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DTC P0722:00 [TCM (SJ6A-EL)]

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2016 – MX-5 – Transmission/Transaxle

DTC P0722:00 [TCM (SJ6A-EL)]

DTC P0722:00

VSS: No signal input

DETECTION CONDITION

  • Vehicle condition: TCM normal during engine rotation

  • Status: VSS signal not input during turbine sensor 12-pulse detection

  • Period: Confirmed 500 times

FAIL-SAFE FUNCTION

  • Substitutes a VSS signal for a signal from the turbine sensor.

  • Inhibits learning control.

  • Inhibits the neutral control.

  • Inhibits the reverse control.

  • Inhibits the slope control.

  • Inhibits slip control.

  • Inhibits the manual shift control.

  • Inhibits manual shifting using the up or down switch of the selector lever.

  • Inhibits AAS mode.

  • Inhibits 5GR and 6GR.

  • Inhibits direct mode.

POSSIBLE CAUSE

  • TCM connector or terminal malfunction

  • VSS connector or terminal malfunction

  • Short to ground in wiring harness between VSS terminal B and TCM terminal 1D

  • Short to ground in wiring harness between VSS terminal A and TCM terminal 1C

  • Short to power supply in wiring harness between VSS terminal B and TCM terminal 1D

  • Short to power supply in wiring harness between VSS terminal A and TCM terminal 1C

  • Open circuit between VSS terminal B and TCM terminal 1D

  • Open circuit between VSS terminal A and TCM terminal 1C

  • VSS malfunction

  • 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 terminals 1D and 1C (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.

4

INSPECT CONTINUITY OF VSS CIRCUIT

  • Inspect for continuity between the coupler component terminals 1D and 1C (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 1D and body ground

    • Terminal 1C and body ground

  • Is there continuity?

Yes

Go to the next step.

No

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

  • VSS terminal B—TCM terminal 1D

  • VSS terminal A—TCM terminal 1C

    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 ground.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

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

Go to Step 10.

6

INSPECT VSS CIRCUIT FOR SHORT TO POWER SUPPLY

  • Switch the ignition ON (engine off).

  • Measure the voltage at TCM (wiring harness-side) terminals 1D and 1C.

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

Yes

Go to the next step.

No

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

  • VSS terminal B—TCM terminal 1D

  • VSS terminal A—TCM terminal 1C

    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 Step 10.

7

INSPECT TERMINAL VSS FOR POOR CONNECTION

  • Switch the ignition off.

  • 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 1D

    • Terminal A and terminal 1C

  • Is there continuity?

Yes

Go to the next step.

No

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

  • VSS terminal B—TCM terminal 1D

  • VSS terminal A—TCM terminal 1C

    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 an open circuit.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

Go to the next step.

10

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.

11

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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