Hybrid Vehicle Control ECU Communication Stop Mode [09/2017 - 05/2019]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the hybrid vehicle control ECU connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Hybrid Vehicle Control ECU)

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

   Standard Resistance

   BUS 2 BRANCH WIRE
   
   

   Tester Connection	Condition	Specified Condition
   I115-34 (CA2H) - I115-35 (CA2L)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

   BUS 5 MAIN WIRE
   
   

   Tester Connection	Condition	Specified Condition
   I116-25 (CA1H) - I116-24 (CA1L)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

   Result

   Result	Proceed to
   OK	A
   NG (Bus 2 branch wire)	B
   NG (Bus 5 main wire)	C

Result: 

B 

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR 

Result: 

C 

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

Result: 

A 

See step  2

1. Disconnect the hybrid vehicle control ECU connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Rear view of wire harness connector (to Hybrid Vehicle Control ECU)

   -

   -

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I115-6 (E1) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
   I115-5 (E01) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
   I116-4 (E12) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
   I116-5 (E02) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

3. 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 [09/2017 - 05/2019]

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   I116-3 (BATT) - Body ground	Power switch off	11 to 14 V
   A60-1 (+B2) - Body ground	Auxiliary battery voltage applied to terminal A61-6 (MREL)	11 to 14 V
   A61-4 (+B1) - Body ground	Auxiliary battery voltage applied to terminal A61-6 (MREL)	11 to 14 V
   A60-3 (IG2) - Body ground	Power switch on (IG)	11 to 14 V
   	Power switch off	Below 1 V
   A60-22 (ACCI) - Body ground	Power switch on (ACC)	11 to 14 V
   	Power switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [10/2014 - 05/2019] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRSUIT)