DTC U201F:12 [START STOP UNIT]

id0902p6024400

System malfunction location

Keyless receiver circuit malfunction

Detection condition

•  Start stop unit detects keyless receiver circuit voltage of 6.2 V or more for 0.5 s or more.

Fail-safe

—

Possible cause

•  Keyless receiver connector or terminal malfunction

•  Start stop unit connector or terminal malfunction

•  Short to power supply in wiring harness between start stop unit terminal 2Q and keyless receiver terminal A

•  Keyless receiver malfunction

•  Start stop unit malfunction

System malfunction location	Keyless receiver circuit malfunction
Detection condition	• Start stop unit detects keyless receiver circuit voltage of 6.2 V or more for 0.5 s or more.
Fail-safe	—
Possible cause	• Keyless receiver connector or terminal malfunction • Start stop unit connector or terminal malfunction • Short to power supply in wiring harness between start stop unit terminal 2Q and keyless receiver terminal A • Keyless receiver malfunction • Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT KEYLESS RECEIVER CONNECTOR CONDITION • 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].) • Disconnect the keyless receiver 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.
1		No	Repair or replace the connector, then go to Step 5.
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 5.
3	INSPECT KEYLESS RECEIVER CIRCUIT FOR SHORT TO POWER SUPPLY • Reconnect the start stop unit connector. • Verify that the keyless receiver connector is disconnected. • Connect 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].) • Switch the ignition ON (engine off or on). • Measure the voltage at the following terminals (vehicle wiring harness side). ― Keyless receiver terminal A ― Start stop unit terminal 2Q • Is the voltage 0 V?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness which is shorted to power supply, then go to Step 5.
4	INSPECT KEYLESS RECEIVER • Inspect the keyless receiver. (See KEYLESS RECEIVER INSPECTION.) • Is the keyless receiver normal?	Yes	Go to the next step.
4		No	Replace the keyless receiver, then go to the next step. (See KEYLESS RECEIVER REMOVAL/INSTALLATION.)
5	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 ON (engine off or on) and wait for 0.5 s or more. • Perform the DTC inspection for the start stop unit using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is DTC U201F:12 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.)
5		No	Go to the next step.
6	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].)
6		No	DTC troubleshooting completed.