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2008 - MX-5 - Transmission/Transaxle

NO.2 VEHICLE MOVES IN N POSITION [SJ6A-EL]



2

Vehicle moves in N position

DESCRIPTION

  • Vehicle creeps in N position.

  • Vehicle creeps if brake pedal is not depressed in N position.

POSSIBLE CAUSE

  • If the vehicle moves in N position, basically, the malfunction is in the AT. Since a malfunction in the sensor circuit or output circuit is the cause of the malfunction in the AT, inspect the sensors, output circuit, and the related wiring harnesses.

    • Clutch burnt (C1 clutch, C4 clutch, One-way clutch)

      • Line pressure low

      • Shift solenoid B malfunction

      • Shift solenoid C malfunction

      • Shift solenoid E malfunction

      • Shift solenoid G malfunction

      • Control valve body malfunction

    • Selector lever position disparity (Although the selector indicator shows N position, the hydraulic circuit shows D range or R position)

      • TR switch mis-adjustment

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

  • Does the vehicle creep when selector lever is moved slightly in N position?

Yes

Go to the next step.

No

Inspect and adjust the selector lever and TR switch.

(See SELECTOR LEVER INSPECTION.)

(See TRANSMISSION RANGE (TR) SWITCH INSPECTION [SJ6A-EL].)

(See TRANSMISSION RANGE (TR) SWITCH ADJUSTMENT [SJ6A-EL].)

2

Yes

Replace the AT (clutch slippage, worm).

(See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [SJ6A-EL].)

No

Inspect the coupler component.

If normal, replace the control valve body.

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

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

3

  • 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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