Description

Starter interlock switch circuit or CPP switch circuit malfunction

Detection condition

• Start stop unit detects that the starter interlock switch circuit is stuck on for 0.2 s or more, or the CPP switch circuit is stuck off for 0.25 s or more.

Fail-safe function

• Change to the back-up mode.

• Perform the control with starter interlock switch turned off. (Starter interlock switch circuit malfunction)

Possible cause

• Starter interlock switch connector or terminal malfunction

• Starter interlock switch malfunction

• Start stop unit connector or terminal malfunction

• Short to ground in wiring harness between start stop unit terminal 1F and starter interlock switch terminal A

• CPP switch connector or terminal malfunction

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

• CPP switch malfunction

• Open circuit in wiring harness between start stop unit terminal 2E and CPP switch terminal A

• Start stop unit malfunction

Step

Inspection

Action

1

• Display the following PIDs using the M-MDS.

  (See PID/DATA MONITOR INSPECTION [START STOP UNIT].)

• CLUT_CUT_SW (Starter interlock switch)

• CLUTCH_SW (CPP switch)

• Are all PID values normal?

  (See PID/DATA MONITOR TABLE [START STOP UNIT].)

Yes

Go to Step 12.

No

If the PID CLUT_CUT_SW value is not normal:

• Go to the next step.

If the PID CLUTCH_SW value is not normal:

• Go to Step 6.

If all PID values are not normal:

• Go to Step 11.

2

• 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 12.

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 12.

(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 12.

5

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

• Inspect for continuity between starter interlock switch terminal A (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 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 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 12.

No

Go to Step 12.

6

• Switch the ignition off.

• Disconnect the negative battery cable.

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

• Disconnect the CPP 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 12.

7

• Verify that the CPP switch connector is disconnected.

• Inspect for continuity between CPP 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 CPP 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 12.

8

• Inspect the CPP switch.

  (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [SKYACTIV-G 2.5].)

• Is the CPP switch normal?

Yes

Go to the next step.

No

Replace the CPP switch, then go to the Step 12.

(See CLUTCH PEDAL POSITION SWITCH REMOVAL/INSTALLATION [C66M-R].)

9

• 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 12.

10

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

• Inspect for continuity between start stop unit terminal 2E (wiring harness-side) and CPP switch terminal A (wiring harness-side).

• Is there continuity?

Yes

Go to Step 12.

No

Refer to the wiring diagram and verify whether or not there is a common connector between start stop unit terminal 2E and CPP 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 Step 12.

11

• Switch the ignition off.

• Disconnect the negative battery cable.

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

• 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 the next step.

12

• 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 work of depressing and releasing the clutch pedal 3 times.

• 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.

13

• 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.