- a) Make sure that the wire clamps on the battery terminals are clean and securely fastened.
- b) Check the battery status (see paragraph 3). If it does not pass all the tests, replace it.
- c) Check the external electrical wiring and generator connections.
- d) Check the condition and tension of the drive belt (see chapter 1)
- d) Check the reliability of the tightening of the generator mounting bolts
- e) Start the engine and check for any unusual noise coming from the generator.
- g) Check the fuse link (see chapter 12). If it is burnt out, find out the reason and repair the electrical circuit.
- h) Check the charging system indicator light on the instrument panel. It should light when the ignition key is turned to the on position (the engine is not working). If it does not light, check the electrical circuit between the generator and the test lamp (see "Electrical diagrams" at the end of Chapter 12).
- i) Check the fuses that are located in series with the charging system electrical circuit (see "Electrical diagrams" at the end of Chapter 12).
2. With the ignition off, check the battery voltage with all electrical consumers off. It should be approximately in the range of 12.5-12.9 V (Fig. 3.2). If the engine has been running for the last hour, it may be slightly higher.
3. Connect the ammeter to the charging system following the manufacturer's instructions. Start the engine and check the battery voltage and current. The reading should now be approximately 13.2-14.8 V (Fig. 9.3).
Fig. 9.3. To check the charging voltage, connect a voltmeter to the battery terminals and check the battery voltage with the engine running
4. Load the battery. To do this, turn on the high beam headlights and the air conditioning system and set the blower speed to maximum. Increase the engine speed to 2000 rpm and check the voltage and current. If the charging system is working properly, the voltage should remain above 13.5 V, and the current should be at least 30 A (and depending on the battery condition it may be less than 30 A).
5. If the voltage rises above 15.0 V when performing any test, the voltage regulator is faulty.
6. If the voltage reading is less than the specified charging voltage, the alternator is probably faulty. Have the charging system checked by your dealer service department or other properly equipped person.
(The full article is posted on the website: toyotaman.ru)
Note: Many auto parts stores can test the alternator on a bench after it has been removed from the vehicle. Ask about this service at your local auto parts store; in many stores this service is provided free of charge.