DTC P1708:29 [START STOP UNIT]

id0902p6023600

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

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

Diagnostic Procedure

Step	Inspection		Action
1	PERFORM PID/DATA MONITOR INSPECTION AND DETERMINE MALFUNCTIONING LOCATION • 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.
1		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	INSPECT STARTER INTERLOCK SWITCH CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • 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.
2		No	Repair or replace the connector, then go to Step 12.
3	INSPECT STARTER INTERLOCK SWITCH • Inspect the starter interlock switch. (See STARTER INTERLOCK SWITCH INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See STARTER INTERLOCK SWITCH INSPECTION [SKYACTIV-D 1.5].) (See STARTER INTERLOCK SWITCH INSPECTION [SKYACTIV-D 2.2].) (See STARTER INTERLOCK SWITCH INSPECTION [MZR 1.6].) • Is the starter interlock switch normal?	Yes	Go to the next step.
3		No	Replace the starter interlock switch, then go to Step 12. (See STARTER INTERLOCK SWITCH REMOVAL/INSTALLATION [C66M-R].) (See STARTER INTERLOCK SWITCH REMOVAL/INSTALLATION [D66M-R].) (See STARTER INTERLOCK SWITCH REMOVAL/INSTALLATION [F66M-R].) (See STARTER INTERLOCK SWITCH REMOVAL/INSTALLATION [F35M-R].)
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.
4		No	Repair or replace the connector, then go to Step 12.
5	INSPECT FOR SHORT TO GROUND IN STARTER INTERLOCK SWITCH CIRCUIT • 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.
5		No	Go to Step 12.
6	INSPECT CPP SWITCH CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • 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.
6		No	Repair or replace the connector, then go to Step 12.
7	INSPECT FOR OPEN CIRCUIT IN CPP SWITCH GROUND CIRCUIT • 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.
7		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 CPP SWITCH • Inspect the CPP switch. (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [SKYACTIV-D 1.5].) (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [SKYACTIV-D 2.2].) (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [MZR 1.6].) • Is the CPP switch normal?	Yes	Go to the next step.
8		No	Replace the CPP switch, then go to the Step 12. (See CLUTCH PEDAL POSITION SWITCH REMOVAL/INSTALLATION [C66M-R].) (See CLUTCH PEDAL POSITION SWITCH REMOVAL/INSTALLATION [D66M-R].) (See CLUTCH PEDAL POSITION SWITCH REMOVAL/INSTALLATION [F66M-R].) (See CLUTCH PEDAL POSITION SWITCH REMOVAL/INSTALLATION [F35M-R].)
9	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.
9		No	Repair or replace the connector, then go to Step 12.
10	INSPECT FOR OPEN CIRCUIT IN CPP SWITCH CIRCUIT • 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.
10		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	INSPECT START STOP UNIT CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • 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.
11		No	Repair or replace the connector, then go to the next step.
12	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • 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.
12		No	Go to the next step.
13	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].)
13		No	DTC troubleshooting completed.