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2008 - MX-5 - Transmission/Transaxle

DTC P0781 [SJ6A-EL]



DTC P0781

1-2 shift valve malfunction

DETECTION CONDITION

  • TCM detects 1–2 shift valve malfunction.

    Diagnostic support note:
  • The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles.

  • PENDING CODE is available.

  • FREEZE FRAME DATA is available.

  • The AT warning light illuminates.

  • DTC is stored in TCM memory.

POSSIBLE CAUSE

  • ATF level low

  • Deteriorated ATF

  • Line pressure low

  • Stuck 1–2 shift valve

  • Control valve body malfunction

  • TCM malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
  • Has FREEZE FRAME DATA been recorded?

Yes

Go to the next step.

No

Record the FREEZE FRAME DATA on the repair order, then go to the next step.

2

VERIFY RELATED REPAIR INFORMATION AVAILABILITY
  • Verify related Service Bulletins and/or on-line repair information availability.

  • Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

  • If the vehicle is not repaired, go to the next step.

No

Go to the next step.

3

INSPECT FOR DTC
  • Turn the ignition switch to the ON position (engine off).

  • Inspect for DTCs.

  • Are any other DTCs output?

Yes

Follow the applicable DTC inspection procedure, then go to the next step. (See DTC TABLE [SJ6A-EL].)

No

Go to the next step.

4

INSPECT ATF CONDITION

Yes

Go to the next step.

No

If the ATF color milky or reddish brown, repair or replace AT, then go to Step 7.

5

INSPECT ATF LEVEL

Yes

Go to the next step.

No

Add ATF to the specified level, then go to Step 7.

(See AUTOMATIC TRANSMISSION FLUID (ATF) LEVEL ADJUSTMENT [SJ6A-EL].)

6

INSPECT LINE PRESSURE

  • Are the line pressures within the specifications?

Yes

Go to the next step.

No

7

VERIFY TROUBLESHOOTING OF DTC P0781 COMPLETED
  • Make sure to reconnect all disconnected connectors.

  • Clear the DTC from the TCM memory using the M-MDS.

  • Start the engine.

  • Warm up AT.

  • Drive the vehicle in D range and make sure that the gears shift smoothly from 1GR to 6GR.

  • Is PENDING CODE for this the DTC present?

Yes

Replace the TCM, then go to the next step.

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

No

Go to the next step.

8

VERIFY AFTER REPAIR PROCEDURE
  • Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [SJ6A-EL].)

No

DTC troubleshooting completed.




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