DTC U201F:12 [START STOP UNIT]

id0902p6024400

Description

Keyless receiver circuit malfunction
Detection condition
•  Start stop unit detects that the keyless receiver circuit voltage of 6.2 V or more for 0.5 s or more.
Fail-safe function
Not applicable
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 off.
•  Disconnect the negative battery cable.
•  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.
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.
No
Repair or replace the connector, then go to Step 5.
3
INSPECT FOR SHORT TO POWER SUPPLY IN KEYLESS RECEIVER CIRCUIT
•  Reconnect the start stop unit connector.
•  Verify that the keyless receiver connector is disconnected.
•  Reconnect the negative battery cable.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Keyless receiver terminal A
―  Start stop unit terminal 2Q
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between start stop unit terminal 2Q and keyless receiver terminal A.
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 Step 5.
4
INSPECT KEYLESS RECEIVER
•  Inspect the keyless receiver.
•  Is the keyless receiver normal?
Yes
Go to the next step.
No
Replace the keyless receiver, then go to the next step.
(See KEYLESS RECEIVER REMOVAL/INSTALLATION.)
5
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the start stop unit using the M-MDS.
•  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.
6
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.