DTC U3004:17 [START STOP UNIT]

id0902p6025300

System malfunction location

ACC relay circuit malfunction

Detection condition

•  The start stop unit detects ACC monitor voltage of 2.5 V or more for 5 s or more with the ignition switched off.

Fail-safe

•  Door locking operation inhibited while under i-stop control.

Possible cause

•  ACC relay malfunction

•  Start stop unit connector or terminal malfunction

•  Short to power supply in wiring harness between ACC relay terminal D and start stop unit terminal 1E

•  Start stop unit malfunction

System malfunction location	ACC relay circuit malfunction
Detection condition	• The start stop unit detects ACC monitor voltage of 2.5 V or more for 5 s or more with the ignition switched off.
Fail-safe	• Door locking operation inhibited while under i-stop control.
Possible cause	• ACC relay malfunction • Start stop unit connector or terminal malfunction • Short to power supply in wiring harness between ACC relay terminal D and start stop unit terminal 1E • Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT ACC 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 ACC relay. (See RELAY LOCATION.) • Inspect the ACC relay. (See RELAY INSPECTION.) • Is the ACC relay normal?	Yes	Go to the next step.
1		No	Replace the ACC relay, then go to Step 4. (See RELAY LOCATION.)
2	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.
2		No	Repair or replace the connector, then go to Step 4.
3	INSPECT START STOP UNIT POWER SUPPLY CIRCUIT (ACC) FOR SHORT TO POWER SUPPLY • 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].) • Measure the voltage at start stop unit terminal 1E (vehicle wiring harness side). • Is the voltage 2.5 V or more?	Yes	Repair or replace the wiring harness which has a short to the power supply, then go to the next step.
3		No	Go to the next step.
4	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 5 s or more. • Perform the DTC inspection for the start stop unit using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is the DTC U3004:17 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.)
4		No	Go to the next step.
5	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].)
5		No	DTC troubleshooting completed.