DTC P1602: Deterioration of Battery [08/2013 - ]: Procedure

1. Check the charging system.

   Refer to ON-VEHICLE INSPECTION [08/2013 - ] 

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPAIR OR REPLACE CHARGING SYSTEM 

Result:  1

OK 

See step  2

1. Disconnect the A24 generator control ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Generator Control ECU Assembly)

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A24-5 (AM21) - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

CHECK FOR INTERMITTENT PROBLEMS. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2013 - 04/2014]  Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2014 - 08/2016]  Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 08/2017]  Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2017 - ] 

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR