ELECTRIC PARKING BRAKE AUTOMATIC RELEASE FUNCTION DURING ACCELERATION OPERATION TOO EARLY/LATE ON SLOPE [ELECTRIC PARKING BRAKE]

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Note

•  If there is any vehicle malfunction complaint lodged by a customer, perform FOREWORD [ELECTRIC PARKING BRAKE] malfunction diagnosis according to the troubleshooting procedure. (See FOREWORD [ELECTRIC PARKING BRAKE].)

Description

Possible Cause

―  SKYACTIV-G 2.0

•  Back-up light switch terminal A—PCM terminal 1L

―  SKYACTIV-D 2.2

•  Back-up light switch terminal A—PCM terminal 1EH

―  SKYACTIV-G 2.0

•  Back-up light switch terminal A—PCM terminal 1L

―  SKYACTIV-D 2.2

•  Back-up light switch terminal A—PCM terminal 1EH

―  SKYACTIV-G 2.0

•  Back-up light switch terminal A—PCM terminal 1L

―  SKYACTIV-D 2.2

•  Back-up light switch terminal A—PCM terminal 1EH

System Wiring Diagram

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Diagnostic Procedure

Step	Inspection		Action
1	VERIFY ALL SYSTEM DTCs •  Switch the ignition off. •  Switch the ignition ON (engine off or on) and wait for 10 s or more. •  Perform a CMDTC self-test using the M-MDS. (See DTC INSPECTION [ELECTRIC PARKING BRAKE].) •  Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [ELECTRIC PARKING BRAKE].)
		No	Go to the next step.
2	VERIFY IF THE ELECTRIC PARKING BRAKE WARNING LIGHT IS TURNED ON •  Verify if the electric parking brake warning light is turned on. •  Is the electric parking brake warning light turned on?	Yes	Perform an inspection referring to “ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON”. (See ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON [ELECTRIC PARKING BRAKE].)
		No	ATX: •  Replace the electric parking brake control module. (See ELECTRIC PARKING BRAKE CONTROL MODULE REMOVAL/INSTALLATION.) MTX: •  Go to the next step.
3	VERIFY IF BACK-UP LIGHTS ARE ILLUMINATED •  Shift the shift lever to the reverse position. •  Are the back-up lights illuminated?	Yes	Replace the electric parking brake control module. (See ELECTRIC PARKING BRAKE CONTROL MODULE REMOVAL/INSTALLATION.)
		No	Go to the next step.
4	INSPECT BACK-UP LIGHT SWITCH CONNECTOR CONDITION •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) •  Disconnect the back-up light switch 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.
5	INSPECT BACK-UP LIGHT SWITCH •  Inspect the back-up light switch. (See BACK-UP LIGHT SWITCH INSPECTION.) •  Is the back-up light switch normal?	Yes	Go to the next step.
		No	Replace the back-up light switch. (See BACK-UP LIGHT SWITCH REMOVAL/INSTALLATION [C66M-R, C66MX-R].) (See BACK-UP LIGHT SWITCH REMOVAL/INSTALLATION [D66M-R, D66MX-R].)
6	INSPECT BACK-UP LIGHT SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT •  Verify that the back-up light switch connector is disconnected. •  Inspect the wiring harness for continuity between back-up light switch terminal D (wiring harness-side) and body ground. •  Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between back-up light switch terminal D and body ground. 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 an open circuit. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit.
7	INSPECT PCM CONNECTOR CONDITION •  Disconnect the PCM 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.
8	INSPECT BACK-UP LIGHT SWITCH CIRCUIT FOR SHORT TO GROUND •  Verify that the back-up light switch and PCM connectors are disconnected. •  Inspect for continuity between back-up light switch 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 the following terminals: •  SKYACTIV-G 2.0 ―  Back-up light switch terminal A—PCM terminal 1L •  SKYACTIV-D 2.2 ―  Back-up light switch terminal A—PCM terminal 1EH 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.
		No	Go to the next step.
9	INSPECT BACK-UP LIGHT SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY •  Verify that the back-up light switch and PCM connectors are disconnected. •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) •  Switch the ignition ON (engine off or on). •  Measure the voltage at the back-up light switch terminal A (wiring harness-side). •  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 the following terminals: •  SKYACTIV-G 2.0 ―  Back-up light switch terminal A—PCM terminal 1L •  SKYACTIV-D 2.2 ―  Back-up light switch terminal A—PCM terminal 1EH 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.
10	INSPECT BACK-UP LIGHT CIRCUIT FOR OPEN CIRCUIT •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) •  Verify that the back-up light switch and PCM connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side): ―  SKYACTIV-G 2.0 •  Back-up light switch terminal A—PCM terminal 1L ―  SKYACTIV-D 2.2 •  Back-up light switch terminal A—PCM terminal 1EH •  Is there continuity?	Yes	Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: •  SKYACTIV-G 2.0 ―  Back-up light switch terminal A—PCM terminal 1L •  SKYACTIV-D 2.2 ―  Back-up light switch terminal A—PCM terminal 1EH 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 an open circuit. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit.