Toyota Tundra. Manual — part 1092

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

SYSTEM DIAGRAM

2009 Toyota Tundra

2009 ELECTRICAL Charging (3UR-FE) - 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-FE) - 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.

1. For maintenance-free batteries:



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.).

2. For non-maintenance-free batteries:



If the electrolyte quantity is below the lower line, add distilled water to each cell. Then,
recharge the battery and check the electrolyte's specific gravity.

Standard specific gravity: 1.25 to 1.29 at 20°C (68°F)



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. 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)

HINT:

If the voltage is less than the specification, charge the battery.

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

2009 Toyota Tundra

2009 ELECTRICAL Charging (3UR-FE) - Tundra

d. Reference:

The indicator shows the battery condition (If battery is equipped with indicator).

HINT:



Blue: OK



White: Charging necessary



Red: Insufficient electrolyte

Fig. 4: Identifying Battery Indicator
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2. INSPECT BATTERY TERMINAL AND FUSE

a. Visually check the battery terminals.

1. Check that the battery terminals are not loose or corroded.

b. Check the H-fuse and fuses.

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

Standard resistance

BATTERY TERMINAL AND FUSE TESTER CONNECTION SPECIFIED
CONDITION CHART

If the result is not as specified, replace the fuses as necessary.

3. INSPECT V-RIBBED BELT

a. Visually check the belt for excessive wear, frayed cords, etc.

If any defects are found, replace the V-ribbed belt.

Tester Connection Condition Specified Condition

ALT H-fuse

Always

Below 1 ohms

ALT-S fuse

MET fuse

LH-IG fuse

2009 Toyota Tundra

2009 ELECTRICAL Charging (3UR-FE) - Tundra