Diagnostic Procedure

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

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] .) 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 6.
2	INSPECT STARTER INTERLOCK SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT Verify that the start stop unit and starter interlock switch connectors are disconnected. Inspect for continuity between starter interlock switch terminal B (vehicle wiring harness side) and body ground. Is there continuity?	Yes	Go to the next step.
2		No	Repair or replace the wiring harness which has an open circuit, then go to Step 6.
3	INSPECT STARTER INTERLOCK SWITCH Inspect the starter interlock switch. (See STARTER INTERLOCK SWITCH INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Is the starter interlock switch normal?	Yes	Go to the next step.
3		No	Replace the starter interlock switch, then go to Step 6. (See STARTER INTERLOCK SWITCH REMOVAL/INSTALLATION [C66M-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 6.
5	INSPECT STARTER INTERLOCK SWITCH CIRCUIT FOR OPEN CIRCUIT Verify that the start stop unit and starter interlock switch connectors are disconnected. Inspect the wiring harness for continuity between start stop unit terminal 1F (vehicle wiring harness side) and starter interlock switch terminal A (vehicle wiring harness side). Is there continuity?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness which has an open circuit, then go to the next step.
6	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] .) 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 the clutch pedal for 1 s or more and releasing it for 1 s or more for 5 or more times. Perform the DTC inspection for the start stop unit using the M-MDS. (See DTC INSPECTION [START STOP UNIT] .) Is DTC P1708:24 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 .)
6		No	Go to the next step.
7	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] .)
7		No	DTC troubleshooting completed.