Toyota Tundra. Manual — part 1086

Fig. 4: Identifying Indicators Showing Battery Condition
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

RESISTANCE SPECIFIED CONDITION

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

3. INSPECT V-RIBBED BELT

a. Check the belt for wear, cracks or other signs of damage.

If any of the following defects is found, replace the fan and generator V belt.



The belt is cracked.



The belt is worn out to the extent that the cords are exposed.



The belt has chunks missing from the ribs.

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

HINT:

Check with your hand to confirm that the belt has not slipped out of the grooves on the bottom of
the pulley. If it has slipped out, replace the fan and generator V belt. Install a new fan and generator
V belt correctly.

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-FBE) - Tundra

Fig. 5: Identifying Correct And Incorrect Position Of Fitting Belt
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 to 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.

1. Disconnect the wire from terminal B of the generator, then connect it to the negative (-) lead

of an ammeter.

2. Connect the positive (+) lead of the ammeter to terminal B of the generator.

3. Connect the positive (+) lead of a voltmeter to the positive (+) terminal of the battery.

4. Ground the negative (-) lead of the voltmeter.

2009 Toyota Tundra

2009 ELECTRICAL Charging (3UR-FBE) - Tundra

Fig. 6: Inspecting Charging Circuit
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Check the charging circuit.

1. Keep the engine speed at 2000 RPM and check the reading on the ammeter and voltmeter.

Standard current:

10 A or less

Standard voltage:

13.2 to 14.8 V

If the voltmeter reading is higher than the standard voltage, replace the voltage regulator.

HINT:

If the battery is not fully charged, the ammeter reading will sometimes be higher than the
standard amperage.

8. INSPECT CHARGING CIRCUIT WITH LOAD

a. With the engine running at 2000 RPM, turn the high beam headlights ON and turn the heater

blower switch to the "HI" position.

b. Check the reading on the ammeter.

Standard current:

30 A or higher

If the ammeter reading is less than the standard amperage, repair the generator.

2009 Toyota Tundra

2009 ELECTRICAL Charging (3UR-FBE) - Tundra

HINT:

If the battery is fully charged, the indication will sometimes be less than the standard amperage. If
this is the case, add more electrical load (operate the wipers, rear window defogger, etc.) and check
the reading on the ammeter again.

GENERATOR

COMPONENTS

2009 Toyota Tundra

2009 ELECTRICAL Charging (3UR-FBE) - Tundra