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2008 - MX-5 - Transmission/Transaxle

NO.7 NO SHIFTING [SJ6A-EL]



7

No shifting

DESCRIPTION

  • Single shift range only.

  • Sometimes it shifts correctly.

POSSIBLE CAUSE

  • When the gear position is fixed in 4GR or 5GR due to the fail-safe operation, malfunction is in the AT.

    • Clutch burnt (C1 clutch, C2 clutch, C3 clutch, B1 brake, B2 brake, B3 brake, B4 brake)

      • 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

      • VSS malfunction

      • Turbine sensor malfunction

      • Sensor GND malfunction

      • Shift solenoid A malfunction

      • Shift solenoid B malfunction

      • Shift solenoid C malfunction

      • Shift solenoid D malfunction

      • Shift solenoid E malfunction

      • Line pressure control solenoid malfunction

      • Shift solenoid F malfunction

      • Shift solenoid G malfunction

      • Control valve body malfunction

    • 4GR or 5GR is fixed (Operation in fail-safe function)

      • Short or open circuit in wiring harness

      • Poor connection of connector

      • Poor ground of shift solenoid

      • Malfunction of electronic parts of output and input system

    • TFT sensor malfunction

    • TR switch malfunction

    • TCM malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

  • With the ignition switch at the ON position, does the gear position indicator light indication corresponded 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

  • 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.

3

Yes

Go to the next step.

No

Replace the TFT sensor.

4

  • Stop the engine.

  • Inspect following solenoid.

    (See SOLENOID VALVE INSPECTION [SJ6A-EL].)

    • Shift solenoid A

    • Shift solenoid B

    • Shift solenoid C

    • Shift solenoid D

    • Shift solenoid E

    • Line pressure control solenoid

    • Shift solenoid F

    • Shift solenoid G

  • Are they normal?

Yes

Inspect the ATF condition.

No

Replace the control valve body.

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

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

5

  • 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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