DTC P0ADF-229: EV Battery Negative Contactor Control Circuit Low: Procedure

1. Disconnect the power management control ECU connector.
2. Measure the resistance according to the value(s) in the table below.
   Fig 1: Measuring Resistance Of Power Management Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   C21-5 (SMRG) - Body ground	Power switch off 20°C (68°F)	30.6 to 37.4 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Power Management Control ECU)

3. Reconnect the power management control ECU connector.

OK → See step   3 

NG → See step   2 

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

2. Disconnect the electric vehicle battery assembly connector.
   Fig 2: Identifying Electric Vehicle Battery Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the power management control ECU connector.
4. Measure the resistance according to the value(s) in the table below.
   Fig 3: Measuring Resistance Of Power Management Control ECU - Electric Vehicle Battery Assembly Harness & Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   C21-5 (SMRG) and Gi1-15 - Body ground and other terminals	Power switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Power Management Control ECU)
   *b	Front view of wire harness connector (to Electric Vehicle Battery Assembly)

5. Reconnect the power management control ECU connector.
6. Reconnect the electric vehicle battery assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4 

1. Even though it has been determined that the power management control ECU needs to be replaced, make sure to inspect the voltage difference between No. 1 EV battery and No. 2 EV battery before replacing it.

NEXT → See step   5