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2008 - MX-5 - Transmission/Transaxle

DTC P0819 [SJ6A-EL]



DTC P0819

Manual switch/up switch/down switch circuit malfunction (open circuit/short circuit)

DETECTION CONDITION

    M range switch circuit malfunction
  • M range switch remains on for 2 s or more except in D range.

    Up switch or down switch circuit malfunction
  • When all of the following conditions are met:

    • M range switch off.

    • Except D range

    • Up or down switch remains on for 10 s or more.

    Diagnostic support note:
  • The MIL does not illuminate if the TCM detects the above malfunction condition during the 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

  • M range switch malfunction

  • Up switch malfunction

  • Down switch malfunction.

  • Open circuit in wiring harness between selector lever component terminal D and TCM terminal 2J

  • Open circuit in wiring harness between selector lever component terminal F and TCM terminal 2F

  • Open circuit in wiring harness between selector lever component terminal B and TCM terminal 2G

  • Open circuit in wiring harness between selector lever component terminal A and ground

  • Short to ground in wiring harness between selector lever component terminal D and TCM terminal 2J

  • Short to ground in wiring harness between selector lever component terminal F and TCM terminal 2F

  • Short to ground in wiring harness between selector lever component terminal Band TCM terminal 2G

  • Damaged connector between selector lever component 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
  • Disconnect the TCM connector.

  • Inspect for poor connection at TCM terminals 2F, 2G and 2J (such as damaged/pulled-out pins, corrosion).

  • Are terminals normal?

Yes

Go to the next step.

No

Repair or replace the connector and/or terminal, then go to Step 9.

4

INSPECT SELECTOR LEVER COMPONENT CONNECTOR FOR POOR CONNECTION
  • Disconnect the selector lever component connector.

  • Inspect for poor connection at selector lever component terminals A, B, D and F (such as damaged/pulled-out pins, corrosion).

  • Are terminals normal?

Yes

Go to the next step.

No

Repair or replace the connector and/or terminal, then go to Step 9.

5

INSPECT M RANGE SWITCH, UP SWITCH, AND DOWN SWITCH CIRCUIT FOR SHORT TO GROUND
  • Inspect for continuity between selector lever component terminals (wiring harness-side) and body ground.

    • Terminal B and body ground (M range switch)

    • Terminal D and body ground (up switch)

    • Terminal F and body ground (down switch)

  • Is there continuity?

Yes

Repair or replace the harness, then go to Step 9.

No

Go to the next step.

6

INSPECT M RANGE SWITCH, UP SWITCH, AND DOWN SWITCH

Yes

Go to the next step.

No

Replace the selector lever, then go to Step 9.

(See SELECTOR LEVER REMOVAL/INSTALLATION.)

7

INSPECT M RANGE SWITCH, UP SWITCH, AND DOWN SWITCH CIRCUIT FOR OPEN CIRCUIT
  • Inspect for continuity between selector lever component terminal A (wiring harness-side) and body ground.

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace the harness, then go to Step 9.

8

INSPECT M RANGE SWITCH, UP SWITCH, AND DOWN SWITCH CIRCUIT FOR OPEN CIRCUIT
  • Inspect for continuity between TCM terminals (wiring harness-side) and selector lever component terminals (wiring harness-side).

    • Terminal 2G and terminal B (M range switch)

    • Terminal 2J and terminal D (up switch)

    • Terminal 2F and terminal F (down switch)

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace the harness, then go to the next step.

9

VERIFY TROUBLESHOOTING OF DTC P0819 COMPLETED
  • Make sure to reconnect all the disconnected connectors.

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

  • Drive the vehicle in M range, and change gears by shifting the selector lever (operating the up and down switches).

  • 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.

10

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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