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2008 - MX-5 - Transmission/Transaxle

DTC P0722 [SJ6A-EL]



DTC P0722

Vehicle speed sensor (VSS) circuit malfunction (open circuit/short circuit)

DETECTION CONDITION

  • When all conditions below are satisfied.

    • D range of TR switch input

    • Turbine speed signal 12 pulse input

    • VSS signal not input

    Diagnostic support note:
  • The MIL illuminates 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

  • VSS malfunction

  • Open circuit between VSS terminal B and TCM terminal 2D

  • Open circuit between VSS terminal A and TCM terminal 2C

  • Short to ground in wiring harness between VSS terminal B and TCM terminal 2D

  • Short to ground in wiring harness between VSS terminal A and TCM terminal 2C

  • Short to power in wiring harness between VSS terminal B and TCM terminal 2D

  • Short to power in wiring harness between VSS terminal A and TCM terminal 2C

  • Damaged connector between VSS 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 terminals 2D and 2C (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 13.

4

INSPECT CONTINUITY OF VSS CIRCUIT
  • Inspect for continuity between the couple component terminals 2D and 2C (wiring harness-side).

  • Is there continuity?

Yes

Go to the next step.

No

Go to Step 7.

5

INSPECT VSS SIGNAL CIRCUIT FOR SHORT TO GROUND
  • Inspect for continuity between the TCM terminals (wiring harness-side) and body ground.

    • Terminal 2D and body ground

    • Terminal 2C and body ground

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness for short to ground, then go to Step 10.

6

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

  • Measure the voltage at TCM (wiring harness-side) terminals 2D and 2C.

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

Yes

Go to the next step.

No

Repair or replace the wiring harness for short to power supply, then go to Step 10.

7

INSPECT TERMINAL VSS FOR POOR CONNECTION
  • Turn the ignition switch to the LOCK position.

  • Disconnect the VSS connector.

  • Inspect for poor connection at VSS terminals A and B (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 10.

8

INSPECT VSS

Yes

Go to the next step.

No

Replace the VSS, then go to Step 10.

(See VEHICLE SPEED SENSOR (VSS) REMOVAL/INSTALLATION [SJ6A-EL].)

9

INSPECT VSS CIRCUIT FOR OPEN CIRCUIT

  • Inspect for continuity between VSS terminals (wiring harness-side) and TCM terminals (wiring harness-side).

    • Terminal B and terminal 2D

    • Terminal A and terminal 2C

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness for open circuit, then go to the next step.

10

VERIFY TROUBLESHOOTING OF DTC P0722 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.

11

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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