Toyota Tundra. Manual — part 1085

2009 ELECTRICAL

Charging (3UR-FBE) - Tundra

CHARGING SYSTEM

PRECAUTION

1. PRECAUTION

a. Check that the battery cables are connected to the correct terminals.

b. Disconnect the battery cables when the battery is given a quick charge.

c. Do not perform tests with a high voltage insulation resistance tester.

d. Never disconnect the battery while the engine is running.

e. Check that the charging cable nut is securely installed to terminal B of the generator and the fuse

box.

PARTS LOCATION

2009 Toyota Tundra

2009 ELECTRICAL Charging (3UR-FBE) - Tundra

2009 Toyota Tundra

2009 ELECTRICAL Charging (3UR-FBE) - Tundra

Fig. 1: Charging System Parts Location
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

SYSTEM DIAGRAM

2009 Toyota Tundra

2009 ELECTRICAL Charging (3UR-FBE) - Tundra

Fig. 2: Charging System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

ON-VEHICLE INSPECTION

1. CHECK BATTERY CONDITION

NOTE:

If the battery is weak or if the engine is difficult to start, perform the
following procedures.

2009 Toyota Tundra

2009 ELECTRICAL Charging (3UR-FBE) - Tundra

a. Check the battery for damage and deformation. If severe damage, deformation or leakage is found,

replace the battery.

b. Check the electrolyte quantity of each cell.



If the electrolyte quantity is below the lower line, replace the battery.



If the electrolyte quantity is above the lower line, check the battery voltage when cranking
the engine. If the voltage is less than 9.6 V, recharge or replace the battery.

HINT:

Before checking the battery voltage, turn off all the electrical systems (headlights, blower
motor, rear defogger, etc.).

c. Turn the ignition switch off and turn on the headlight for 20 to 30 seconds. This will remove the

surface charge from the battery.

d. Measure the battery voltage between the negative (-) and positive (+) terminals of the battery.

Standard voltage:

12.5 to 12.9 V at 20°C (68°F)

If the voltage is below the specification, recharge the battery.

Fig. 3: Measuring Battery Voltage
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

e. Reference:

The indicator shows the battery condition.

HINT:



Blue: OK



White: Charging necessary



Red: Insufficient electrolyte

2009 Toyota Tundra

2009 ELECTRICAL Charging (3UR-FBE) - Tundra