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DTC P0986:00 [TCM (SJ6A-EL)]

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2016 – MX-5 – Transmission/Transaxle

DTC P0986:00 [TCM (SJ6A-EL)]

DTC P0986:00

Shift solenoid E signal: Open/short circuit

DETECTION CONDITION

  • Vehicle condition: Shift solenoid E OFF signal is output while TCM is normal with engine running

  • Status: Detects open circuit or short to power supply in shift solenoid E signal system

  • Period: Confirmed 1 time in 0.5 s or more

FAIL-SAFE FUNCTION

  • Inhibits learning control.

  • Inhibits the manual shift control.

  • Inhibits direct mode.

  • Inhibits AAS mode.

  • Inhibits the TCC control and slip control.

  • Inhibits 5GR and 6GR.

  • Inhibits the neutral control.

  • Sets to emergency mode.

POSSIBLE CAUSE

  • TCM connector or terminal malfunction

  • Coupler component connector or terminal malfunction

  • Shift solenoid E connector or terminal malfunction

  • Short to ground in wiring harness between shift solenoid E terminal A and TCM terminal 2V

  • Shift solenoid E malfunction

  • Short to power supply in wiring harness between shift solenoid E terminal A and TCM terminal 2V

  • TCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

NOTE:

  • Recording can be facilitated using the screen capture of the PC function.

  • Record the freeze frame data/snap shot data.

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

  • Switch the ignition off.

  • Disconnect the TCM connector.

  • Inspect for poor connection at TCM terminal 2V (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 COUPLER COMPONENT CONNECTOR FOR POOR CONNECTION

  • Switch the ignition off.

  • Disconnect the coupler component connector.

  • Inspect for poor connection at coupler 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 coupler component (transmission case side) terminal K and body ground.

  • Is the resistance within 11—15 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

  • Switch the ignition off.

  • 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 (coupler 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

  • Switch the ignition ON (engine off).

  • Measure the voltage at TCM (wiring harness-side) terminal 2V.

  • 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

  • Switch the ignition off.

  • Disconnect the coupler component connector.

  • Switch the ignition ON (engine off).

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

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

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

  • TCM terminal 2V—Coupler component terminal K

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to power supply.

Go to the next step.

No

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

11

VERIFY SAME DTC IS NOT 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 DTC TROUBLESHOOTING COMPLETED

Yes

Go to the applicable DTC inspection.

(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (SJ6A-EL)].)

No

DTC troubleshooting completed.

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