DTC P0E56:00 [DC-DC CONVERTER (e-SKYACTIV)]

id300205058700

Warning

<<High voltage>>

•  If the necessary measures are not taken before servicing an electric vehicle, it could cause electrical shock and result in serious injury or, in the worst case, death. Before servicing the electric vehicle, refer to [HIGH VOLTAGE SERVICE CAUTIONS] in the general information and implement the necessary measures. (See HIGH VOLTAGE SERVICE CAUTIONS.)

Outline

System malfunction location	DC-DC converter high voltage input circuit: Low voltage malfunction
Detection condition	•  The DC-DC converter detects that the voltage value input from the high voltage battery to the DC-DC converter is less than 162 V for 0.1 s.
Fail-safe	•  Stops output from the DC-DC converter.
Possible cause	•  Junction box No.3 connector or terminals malfunction •  DC-DC converter connector or terminals malfunction •  Open circuit in DC-DC converter high voltage input circuit (+) •  Open circuit in junction box No.3 high voltage input circuit (+) •  Poor insulation between high voltage input circuit (+) and high voltage input circuit (−) for DC-DC converter •  Poor insulation between high voltage input circuit (+) and high voltage input circuit (−) for junction box No.3 •  Junction box No.3 malfunction ―  30 A fuse malfunction (built-into junction box No.3) •  DC-DC converter malfunction High voltage battery malfunction •  High voltage battery internal circuit malfunction

Diagnostic Procedure

Warning

<<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 JUNCTION BOX No.3 CONNECTOR FOR MALFUNCTION Warning <<High voltage>> •  Wear insulated gloves when working on a high voltage system. •  Remove the service plug. (See SERVICE PLUG REMOVAL/INSTALLATION.) •  After 10 min have elapsed after removing the service plug, perform a zero voltage verification at the voltage detection point of the junction box No.3 to verify that there is no electrical charge in the high voltage circuit. •  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.
3	INSPECT DC-DC CONVERTER CONNECTOR FOR MALFUNCTION Warning <<High voltage>> •  Wear insulated gloves when working on a high voltage system. •  Verify that the service plug is removed. •  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.
4	INSPECT DC-DC CONVERTER HIGH VOLTAGE INPUT CIRCUIT (+) FOR OPEN CIRCUIT Warning <<High voltage>> •  Wear insulated gloves when working on a high voltage system. •  Verify that the service plug is removed. •  Refer to the high voltage cable continuity inspection and inspect the continuity between the following terminals. ―  DC-DC converter side terminal 1A—Junction box No.3 side terminal 3D (See HIGH VOLTAGE CABLE INSPECTION [(E)].) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
5	INSPECT JUNCTION BOX No.3 HIGH VOLTAGE INPUT CIRCUIT (+) FOR OPEN CIRCUIT Warning <<High voltage>> •  Wear insulated gloves when working on a high voltage system. •  Verify that the service plug is removed. •  Refer to the high voltage cable continuity inspection and inspect the continuity between the following terminals. ―  High voltage battery side terminal D—Junction box No.3 side terminal 1A (See HIGH VOLTAGE CABLE INSPECTION [(E)].) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
6	INSPECT FOR POOR INSULATION BETWEEN HIGH VOLTAGE INPUT CIRCUIT (+) AND HIGH VOLTAGE INPUT CIRCUIT (−) FOR DC-DC CONVERTER Warning <<High voltage>> •  Wear insulated gloves when working on a high voltage system. •  Verify that the service plug is removed. •  Refer to the high voltage cable insulation inspection and inspect the following cable for poor insulation between the high voltage input circuit (+) and high voltage input circuit (−). ―  High voltage cable (DC-DC converter cable) (See HIGH VOLTAGE CABLE INSPECTION [(E)].) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
7	INSPECT FOR POOR INSULATION BETWEEN HIGH VOLTAGE INPUT CIRCUIT (+) AND HIGH VOLTAGE INPUT CIRCUIT (−) FOR JUNCTION BOX No.3 Warning <<High voltage>> •  Wear insulated gloves when working on a high voltage system. •  Verify that the service plug is removed. •  Refer to the high voltage cable insulation inspection and inspect the following cable for poor insulation between the high voltage input circuit (+) and high voltage input circuit (−). ―  High voltage cable (See HIGH VOLTAGE CABLE INSPECTION [(E)].) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
8	INSPECT JUNCTION BOX No.3 FOR MALFUNCTION Warning <<High voltage>> •  Wear insulated gloves when working on a high voltage system. •  Inspect the applicable part. (See JUNCTION BOX No.3 INSPECTION.) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (See JUNCTION BOX No.3 REMOVAL/INSTALLATION.)
9	INSPECT HIGH VOLTAGE BATTERY FOR MALFUNCTION DEPENDING ON REPEATABILITY 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.) •  Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Warning •  While performing this step, always operate the vehicle in a safe and lawful manner. •  When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. ―  Drive the vehicle under the snapshot data condition for 0.1 s or more. •  Perform the DTC inspection for the DC-DC converter. (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, replace the high voltage battery, perform the repair completion verification 1. (See HIGH VOLTAGE BATTERY REMOVAL/INSTALLATION.)
		No	Go to repair completion verification 2.
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.) •  Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Warning •  While performing this step, always operate the vehicle in a safe and lawful manner. •  When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. ―  Drive the vehicle under the snapshot data condition for 0.1 s or more. •  Perform the DTC inspection for the DC-DC converter. (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 DC-DC converter, then go to the next step. (See DC-DC CONVERTER 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.