Mazda 3 Service Manual: No.12 Torque Converter Clutch (TCC) Non Operation [FS5 A EL]

12

Torque converter clutch (TCC) non-operation

DESCRIPTION

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

POSSIBLE CAUSE

• Basically, the TCC does not operate when the fail-safe is operating. Verify the DTC first.

1. TCC burnt

• (1) Input sensor system malfunction

• TFT sensor

• VSS

• Input/turbine speed sensor

• Sensor ground

• (2) Output solenoid valve system malfunction (Sticking)

• Shift solenoid A malfunction

• Shift solenoid E malfunction

• (3) Control valve body malfunction system (Poor operation, stuck)

• TCC hydraulic pressure system

2. APP sensor malfunction (Not operating linear)

3. CKP sensor malfunction

4. Input/turbine speed sensor or VSS malfunction

5. Brake switch malfunction (Always ON)

6. ECT sensor malfunction

7. Excessive amount of ATF

CAUTION:

• If the TCC is stuck, inspect it. In addition, inspect the oil cooler for foreign particles which may have mixed in with the ATF.

NOTE:

• Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted..

STEP

INSPECTION

ACTION

1

Does the gear position indicator light indication correspond to the selector lever position with the ignition at the ON?

Yes

Go to the next step.

No

Perform the symptom troubleshooting “NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M POSITION” or “NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATE IN P, R, N AND D POSITION”.

(See NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M POSITION [FS5A-EL].)

(See NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATES IN P, R, N AND D POSITION [FS5A-EL].)

2

Inspect the following PCM and TCM PID values using the M-MDS:

(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0, MZR 2.5].)

(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].)

PCM PIDs:

• APP

• RPM

TCM PIDs:

• THOP

• OSS

• TSS

Are the PID values normal?

(See PCM INSPECTION [MZR 2.0, MZR 2.5].)

Yes

Go to the next step.

No

Repair or replace any malfunctioning parts.

3

Disconnect the TCM connector.

Measure the resistance between ground terminal at the TCM connector and body ground.

Is the resistance less than 5.0 ohms

?

Yes

Go to the next step.

No

Repair or replace the wiring harness for a possible open circuit.

4

Measure the resistance between shift solenoid A and E control circuit at the TCM connector and control valve body connector.

Measure the resistance between shift solenoid A and E circuit at the TCM connector and control valve body connector.

Are the resistances less than 5.0 ohms

?

Yes

Go to the next step.

No

Repair or replace the shift solenoid A or E control circuit.

5

Inspect the shift solenoid A and E.

(See SOLENOID VALVE INSPECTION [FS5A-EL].)

Are the shift solenoids operating properly?

Yes

Replace the TCM.

(See TCM REMOVAL/INSTALLATION [FS5A-EL].)

No

Overhaul the control valve body and repair or replace any malfunctioning parts.

(See Automatic Transaxle Workshop Manual FS5A-EL.)

If any problem remains:

• Overhaul the transaxle and repair or replace any malfunctioning parts.

  (See Automatic Transaxle Workshop Manual FS5A-EL.)

6

• Verify the test results.

• If normal, return to the diagnostic index to service any additional symptoms.

• If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.

• If the vehicle is repaired, troubleshooting is completed.

• If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM..