DTC U0605:00 [PCM (e-SKYACTIV)]

id300202100100

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	LIN communication system: Communication error between electric compressor and PCM
Detection condition	•  PCM detects a communication error between the PCM and electric compressor.
Fail-safe	•  Refer to "DTC Table" and "Fail-safe Function Malfunction Contents Table". (See DTC TABLE [PCM (e-SKYACTIV)].)
Possible cause	•  Electric compressor controller connector or terminals malfunction •  PCM connector or terminals malfunction •  PTC heater controller connector or terminals malfunction •  Electric water pump connector or terminals malfunction •  Short to power supply in electric compressor controller LIN communication line •  Short to ground in electric compressor controller LIN communication line •  Short to ground in PTC heater controller LIN communication line •  Short to ground in electric water pump LIN communication line •  Open circuit in electric compressor LIN communication line •  Electric compressor malfunction •  PTC heater malfunction •  Electric water pump malfunction •  PCM 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 ELECTRIC COMPRESSOR 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.
3	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.
4	INSPECT PTC HEATER CONTROLLER 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 ELECTRIC WATER PUMP 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.
6	INSPECT ELECTRIC COMPRESSOR CONTROLLER LIN COMMUNICATION LINE FOR SHORT TO POWER SUPPLY •  Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) •  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 ELECTRIC COMPRESSOR CONTROLLER LIN COMMUNICATION LINE FOR OPEN CIRCUIT •  Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) •  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 LIN COMMUNICATION LINES OF PTC HEATER CONTROLLER, ELECTRIC COMPRESSOR CONTROLLER, ELECTRIC WATER PUMP FOR SHORT TO GROUND •  Disconnect the connectors of the PCM, PTC heater controller, electric compressor controller, and the electric water pump. •  Inspect for continuity between the electric water pump terminal B (wiring harness-side) and body ground. •  Is there continuity?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
		No	Go to the next step.
9	INSPECT LIN COMMUNICATION LINE IN ELECTRIC COMPRESSOR CONTROLLER FOR SHORT CIRCUIT •  Connect the PCM connector. •  Verify that the PTC heater controller connector, electric compressor controller connector and electric water pump connector is disconnected. •  Measure the voltage at electric water pump connector terminal B on the vehicle side and verify that the voltage is other than 0 V. •  Connect the electric compressor controller connector. •  Measure the voltage at electric water pump connector terminal B on the vehicle side. •  Does the voltage change to 0 V?	Yes	A short circuit in the LIN communication line in the electric compressor controller can be considered. •  Replace the electric compressor, then go to repair completion verification 1. (See ELECTRIC COMPRESSOR REMOVAL/INSTALLATION.)
		No	Go to the next step.
10	INSPECT LIN COMMUNICATION LINE IN PTC HEATER CONTROLLER FOR SHORT TO GROUND •  Connect the PCM connector. •  Verify that the PTC heater controller connector, electric compressor controller connector and electric water pump connector is disconnected. •  Measure the voltage at electric water pump connector terminal B on the vehicle side and verify that the voltage is other than 0 V. •  Connect the PTC heater controller connector. •  Measure the voltage at electric water pump connector terminal B on the vehicle side. •  Does the voltage change to 0 V?	Yes	A short circuit in the LIN communication line in the PTC heater controller can be considered. •  Replace the PTC heater, then go to repair completion verification 1. (See POSITIVE TEMPERATURE COEFFICIENT (PTC) HEATER REMOVAL/INSTALLATION.)
		No	Go to the next step.
11	INSPECT LIN COMMUNICATION LINE IN ELECTRIC WATER PUMP FOR SHORT CIRCUIT •  Connect the PCM connector. •  Verify that the PTC heater controller connector, electric compressor controller connector and electric water pump connector is disconnected. •  Measure the voltage at electric compressor controller terminal C on the vehicle side and verify that the voltage is other than 0 V. •  Connect the electric water pump connector. •  Measure the voltage at electric compressor controller connector terminal C on the vehicle side. •  Does the voltage change to 0 V?	Yes	A short circuit in the LIN communication line in the electric water pump can be considered. •  Replace the electric water pump, then go to repair completion verification 1. (See ELECTRIC WATER PUMP REMOVAL/INSTALLATION.)
		No	Go to the next step.
12	VERIFY WHETHER MALFUNCTION IS PRESENT OR PAST •  Perform the DTC inspection for the PCM. (See DTC INSPECTION.) •  Is DTC U0605:00 a present malfunction?	Yes	•  Replace the electric compressor, then go to repair completion verification 1. (See ELECTRIC COMPRESSOR REMOVAL/INSTALLATION.)
		No	Go to 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.) •  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. •  Perform the DTC inspection for the PCM. (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 PCM, then go to the next step. (See PCM 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.