Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2020RAV4 XLE, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 54 (CAN COMMUNICATION SYSTEM (HV) - CIRCUIT TESTS (2 OF 6))CAN COMMUNICATION SYSTEM (FOR HV MODEL)MOTOR GENERATOR CONTROL ECU COMMUNICATION STOP MODE [02/2019 - 08/2020]PROCEDURE

2020 Toyota RAV4 XLE, AWD

Motor Generator Control ECU Communication Stop Mode [02/2019 - 08/2020]: Procedure

2020 Toyota RAV4 XLE, AWDSECTION Procedure

WARNING: This page is about a different variant/trim than selected.

CHECK VEHICLE TYPE

Check for vehicle type.

Result

Result	Proceed to
for 2WD	A
for AWD	B

Result:

See step 4

Result:

See step 2

CHECK FOR OPEN IN CAN BUS WIRE (INVERTER WITH CONVERTER ASSEMBLY BRANCH WIRE)

Disconnect the cable from the negative (-) auxiliary battery terminal.

Disconnect the inverter with converter assembly connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Inverter with Converter Assembly)

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
A51-1 (CANH) - A51-7 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR

Result:

See step 3

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

Measure the resistance according to the value(s) in the table below.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Inverter with Converter Assembly)

Standard Resistance

Tester Connection	Condition	Specified Condition
A51-23 (GND2) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
A51-24 (GND1) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

Reconnect the cable to the negative (-) auxiliary battery terminal.
NOTE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

Refer to INITIALIZATION [02/2019 - 10/2019] , or refer to INITIALIZATION [10/2019 - 06/2020] , or refer to INITIALIZATION [06/2020 - 08/2020]

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
A51-5 (+B2) - Body ground	Ignition switch ON	11 to 14 V
A51-5 (+B2) - Body ground	Ignition switch off	Below 1 V
A51-6 (+B) - Body ground	Ignition switch ON	11 to 14 V
A51-6 (+B) - Body ground	Ignition switch off	Below 1 V
A51-12 (IGCT) - Body ground	Ignition switch ON	11 to 14 V
A51-12 (IGCT) - Body ground	Ignition switch off	Below 1 V

Result

Proceed to
OK
NG

Result:

REPLACE MG ECU (REPLACE INVERTER WITH CONVERTER ASSEMBLY)

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK FOR OPEN IN CAN BUS WIRE (INVERTER WITH CONVERTER ASSEMBLY BRANCH WIRE)

Disconnect the cable from the negative (-) auxiliary battery terminal.

Disconnect the inverter with converter assembly connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Inverter with Converter Assembly)

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
A87-22 (CANH) - A87-31 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω
A87-24 (CNH2) - A87-33 (CNL2)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR

Result:

See step 5

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
A87-9 (GND1) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
A87-8 (GND2) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Inverter with Converter Assembly)

Reconnect the cable to the negative (-) auxiliary battery terminal.
NOTE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

Refer to INITIALIZATION [02/2019 - 10/2019] , or refer to INITIALIZATION [10/2019 - 06/2020] , or refer to INITIALIZATION [06/2020 - 08/2020]

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
A87-35 (+B2) - Body ground	Ignition switch ON	11 to 14 V
A87-35 (+B2) - Body ground	Ignition switch off	Below 1 V
A87-36 (+B) - Body ground	Ignition switch ON	11 to 14 V
A87-36 (+B) - Body ground	Ignition switch off	Below 1 V
A87-26 (IGCT) - Body ground	Ignition switch ON	11 to 14 V
A87-26 (IGCT) - Body ground	Ignition switch off	Below 1 V

Result

Proceed to
OK
NG

Result:

REPLACE INVERTER WITH CONVERTER ASSEMBLY

Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 06/2020] , or refer to REMOVAL [06/2020 - 08/2020]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.