DTC P0A1F-832: Battery Energy Control Module; DTC P0A1F-833: Battery Energy Control Module: Procedure

1. Check the connection of the auxiliary battery terminal.

   OK

   The terminal is connected securely and there is no contact problem.

NG → CONNECT SECURELY 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

1. Remove the IGCT relay from the No. 2 motor compartment relay block.
2. Disconnect the power management control ECU connectors.
   Fig 1: Measuring Resistance Of Power Management Control ECU - IGCT Relay Harness & Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	No. 2 Motor compartment Relay Block	*2	IGCT Relay
   *a	Rear view of wire harness connector (to Power Management Control ECU)	-	-

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A24-8 (+B1) - 5 (IGCT relay)	Power switch off	Below 1 Ω
   A23-6 (+B2) - 5 (IGCT relay)	Power switch off	Below 1 Ω

4. Install the IGCT relay.
5. Reconnect the power management control ECU connectors.

NG → REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check for intermittent problems. Refer to CHECK FOR INTERMITTENT PROBLEMS .
   1. Check the connection and terminal contact pressure of connectors and wire harnesses between the power management control ECU and the No. 2 motor compartment relay block assembly.
   2. When the power switch is on (READY), jiggle the connectors and wire harnesses between the power management control ECU and the No. 2 motor compartment relay block assembly.

   Result

   Result	Proceed to
   Problem symptom does not recur.	A
   Problem symptom recurs.	B

B → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

A: Go to next step 

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   6