DTC P1708:24 [START STOP UNIT]

id0902p6023500

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

•  PCM connector or terminal malfunction

•  Start stop unit connector or terminal malfunction

•  Open circuit in wiring harness between the following terminals:

―  Starter interlock switch terminal A—PCM terminal 2BD (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5)

―  Starter interlock switch terminal A—PCM terminal 2N (SKYACTIV-D 1.5)

―  Starter interlock switch terminal A—PCM terminal 2AI (SKYACTIV-D 2.2)

―  Starter interlock switch terminal A—PCM terminal 1V (MZR 1.6)

―  Starter interlock switch terminal A—Start stop unit terminal 1F

•  PCM malfunction

•  Start stop unit malfunction

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 • PCM connector or terminal malfunction • Start stop unit connector or terminal malfunction • Open circuit in wiring harness between the following terminals: ― Starter interlock switch terminal A—PCM terminal 2BD (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5) ― Starter interlock switch terminal A—PCM terminal 2N (SKYACTIV-D 1.5) ― Starter interlock switch terminal A—PCM terminal 2AI (SKYACTIV-D 2.2) ― Starter interlock switch terminal A—PCM terminal 1V (MZR 1.6) ― Starter interlock switch terminal A—Start stop unit terminal 1F • PCM malfunction • Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	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.
1		No	Repair or replace the connector, then go to Step 8.
2	INSPECT FOR OPEN CIRCUIT IN STARTER INTERLOCK SWITCH GROUND CIRCUIT • 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.
2		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 8.
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 8. (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 PCM CONNECTOR CONDITION • Disconnect the PCM 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 8.
5	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.
5		No	Repair or replace the connector, then go to Step 8.
6	INSPECT FOR OPEN CIRCUIT IN STARTER INTERLOCK SWITCH CIRCUIT • Verify that the start stop unit, PCM and starter interlock switch connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― Starter interlock switch terminal A—PCM terminal 2BD (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5) ― Starter interlock switch terminal A—PCM terminal 2N (SKYACTIV-D 1.5) ― Starter interlock switch terminal A—PCM terminal 2AI (SKYACTIV-D 2.2) ― Starter interlock switch terminal A—PCM terminal 1V (MZR 1.6) ― Starter interlock switch terminal A—Start stop unit terminal 1F • Is there continuity?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Starter interlock switch terminal A—PCM terminal 2BD (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5) • Starter interlock switch terminal A—PCM terminal 2N (SKYACTIV-D 1.5) • Starter interlock switch terminal A—PCM terminal 2AI (SKYACTIV-D 2.2) • Starter interlock switch terminal A—PCM terminal 1V (MZR 1.6) • Starter interlock switch terminal A—Start stop unit terminal 1F 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 8.
7	PERFORM DTC INSPECTION AND VERIFY PCM MALFUNCTION • 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 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	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) (See PCM REMOVAL/INSTALLATION [MZR 1.6].)
7		No	Go to Step 9.
8	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 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.
8		No	Go to the next step.
9	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].)
9		No	DTC troubleshooting completed.