DTC P0ABF-123: Hybrid Battery Pack Current Sensor Circuit; DTC P0AC1-123: Hybrid Battery Pack Current Sensor Circuit Low; DTC P0AC2-123: Hybrid Battery Pack Current Sensor Circuit High: Procedure

B → GO TO DTC CHART (HYBRID BATTERY SYSTEM) Refer to  DIAGNOSTIC TROUBLE CODE CHART  . 

A: Go to next step 

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 procedures, because this may cause a malfunction.

2. Remove the No. 1 hybrid vehicle battery carrier bracket sub-assembly. Refer to REMOVAL - Step 25 .
3. Disconnect only the c1 connector of the battery smart unit.
   Fig 1: Identifying Battery Smart Unit & C1 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Disconnect the c4 battery current sensor connector from the hybrid battery junction block assembly.
   Fig 2: Identifying C4 Battery Current Sensor Connector & Hybrid Battery Junction Block Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Measure the resistance according to the value(s) in the tables below.
   Fig 3: Checking For Open In Battery Smart Unit

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   c1-1 (IB) - c4-3 (IB)	Power switch off	Below 1 Ω
   c1-6 (GIB) - c4-2 (GIB)	Power switch off	Below 1 Ω
   c1-5 (VIB) - c4-1 (VIB)	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   c1-1 (IB) or c4-3 (IB) - Body ground and other terminals	Power switch off	10 kΩ or higher
   c1-6 (GIB) or c4-2 (GIB) - Body ground and other terminals	Power switch off	10 kΩ or higher
   c1-5 (VIB) or c4-1 (VIB) - Body ground and other terminals	Power switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Battery Smart Unit)
   *b	Front view of wire harness connector (to Hybrid Battery Junction Block Assembly)

6. Connect the battery smart unit connector.
7. Connect the battery current sensor connector to the hybrid battery junction block assembly.

   Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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 procedures, because this may cause a malfunction.

2. Remove the No. 1 hybrid vehicle battery carrier bracket sub-assembly. Refer to REMOVAL - Step 25 .
3. Connect the cable to the negative (-) auxiliary battery terminal.
4. Turn the power switch on (IG).
5. Measure the voltage according to the value(s) in the table below.
   Fig 4: Measuring Voltage Of Battery Smart Unit (VIB Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   c1-5 (VIB) - c1-6 (GIB)	Power switch on (IG)	4.6 to 5.4 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Battery Smart Unit)

   NOTE:

   Turning the power switch on (IG) with the service grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

6. Turn the power switch off.
7. Disconnect the cable from the negative (-) auxiliary battery terminal.
8. Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly.

NG → See step   6 

OK: Go to next step 

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 procedures, because this may cause a malfunction.

2. Remove the No. 1 hybrid vehicle battery carrier bracket sub-assembly. Refer to REMOVAL - Step 25 .
3. Connect the cable to the negative (-) auxiliary battery terminal.
4. Turn the power switch on (IG).
5. Measure the voltage according to the value(s) in the table below.
   Fig 5: Measuring Voltage Of Battery Smart Unit

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   c1-1 (IB) - c1-6 (GIB)	Power switch on (IG)	2.46 to 2.54 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Battery Smart Unit)

   NOTE:

   Turning the power switch on (IG) with the service grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

6. Turn the power switch off.
7. Disconnect the cable from the negative (-) auxiliary battery terminal.
8. Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly.

NG → See step   5 

OK → See step   6