DTC P1708:29 [START STOP UNIT]

id0902p6023600

System malfunction location

Starter interlock switch circuit or clutch pedal position switch circuit malfunction

Detection condition

•  The start stop unit detects that the start interlock switch circuit is stuck on for 0.2 s or more, or the clutch pedal position switch circuit is stuck off for 0.25 s or more.

Fail-safe

•  Change to the back-up mode.

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

•  Clutch pedal position switch connector or terminal malfunction

•  Open circuit in wiring harness between clutch pedal position switch terminal B and body ground

•  CPP switch malfunction

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

•  Start stop unit malfunction

System malfunction location	Starter interlock switch circuit or clutch pedal position switch circuit malfunction
Detection condition	• The start stop unit detects that the start interlock switch circuit is stuck on for 0.2 s or more, or the clutch pedal position switch circuit is stuck off for 0.25 s or more.
Fail-safe	• Change to the back-up mode.
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 • Clutch pedal position switch connector or terminal malfunction • Open circuit in wiring harness between clutch pedal position switch terminal B and body ground • CPP switch malfunction • Open circuit in wiring harness between start stop unit terminal 2E and clutch pedal position switch terminal A • Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	STARTER INTERLOCK SWITCH CONNECTOR INSPECTION • Switch the ignition to off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • 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.
1		No	Repair or replace the connector, then go to Step 9.
2	INSPECT STARTER INTERLOCK SWITCH • Inspect the starter interlock switch. (See STARTER INTERLOCK SWITCH INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See STARTER INTERLOCK SWITCH INSPECTION [SKYACTIV-D 2.2].) • Is the starter interlock switch normal?	Yes	Go to the next step.
2		No	Replace the starter interlock switch, then go to Step 9. (See STARTER INTERLOCK SWITCH REMOVAL/INSTALLATION [C66M-R, C66MX-R].) (See STARTER INTERLOCK SWITCH REMOVAL/INSTALLATION [D66M-R, D66MX-R].)
3	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.
3		No	Repair or replace the connector, then go to Step 9.
4	INSPECT STARTER INTERLOCK SWITCH CIRCUIT FOR SHORT TO GROUND • Verify that the start stop unit and starter interlock switch connectors are disconnected. • Inspect for continuity between starter interlock switch terminal A (vehicle wiring harness side) and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness which is shorted to ground, then go to Step 9.
4		No	Go to the next step.
5	INSPECT CPP SWITCH CONNECTOR CONDITION • 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.
5		No	Repair or replace the connector, then go to Step 9.
6	INSPECT CPP SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT • Verify that the CPP switch connector is disconnected. • Inspect for continuity between CPP switch terminal B (vehicle wiring harness side) and body ground. • Is there continuity?	Yes	Go to the next step.
6		No	Repair or replace the wiring harness which has an open circuit, then go to Step 9.
7	INSPECT CPP SWITCH • Inspect the CPP switch. (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [SKYACTIV-D 2.2].) • Is the clutch pedal position switch normal?	Yes	Go to the next step.
7		No	Replace the clutch pedal position switch, then go to the Step 9. (See CLUTCH PEDAL POSITION SWITCH REMOVAL/INSTALLATION [C66M-R, C66MX-R].) (See CLUTCH PEDAL POSITION SWITCH REMOVAL/INSTALLATION [D66M-R, D66MX-R].)
8	INSPECT CPP SWITCH CIRCUIT FOR OPEN CIRCUIT • Verify that the start stop unit and clutch pedal position switch connectors are disconnected. • Inspect the wiring harness for an open circuit between start stop unit terminal 2E (vehicle wiring harness side) and clutch pedal position switch terminal A (vehicle wiring harness side). • Is there continuity?	Yes	Go to the next step.
8		No	Repair or replace the wiring harness which has an open circuit, then go to the next step.
9	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors. • Reconnect the disconnected negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Clear 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. • Perform the DTC inspection for the start stop unit using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is DTC P1708:29 displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the start stop unit, then go to the next step. (See START STOP UNIT REMOVAL/INSTALLATION.)
9		No	Go to the next step.
10	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [START STOP UNIT].)
10		No	DTC troubleshooting completed.