Inspection Procedure

1. Clear the DTC (See DIAGNOSIS SYSTEM  )
2. Turn the engine switch on (IG)
3. Depress the brake pedal
4. After 6 seconds have elapsed, check if the trouble occurs again
5. Check for DTCs again

   OK: B2271 is not output. 

NG: Go to step 2 

OK: USE SIMULATION METHOD TO CHECK  (See HOW TO PROCEED WITH TROUBLESHOOTING )

1. Remove the AM2 fuse from the main body ECU RH (cowl side junction block RH)
2. Measure the resistance according to the value (s) in the table below

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   AM2 fuse	Always	Below 1 Ω

NG: REPLACE FUSE (AM2 FUSE) 

OK: Go to next Step 

1. Disconnect the J55 connector from power source control ECU
2. Measure the voltage according to the value (s) in the table below

   Standard Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   J55-12 (AM2) - Body ground	Always	11 to 14 V
   J55-33 (AM1) - Body ground	Always	11 to 14 V

Fig 1: Identifying J55 Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CONTROL ECU - BODY GROUND) 

OK: REPLACE POWER SOURCE CONTROL ECU