Toyota Tundra. Manual — part 1073

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 (1GR-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 (1GR-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 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-fuses 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 (1GR-FE) - Tundra

HINT:

Cracks on the rib side of the belt are considered acceptable. If the belt has chunks missing from the
ribs, it should be replaced.

Fig. 5: Inspecting V-Ribbed Belt
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Check that the belt fits properly in the ribbed grooves.

HINT:

Confirm by hand that the belt has not slipped out of the grooves on the bottom of the pulley.

Fig. 6: Checking Belt Fits Properly In Ribbed Grooves
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

4. INSPECT GENERATOR WIRING

a. Visually check the generator wiring.

1. Check that the wiring is in good condition.

5. CHECK FOR ABNORMAL NOISES

a. Listen for abnormal noises from the generator.

1. Check that no abnormal noises are heard from the generator while the engine is running.

6. INSPECT CHARGE WARNING LIGHT CIRCUIT

a. Turn the ignition switch ON. Check that the charge warning light comes on.

b. Start the engine and check that the light goes off. If the light does not operate as specified,

troubleshoot the charge warning light circuit.

7. INSPECT CHARGING CIRCUIT WITHOUT LOAD

a. Connect a voltmeter and ammeter to the charging circuit as follows.

2009 Toyota Tundra

2009 ELECTRICAL Charging (1GR-FE) - Tundra