DTC P0615:12 [START STOP UNIT]

id0902p6022100

System malfunction location

Starter relay circuit malfunction

Detection condition

•  The start stop unit detects starter relay circuit voltage of specification or more for 1 s or more with the ignition switched off.

Fail-safe

•  Inhibits switching the ignition ON.

•  Inhibits the engine start.

Possible cause

•  DTCs are stored in the PCM

•  Starter relay malfunction

•  Start stop unit connector or terminal malfunction

•  Short to power supply in wiring harness between the following terminals:

―  Starter relay terminal A—Start stop unit terminal 2V

―  Starter relay terminal E—Start stop unit terminal 1D

•  PCM connector malfunction

•  Short to ground in wiring harness between the following terminals:

―  Start stop unit terminal 1D—PCM terminal 2AZ (SKYACTIV-G 2.0, SKYACTIV-G 2.5)

―  Start stop unit terminal 1D—PCM terminal 2BF (SKYACTIV-G 2.2)

•  Start stop unit malfunction

System malfunction location	Starter relay circuit malfunction
Detection condition	• The start stop unit detects starter relay circuit voltage of specification or more for 1 s or more with the ignition switched off.
Fail-safe	• Inhibits switching the ignition ON. • Inhibits the engine start.
Possible cause	• DTCs are stored in the PCM • Starter relay malfunction • Start stop unit connector or terminal malfunction • Short to power supply in wiring harness between the following terminals: ― Starter relay terminal A—Start stop unit terminal 2V ― Starter relay terminal E—Start stop unit terminal 1D • PCM connector malfunction • Short to ground in wiring harness between the following terminals: ― Start stop unit terminal 1D—PCM terminal 2AZ (SKYACTIV-G 2.0, SKYACTIV-G 2.5) ― Start stop unit terminal 1D—PCM terminal 2BF (SKYACTIV-G 2.2) • Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY PCM DTCs • Perform the DTC inspection for the PCM using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) • Is the DTC displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DTC TABLE [SKYACTIV-D 2.2].)
1		No	Go to the next step.
2	INSPECT STARTER RELAY FOR MALFUNCTION • 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].) • Remove the starter relay. (See RELAY LOCATION.) • Inspect the starter relay. (See RELAY INSPECTION.) • Is the starter relay normal?	Yes	Go to the next step.
2		No	Replace the starter relay, then go to Step 7. (See RELAY LOCATION.)
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 7.
4	INSPECT STARTER RELAY CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the starter relay is removed. • Verify that the start stop unit connector is disconnected. • Connect 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].) • Measure the voltage at the following terminals (vehicle wiring harness side). ― Starter relay terminal A ― Starter relay terminal E • Is the voltage 0 V?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness which has a short to the power supply, then go to Step 7.
5	INSPECT PCM CONNECTOR CONDITION • 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 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.
5		No	Repair or replace the connector, then go to Step 7.
6	INSPECT STARTER RELAY CIRCUIT FOR SHORT TO GROUND • Verify that the starter relay is removed. • Verify that the start stop unit and PCM connectors are disconnected. • Inspect for continuity the wiring harness between start stop unit terminal 1D (vehicle wiring harness side) and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness which has a short to ground, then go to the next step.
6		No	Go to the next step.
7	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 to off and wait for 1 s or more. • Perform the DTC inspection for the start stop unit using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is DTC P0615:12 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.)
7		No	Go to the next step.
8	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].)
8		No	DTC troubleshooting completed.