TROUBLE SHOOTING
Note. See TROUBLE SHOOTING article in GENERAL INFORMATION.
Check all fuses, fusible links, ignition switch and appropriate relays (if equipped). Check generator output. See NO-LOAD TEST under ON-VEHICLE TESTING.
NO-LOAD TEST
- Disconnect battery-to-generator terminal "B" wire. (Scheme 16) Using an ammeter and voltmeter, connect negative ammeter lead to disconnected generator terminal "B" wire end, and connect positive ammeter lead to generator terminal "B".
- Connect voltmeter positive lead to generator terminal "B" and negative lead to ground. (Scheme 16) Start engine and increase engine speed to 2000 RPM. Both meters should read within specification. See «GENERATOR REGULATED OUTPUT SPECIFICATIONS»(ref-8274-S02716090472000081700000) table. If voltage is more than specified, replace IC regulator. If voltage is less than specified, go to next step.
- Locate small hole in back of generator. (Scheme 17) It may be necessary to remove generator end cover to access hole in back of generator. Using a probe, ground (full field) generator terminal "F" to generator case. (Scheme 17) If voltage is more than specified range, replace IC regulator. If voltage is less than specified range, repair or replace generator.
| Application | Amps | Volts | |
|---|---|---|---|
| Avalon | 10 Or Less | 13.2-14.8 | |
| Camry, Camry Solara, Corolla & ECHO | 10 Or Less | 13.5-15.1 | |
| Celica & RAV4 | |||
| With Temperature At 77°F (25°C) | 10 Or Less | 14.0-15.1 | |
| With Temperature At 239°F (115°C) | 10 Or Less | 13.5-14.3 | |
| Land Cruiser & Sienna | 10 Or Less | 13.2-14.8 | |
| MR2 | 10 Or Less | 13.2-14.0 | |
| Tacoma | |||
| With Temperature At 77°F (25°C) | 10 Or Less | 13.7-14.7 | |
| With Temperature At 239°F (115°C) | 10 Or Less | 13.2-14.0 | |
| Tundra | |||
| V6 | 10 Or Less | 13.2-14.8 | |
| V8 | |||
| With Temperature At 77°F (25°C) | 10 Or Less | 13.7-14.7 | |
| With Temperature At 239°F (115°C) | 10 Or Less | 13.2-14.0 | |
| 4Runner | |||
| With Temperature At 77°F (25°C) | 10 Or Less | 13.7-14.7 | |
| With Temperature At 239°F (115°C) | 10 Or Less | 13.2-14.0 | |
| (1) Specification given is with engine speed at 2000 RPM. | |||
| (1) | Specification given is with engine speed at 2000 RPM. |
GENERATOR REGULATED OUTPUT SPECIFICATIONS (1)
Scheme 16
Scheme 17
LOAD TEST
Note. If battery is fully charged, disable ignition system. Crank engine for about 15 seconds to partially discharge battery.
- Connect an ammeter as described in «NO-LOAD TEST»(ref-8274-S30017690982000081700000), step 1). (Scheme 16) Start engine. Turn on high beam headlights and place heater blower control on HI. Increase engine speed to 2000 RPM.
- Check ammeter reading. Ammeter should read 30 amps or more. If amperage is less than specified, repair or replace generator.
Note. If battery is fully charged, generator load test results may be less than 30 amps.