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2008 - MX-5 - Transmission/Transaxle

DTC P0986 [SJ6A-EL]



DTC P0986

Shift solenoid E circuit malfunction (short to power/open circuit)

DETECTION CONDITION

  • Open or short circuit in shift solenoid E signal system (while TCM monitors solenoid output voltage, the voltage that differs from the signal output by CPU in TCM is detected).

    Diagnostic support note:
  • The MIL illuminates if the TCM detects the above malfunction condition during first drive cycle.

  • A PENDING CODE is not available.

  • FREEZE FRAME DATA is available.

  • The AT warning light illuminates.

  • The DTC is stored in the TCM memory.

POSSIBLE CAUSE

  • Open circuit in wiring harness between shift solenoid E terminal A and TCM terminal 1V

  • Short to power in wiring harness between shift solenoid E terminal A and TCM terminal 1V

  • Shift solenoid E malfunction

  • Damaged connector between shift solenoid E and TCM

  • TCM malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
  • Has the 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 TCM CONNECTOR FOR POOR CONNECTION
  • Turn the ignition switch to the LOCK position.

  • Disconnect the TCM connector.

  • Inspect for poor connection at TCM terminal 1V (such as damaged/pulled-out pins, corrosion).

  • Is terminal normal?

Yes

Go to the next step.

No

Repair or replace the connector and/or terminal, then go to Step 11.

4

INSPECT RESISTANCE OF SHIFT SOLENOID E CIRCUIT

Yes

Go to Step 9.

No

Go to the next step.

5

INSPECT COUPLE COMPONENT CONNECTOR FOR POOR CONNECTION
  • Turn the ignition switch to the LOCK position.

  • Disconnect the couple component connector.

  • Inspect for poor connection at couple component terminal K (such as damaged/pulled-out pins, corrosion).

  • Is terminal normal?

Yes

Go to the next step.

No

Repair or replace the connector and/or terminal, then go to Step 11.

6

INSPECT RESISTANCE OF SHIFT SOLENOID E CIRCUIT
  • Inspect the resistance between couple component (transmission case side) terminal K and body ground.

  • Is the resistance within 5.0—5.6 ohms?

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

Yes

Go to Step 11.

No

Go to the next step.

7

INSPECT SHIFT SOLENOID E CONNECTOR FOR POOR CONNECTION
  • Turn the ignition switch to the LOCK position.

  • Disconnect the shift solenoid E connector.

  • Inspect for poor connection at shift solenoid E terminal A (such as damaged/pulled-out pins, corrosion).

  • Is terminal normal?

Yes

Go to the next step.

No

Repair or replace the connector and/or terminal, then go to Step 11.

8

INSPECT SHIFT SOLENOID E

Yes

Repair or replace the wiring harness (couple component—shift solenoid E) for short to ground, then go to Step 11.

No

Replace the control valve body, then go to Step 11.

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

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

9

INSPECT SHIFT SOLENOID E CIRCUIT FOR SHORT TO POWER SUPPLY
  • Turn the ignition switch to the ON position (engine off).

  • Measure the voltage at TCM (wiring harness-side) terminal 1V.

  • Is there 0 V at the TCM wiring harness-side connector terminals?

Yes

Go to Step 11.

No

Go to the next step.

10

INSPECT SHIFT SOLENOID E CIRCUIT FOR SHORT TO POWER SUPPLY
  • Turn the ignition switch to the LOCK position.

  • Disconnect the couple component connector.

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

  • Measure the voltage at couple component (wiring harness-side) terminal K.

  • Is there 0 V at the TCM wiring harness-side connector terminals?

Yes

Repair or replace the wiring harness (TCM—couple component) for short to power supply, then go to the next step.

No

Repair or replace the wiring harness (couple component—shift solenoid E) for short to power supply, then go to the next step.

11

VERIFY TROUBLESHOOTING OF DTC P0986 COMPLETED
  • Make sure to reconnect all the disconnected connectors.

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

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

  • Is same DTC present?

Yes

Replace the TCM, then go to the next step.

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

No

Go to the next step.

12

VERIFY AFTER REPAIR PROCEDURE
  • Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [SJ6A-EL].)

No

Troubleshooting completed.




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