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2008 - MX-5 - Transmission/Transaxle

NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION [SJ6A-EL]



12

Torque converter clutch (TCC) non-operation

DESCRIPTION

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

POSSIBLE CAUSE

  • Basically, TCC does not operate when the fail-safe is operating. Verify the DTC at first. If the TCC operates when driving at high speeds only, the malfunction (improper adjustment) is in the M range switch circuit or TR switch circuit.

    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.

  • TCC slippage, burnt

    • Line pressure low

      • Incorrect throttle position signal

      • Incorrect accelerator pedal position signal

      • Incorrect engine speed signal

      • Incorrect engine coolant temperature signal

      • Incorrect engine torque signal

      • Turbine sensor malfunction

      • VSS malfunction

      • Output solenoid valve system malfunction (Sticking)

      • TCC control solenoid malfunction

      • Control valve body system malfunction (Poor operation, sticking)

      • TCC hydraulic pressure system malfunction

  • Accelerator pedal position sensor malfunction (Not operating linearly)

  • Turbine sensor or VSS malfunction

  • Operation of fail-safe function.

    • Short to power or GND at TCC control solenoid related circuit.

NOTE:

  • Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION [SJ6A-EL].)


Diagnostic procedure

STEP

INSPECTION

ACTION

1

  • With the ignition switch at the ON position.

  • Does the gear position indicator light indication correspond to the selector lever position?

Yes

Go to the next step.

No

Go to No.27 “GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M RANGE”, or No.28 “GEAR POSITION INDICATOR LIGHT ILLUMINATES IN D RANGE OR P, N, R POSITIONS”.

2

  • Disconnect the TCM.

  • Is the resistance between the TCM ground terminal 1P, 1X and the body GND less than 5.0 ohms?

Yes

Go to the next step.

No

Repair open ground circuit.

3

  • Access the following PCM PIDs using the M-MDS.

    • RPM

    • APP

    • TP

    • ECT

    • ENG_TRQ

  • Are PIDs value normal?

Yes

Go to the next step.

No

Inspect and repair suspected PID related part.

4

Yes

Go to the next step.

No

Replace the TFT sensor.

5

Yes

Go to the next step.

No

Replace the control valve body.

(See CONTROL VALVE BODY REMOVAL [SJ6A-EL].)

(See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)

6

Yes

Inspect the ATF condition.

No

Replace the torque converter.

7

  • Verify test results.

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

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

      • If the vehicle is repaired, troubleshooting completed.

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




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