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DTC P0930:71 [START STOP UNIT]

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2016 – MX-5 – Body and Accessories

DTC P0930:71 [START STOP UNIT]

Description

Shift-lock solenoid circuit malfunction

Detection condition

  • The start stop unit continues to operate the shift-lock solenoid for 30 min or more with the ignition switched ON (engine off or on).

Fail-safe

  • Inhibits the shift lock control.

Possible cause

  • DTCs are stored in the TCM.

    • Transaxle range switch circuit malfunction

  • Brake switch connector or terminal malfunction

  • Brake switch (No.1 signal) malfunction

  • Start stop unit connector or terminal malfunction

  • Short to ground in wiring harness between brake switch terminal D and start stop unit terminal 1C

  • Start stop unit malfunction

Diagnostic Procedure

Step

Inspection

Action

1

VERIFY TCM DTCs

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

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

No

Go to the next step.

2

INSPECT BRAKE SWITCH CONNECTOR CONDITION

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the brake switch connector.

  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.

  • Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

3

INSPECT BRAKE SWITCH (No.1 SIGNAL)

Yes

Go to the next step.

No

Replace the brake switch, then go to Step 6.

(See BRAKE PEDAL REMOVAL/INSTALLATION.)

4

INSPECT START STOP UNIT CONNECTOR CONDITION

  • Disconnect the start stop unit connector.

  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.

  • Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

5

INSPECT BRAKE SWITCH (No.1 SIGNAL) CIRCUIT FOR SHORT TO GROUND

  • Verify that the brake switch and start stop unit connectors are disconnected.

  • Inspect for continuity between brake switch terminal D (wiring harness-side) and body ground.

  • Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between brake switch terminal D and start stop unit 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 the next step.

No

Go to the next step.

6

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

7

VERIFY IF OTHER DTCs DISPLAYED

  • Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [START STOP UNIT].)

No

DTC troubleshooting completed.

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