DTC U0115:00 [BECM (e-SKYACTIV)]

System malfunction location	CAN communication system: AT-BUS communication error
Detection condition	• The following conditions occur at the BECM. ― No CAN signal for AT-BUS is received for 1 s. ― A sequence counter error is detected for 1 s. ― A check sum error is detected for 1 s. ― Bus off is detected. ― A CAN RAM error at the time of CAN controller initialization is detected 11 times. Precondition • 1.5 s have elapsed after main power is switched ON (READY off or on). • Lead-acid battery voltage: 10 V or more for continuous 1.5 s
Fail-safe	• Refer to "DTC Table" and "Fail-safe Function Malfunction Contents Table". (See DTC TABLE [BECM (e-SKYACTIV)].)
Possible cause	• CAN communication line malfunction between PCM and BECM • PCM connector or terminals malfunction • Common connector (C-67) connector or terminals malfunction High voltage battery malfunction • Internal parts malfunction

System malfunction location

CAN communication system: AT-BUS communication error

Detection condition

• The following conditions occur at the BECM.

― No CAN signal for AT-BUS is received for 1 s.

― A sequence counter error is detected for 1 s.

― A check sum error is detected for 1 s.

― Bus off is detected.

― A CAN RAM error at the time of CAN controller initialization is detected 11 times.

Precondition

• 1.5 s have elapsed after main power is switched ON (READY off or on).

• Lead-acid battery voltage: 10 V or more for continuous 1.5 s

Fail-safe

• Refer to "DTC Table" and "Fail-safe Function Malfunction Contents Table". (See DTC TABLE [BECM (e-SKYACTIV)].)

Possible cause

• CAN communication line malfunction between PCM and BECM

• PCM connector or terminals malfunction

• Common connector (C-67) connector or terminals malfunction

High voltage battery malfunction

• Internal parts malfunction

<<High voltage>>

• If necessary measures such as wearing the correct protective gear are not taken when inspecting or removing/installing the high voltage parts, it could cause electrical shock and result in serious injury or, in the worst case, death.

• Before inspecting or removing/installing the high voltage parts, refer to [HIGH VOLTAGE SERVICE CAUTIONS] in the general information and [High Voltage Part Inspection and Removal/Installation Notes] of the high voltage system service cautions and implement the necessary measures and preparations. (See HIGH VOLTAGE SERVICE CAUTIONS.) (See HIGH VOLTAGE SYSTEM SERVICE CAUTIONS.)

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	INSPECT FOR OTHER RELATED DTCs • Perform the DTC inspection for the BECM. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [BECM (e-SKYACTIV)].)
No	Go to the next step.
3	VERIFY PCM DTC • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (e-SKYACTIV)].)
No	Go to the next step.
4	INSPECT PCM CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
5	INSPECT COMMON CONNECTOR (C-67) CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED Warning <<High voltage>> • Wear insulated gloves when working on a high voltage system. • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Switch the main power ON (READY off or on) and wait for 10 s or more. • Perform the DTC inspection for the BECM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the high voltage battery, then go to the next step. (See HIGH VOLTAGE BATTERY REMOVAL/INSTALLATION.)
No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
No	DTC troubleshooting completed.

Step

Inspection

Results

Action

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

• Record the snapshot data.

Note

• Recording can be facilitated using the screen capture function of the PC.

—

Go to the next step.

INSPECT FOR OTHER RELATED DTCs

• Perform the DTC inspection for the BECM.

(See DTC INSPECTION.)

• Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [BECM (e-SKYACTIV)].)

Go to the next step.

VERIFY PCM DTC

• Perform the DTC inspection for the PCM.

(See DTC INSPECTION.)

• Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (e-SKYACTIV)].)

Go to the next step.

INSPECT PCM CONNECTOR FOR MALFUNCTION

• Inspect the applicable connector and terminal.

(See CONNECTOR INSPECTION.)

• Are the connector and terminal normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification 1.

INSPECT COMMON CONNECTOR (C-67) CONNECTOR FOR MALFUNCTION

• Inspect the applicable connector and terminal.

(See CONNECTOR INSPECTION.)

• Are the connector and terminal normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification 1.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

Warning

<<High voltage>>

• Wear insulated gloves when working on a high voltage system.

• Install/connect the part removed/disconnected during the troubleshooting procedure.

• Clear the DTC recorded in the memory.

(See CLEARING DTC.)

• Switch the main power ON (READY off or on) and wait for 10 s or more.

• Perform the DTC inspection for the BECM.

(See DTC INSPECTION.)

• Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, perform the diagnosis from Step 1.

• If the malfunction recurs, replace the high voltage battery, then go to the next step.

(See HIGH VOLTAGE BATTERY REMOVAL/INSTALLATION.)

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

• Perform the DTC inspection.

(See DTC INSPECTION.)

• Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

DTC troubleshooting completed.