Description

Starter interlock switch circuit malfunction

Detection condition

• Start stop unit detects an open circuit in the starter interlock switch circuit for 0.5 s or more for a continuous 5 times with the ignition switched ON (engine off or on).

Fail-safe function

• Change to the back-up mode.

Possible cause

• Starter interlock switch connector or terminal malfunction

• Open circuit in wiring harness between starter interlock switch terminal B and body ground

• Starter interlock switch malfunction

• Start stop unit connector or terminal malfunction

• Open circuit in wiring harness between start stop unit terminal 1F and starter interlock switch terminal A

• Start stop unit malfunction

Step

Inspection

Action

1

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Disconnect the starter interlock 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.

2

• Verify that the starter interlock switch connector is disconnected.

• Inspect for continuity between starter interlock switch terminal B (wiring harness-side) 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 starter interlock switch terminal B and body ground.

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 Step 6.

3

• Inspect the starter interlock switch.

  (See STARTER INTERLOCK SWITCH INSPECTION [SKYACTIV-G 2.5].)

• Is the starter interlock switch normal?

Yes

Go to the next step.

No

Replace the starter interlock switch, then go to Step 6.

(See STARTER INTERLOCK SWITCH REMOVAL/INSTALLATION [C66M-R].)

4

• 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

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

• Inspect for continuity between start stop unit terminal 1F (wiring harness-side) and starter interlock switch terminal A (wiring harness-side).

• 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 start stop unit terminal 1F and starter interlock switch terminal A.

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.

6

• Always reconnect all disconnected connectors.

• Reconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Clear the DTC for the start stop unit using the M-MDS.

  (See CLEARING DTC [START STOP UNIT].)

• Switch the ignition ON (engine off or on).

• Perform the following work 5 times or more.

• Depress the clutch pedal for 1 s or more.

• Release the clutch pedal for 1 s or more.

• Retrieve the start stop unit DTCs using the M-MDS.

  (See DTC INSPECTION [START STOP UNIT].)

• Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the start stop unit.

  (See START STOP UNIT REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

7

• 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.