Inspection Procedure

READ VALUE USING TECHSTREAM (BATTERY CURRENT)

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.

Using the Techstream, read the Data List.

Fig 1: Measuring Battery Current

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Electric Power Control

ELECTRIC POWER CONTROL REFERENCE CHART

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

INSPECT BATTERY CURRENT SENSOR ASSEMBLY (TEMPERATURE SENSOR VOLTAGE)

Disconnect the A49 sensor connector.

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

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

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
A49-1 (THB) - A49-4 (E2)	(0 to 70°C (32 to 158°F))	(0.3 to 6.0 kΩ)

NOTE: The temperature shown in the inspection condition is for the area surrounding the sensor, not the sensor itself.

Fig 2: Identifying A49 Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE BATTERY CURRENT SENSOR ASSEMBLY (See REMOVAL )

OK: Go to next step

CHECK HARNESS AND CONNECTOR (ELECTRIC POWER CONTROL ECU - BATTERY CURRENT SENSOR)

Disconnect the A69 ECU connector.
Disconnect the A49 sensor connector.

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

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

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

Fig 3: Identifying A49 Sensor Connector And A69 ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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

CHECK BATTERY CURRENT SENSOR ASSEMBLY (VC5 VOLTAGE)

Disconnect the A49 sensor connector.

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

Standard voltage

STANDARD VOLTAGE REFERENCE CHART

Tester Connection	Switch Condition	Specified Condition
A49-2 (VC5) - A49-4 (E2)	Engine switch on (IG)	4.5 to 5.5 V

Fig 4: Identifying A49 Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step 6

NG: Go to next step

CHECK HARNESS AND CONNECTOR (ELECTRIC POWER CONTROL ECU - BATTERY CURRENT SENSOR)

Disconnect the A69 ECU connector.
Disconnect the A49 sensor connector.

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

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

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

Fig 5: Identifying A49 Sensor Connector And A69 ECU Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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

CHECK HARNESS AND CONNECTOR (ELECTRIC POWER CONTROL ECU - BATTERY CURRENT SENSOR)

Disconnect the A69 ECU connector.
Disconnect the A49 sensor connector.

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

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

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

Fig 6: Identifying A49 Sensor Connector And A69 ECU Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK BATTERY CURRENT SENSOR ASSEMBLY (OPERATION)
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)