Inspection Procedure

1. Put the vehicle in a no load test condition. Then set the headlights to high beam, set the heater blower switch to Hi, and run the engine at 2000 rpm. Using an electrical tester and probes, measure the current.
Fig 1: Setting Heater Blower Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using the Techstream, read the Data List.

   Electric Power Control 

   DATA LIST REFERENCE
   
   

   Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
   Electrical Charge Current	Current battery current value display/ Min.: -300, Max.: 100 [A]	Amperage value is displayed	-

   OK: Values of electrical tester and the Techstream are almost the same. 

NG: Go to step  4

OK: Go to next step 

1. Disconnect the A49 sensor connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A49-1 (THB) - A49-4 (E2)	20 to 30°C (68 to 86°F)	1.5 to 2.1 kΩ
   	(0 to 70°C (32 to 158°F))	(0.3 to 6.0 kΩ)

   Fig 2: Identifying Battery Current Sensor Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE: The temperature shown in the inspection condition is for the area surrounding the sensor, not the sensor itself.

NG: REPLACE BATTERY CURRENT SENSOR ASSEMBLY  (See REMOVAL  )

OK: Go to next step 

1. Disconnect the A69 ECU connector.
Fig 3: Identifying A69 ECU And A49 Sensor Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A49 sensor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A69-20 (THB) - A49-1 (THB)	Always	Below 1 Ω
   A69-20 (THB) or A49-1 (THB) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE PASSENGER SIDE JUNCTION BLOCK (ELECTRIC POWER CONTROL ECU) 

1. Disconnect the A49 sensor connector.
Fig 4: Identifying A49 Battery Current Sensor Assembly Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   STANDARD VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   A49-2 (VC5) - A494 (E2)	Engine switch on (IG)	4.5 to 5.5 V

OK: Go to step  6

NG: Go to next step 

1. Disconnect the A69 ECU connector.
Fig 5: Identifying A69 ECU And A49 Sensor Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A49 sensor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A69-6 (VC) - A49-2 (VC5)	Always	Below 1 Ω
   A69-10 (E2) - A49-4 (E2)	Always	Below 1 Ω
   A69-6 (VC) or A49-2 (VC5) - Body ground	Always	10 kΩ or higher
   A69-10 (E2) or A49-4 (E2) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE PASSENGER SIDE JUNCTION BLOCK (ELECTRIC POWER CONTROL ECU) 

1. Disconnect the A69 ECU connector.
Fig 6: Identifying A69 ECU And A49 Sensor Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A49 sensor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A69-9 (IB) - A49-3 (IB)	Always	Below 1 Ω
   A69-9 (IB) or A49-3 (IB) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the battery current sensor with a new or normally functioning one (see REMOVAL  ).
2. Delete the DTC (see DTC CHECK / CLEAR  ).
3. Check for DTC again (see DTC CHECK / CLEAR  ).

   OK: No DTC is output. 

NG: REPLACE PASSENGER SIDE JUNCTION BLOCK (ELECTRIC POWER CONTROL ECU) 

OK: END (BATTERY CURRENT SENSOR IS DEFECTIVE)