DTC U3003:16 [START STOP UNIT]

id0902p6024900

Description

Start stop unit power supply voltage (terminal 1A) low input
Detection condition
•  Start stop unit power supply circuit voltage (terminal 1A) of 5V or more, less than 8.5 V is detected for 5 s or more.
Fail-safe
•  The door lock and unlock may not operate using the advanced keyless entry system. (With advanced keyless entry system)
•  The door lock and unlock may not operate using the keyless entry system. (With keyless entry system)
•  When starting the engine, it may be necessary to use the method for starting the engine when the transmitter battery is dead.
Possible cause
•  DTCs are stored in the PCM.
•  Battery malfunction
•  Generator malfunction
•  Start stop unit connector or terminal malfunction
•  Malfunction between battery positive terminal and start stop unit terminal 1A
•  Start stop unit malfunction

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY PCM DTCs
•  Retrieve the PCM DTCs using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-G 2.5T)].)
No
Go to the next step.
2
INSPECT BATTERY
•  Inspect the battery.
•  Is the battery normal?
Yes
Go to the next step.
No
Recharge or replace the battery, then go to Step 6.
(See BATTERY RECHARGING.)
(See BATTERY REMOVAL/INSTALLATION.)
3
INSPECT GENERATOR
•  Inspect the generator.
•  Is the generator normal?
Yes
Go to the next step.
No
Replace the generator, then go to Step 6.
(See GENERATOR REMOVAL/INSTALLATION [WITHOUT i-ELOOP (SKYACTIV-G 2.5T)].)
(See GENERATOR REMOVAL/INSTALLATION [WITH i-ELOOP (SKYACTIV-G 2.5T)].)
4
INSPECT START STOP UNIT CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  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 6.
5
VERIFY START STOP UNIT POWER SUPPLY VOLTAGE (TERMINAL 1A)
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  Display PID VPWR_B1 using the M-MDS.
•  Is the voltage 5 V or more or less than 8.5 V?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and start stop unit terminal 1A.
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 malfunction.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Inspect the wiring harness battery positive terminal and start stop unit terminal 1A.
?  If there is any malfunction:
•  Repair or replace the wiring harness.
?  If there is no malfunction:
•  Replace the start stop unit.
Go to the next step.
No
Go to the next step.
6
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  Clear the DTC for the start stop unit using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 5 s or more.
•  Retrieve the start stop unit DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the start stop unit.
Go to the next step.
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].)
No
DTC troubleshooting completed.