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

Diagnostic Procedure

Step

Inspection

Action

1
VERIFY PCM DTCs
•  Perform the DTC inspection for the PCM using the M-MDS.
•  Is the DTC displayed?
Yes
Repair the malfunctioning part according to the applicable DTC troubleshooting.
No
Go to the next step.
2
INSPECT STARTER RELAY FOR MALFUNCTION
•  Switch the ignition to off.
•  Remove the starter relay.
•  Inspect the starter relay.
•  Is the starter relay normal?
Yes
Go to the next step.
No
Replace the starter relay, then go to Step 7.
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.
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.
•  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.
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 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.
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.
No
Go to the next step.
7
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Reconnect all the disconnected connectors.
•  Clear DTC for the start stop unit using the M-MDS.
•  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.
•  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.
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.
No
DTC troubleshooting completed.