DTC U3004:17 [START STOP UNIT]

id0902p6025300

Description

ACC relay circuit malfunction

Detection condition

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

Fail-safe function

•  Door locking operation inhibited while under i-stop control. (With i-stop system)

Possible cause

•  Malfunction in accessory part installed to accessory socket

•  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

Description	ACC relay circuit malfunction
Detection condition	• Start stop unit detects that the ACC monitor voltage of 2.5 V or more for 5 s or more with the ignition switched off.
Fail-safe function	• Door locking operation inhibited while under i-stop control. (With i-stop system)
Possible cause	• Malfunction in accessory part installed to accessory socket • 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	VERIFY IF ACCESSORY PART IS INSTALLED TO ACCESSORY SOCKET • Verify if the accessory part is installed to the accessory socket. • Is an accessory part installed to the accessory socket?	Yes	Go to the next step.
1		No	Go to Step 3.
2	VERIFY IF MALFUNCTIONING LOCATION IS ACCESSORY DEPENDING ON REPEATABILITY • 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 accessory part installed to the accessory socket. • 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 off and wait for 5 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	Go to the next step.
2		No	System is normal. (Explain to the customer that the malfunction occurred due to an accessory installed to the vehicle.) Go to Step 7.
3	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.
3		No	Replace the ACC relay, then go to Step 6. (See RELAY LOCATION.)
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 FOR SHORT TO POWER SUPPLY IN ACC RELAY CIRCUIT • 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].) • Measure the voltage at the start stop unit terminal 1E (wiring harness-side). • Is the voltage 2.5 V or more?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between ACC relay terminal D and start stop unit terminal 1E. 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 power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to the next step.
5		No	Go to the next step.
6	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 off and wait for 5 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.
6		No	Go to the next step.
7	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].)
7		No	DTC troubleshooting completed.