DTC P0AFC-123: Hybrid Battery Pack Sensor Module: Procedure

1. Remove the IGCT NO. 3 fuse.
   Fig 1: Identifying Fuse (IGCT No. 3)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   IGCT NO. 3 fuse	Always	Below 1 Ω

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   *1	Engine Room No. 2 Relay Block
   *2	IGCT NO. 3 Fuse

NG → REPLACE FUSE (IGCT NO. 3) 

OK: Go to next step 

1. Remove the IGCT MAIN relay.
   Fig 2: Identifying IGCT Main Relay

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   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room No. 2 Relay Block
   *2	IGCT MAIN Relay

2. Measure the resistance according to the value(s) in the table below.
   Fig 3: Measuring Resistance Of IGCT Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	Auxiliary battery voltage is applied between terminals 1 and 2	below 1 Ω
   	Auxiliary battery voltage is not applied between terminals 1 and 2	10 kΩ or higher

NG → REPLACE RELAY (IGCT MAIN) 

OK: Go to next step 

1. Disconnect the cable from the negative (-) battery terminal.
2. Check that the service plug grip is not installed.
   NOTE:

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

3. Remove the battery cover. Refer to REMOVAL .
4. Remove the battery smart unit. Refer to REMOVAL .

   HINT: 

   Do not disconnect the battery smart unit connector.

5. Connect the cable to the negative (-) battery terminal.
6. Turn the ignition switch to ON.
7. Measure the voltage according to the value(s) in the table below.
   Fig 4: Checking Harness And Connector (IGCT Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

   If the ignition switch is turned ON with the service plug grip removed, DTC P0A0D-350 for the interlock switch system will be stored. If this DTC is output, clear the DTC using the Techstream. Refer to DTC CHECK / CLEAR .

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   z21-1 (IGCT) - z21-5 (GND)	Ignition switch ON	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Battery Smart Unit)

NG → See step   4 

OK → See step   6 

1. Disconnect the cable from the negative (-) battery terminal.
2. Remove the IGCT MAIN relay.
   Fig 5: Identifying IGCT Main Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room No. 2 Relay Block
   *2	IGCT MAIN Relay

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

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

4. Remove the battery cover. Refer to REMOVAL .
5. Disconnect the z21 connector from the battery smart unit.
6. Measure the resistance according to the value(s) in the table below.
   Fig 6: Checking Harness And Connector (Battery Smart Unit - IGCT Main Relay And Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   IGCT MAIN relay terminal 3 - z21-1 (IGCT)	Ignition switch off	Below 1 Ω
   z21-5 (GND) - Body ground	Ignition switch off	Below 1 Ω

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   *1	Rear view of wire harness connector (to Battery Smart Unit)
   *2	Engine Room No. 2 Relay Block
   *3	IGCT MAIN Relay Holder

NG → See step   5 

OK → CHECK AND REPAIR POWER SOURCE CIRCUIT 

1. Disconnect the cable from the negative (-) battery terminal.
2. Check that the service plug grip is not installed.
   NOTE:

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

3. Remove the battery cover. Refer to REMOVAL .
4. Disconnect the Oz3 connector from the No. 2 battery pack wire.
   Fig 7: Identifying OZ3 Connector And No. 2 Battery Pack Wire

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Disconnect the z21 connector from the battery smart unit.
6. Measure the resistance according to the value(s) in the table below.
   Fig 8: Checking Harness And Connector (No. 2 Battery Pack Wire)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   z21-1 (IGCT) - Oz3-6 (IGCT)	Ignition switch off	Below 1 Ω
   z21-5 (GND) - Oz3-13 (GND)	Ignition switch off	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Rear view of wire harness connector (to Battery Smart Unit)
   *2	Front view of wire harness connector (to No. 2 Battery Pack Wire Connector)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 BATTERY PACK WIRE) 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR