine speed

STEP

INSPECTION

ACTION

1

• Inspect the value at the following PCM PIDs using the M-MDS.

  (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0].)

• APP (APP sensor)

• BOO (Brake switch)

• ECT (ECT sensor No.1)

• RPM (CKP sensor)

• Is there any malfunction?

Yes

Repair or replace any malfunctioning parts according to the inspection result.

No

Go to the next step.

2

• Switch the ignition to off.

• Disconnect the TCM connector.

• Visually inspect for pin deformity, open circuit, or wiring harness non-insulation between TCM terminal 1B and body GND.

• Is there any malfunction?

Yes

Repair or replace any malfunctioning parts according to the inspection result.

No

Replace the torque converter.

(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FW6A-EL].)