Inspection Procedure

1. Check for the DTC.

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   DTC B2285 is not output	A
   DTC B2285 is output	B

B:  GO TO DTC B2285 

A: GO TO Next Step 

1. Disconnect the K73 ECU connector.
2. Disconnect the A54 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   K73-39 (STSW) - A54-22 (ST2)	Below 1 Ω
   K73-39 (STSW) or A54-22 (ST2) -Body ground	10 kΩ or higher

Fig 1: Identifying Power Source Control ECU And HV Control ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO Next Step 

1. Measure the output voltage of the power source control ECU.

   Standard voltage 

   STANDARD VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   39 (STSW) - Body ground	Power switch pressed with brake pedal depressed → After approx. 1 sec. has passed, release power switch	10 to 14 V → Below 1 V

   Fig 2: Identifying Power Source Control ECU Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE POWER SOURCE CONTROL ECU 

OK:  GO TO HYBRID CONTROL SYSTEM