DTC U3004:11 [START STOP UNIT]

id0902p6025000

Description

ACC relay circuit malfunction

Detection condition

•  Start stop unit detects that the ACC relay output monitor voltage of less than specification for 0.05 s or more with the ignition switched to ACC or ON (engine off or on).

Fail-safe function

Not applicable

Possible cause

•  ACC relay malfunction

•  Start stop unit connector or terminal malfunction

•  Short to ground in wiring harness between ACC relay terminal A and start stop unit terminal 2C

•  Start stop unit malfunction

Description	ACC relay circuit malfunction
Detection condition	• Start stop unit detects that the ACC relay output monitor voltage of less than specification for 0.05 s or more with the ignition switched to ACC or ON (engine off or on).
Fail-safe function	Not applicable
Possible cause	• ACC relay malfunction • Start stop unit connector or terminal malfunction • Short to ground in wiring harness between ACC relay terminal A and start stop unit terminal 2C • Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT ACC RELAY • 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].) • 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 FOR SHORT TO GROUND IN ACC RELAY CIRCUIT • Verify that the ACC relay is removed. • Verify that the start stop unit connector is disconnected. • Inspect for continuity between ACC relay terminal A (wiring harness-side) and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between ACC relay terminal A and start stop unit terminal 2C. 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 a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to the next step.
3		No	Go to the next step.
4	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 to ACC or ON (engine off or on) and wait 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.
4		No	Go to the next step.
5	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].)
5		No	DTC troubleshooting completed.