Symptom Related Diagnostic Procedures
TROUBLESHOOTING HINTS1. Charging warning light does not go on when the ignition switch is turned to ON, before the engine starts.
Check the bulb.
2. Charging warning light does not switch off after the engine starts.
Check the IC voltage regulator inside the generator.
3. Discharged or overcharged battery.
Check the IC voltage regulator inside the generator.
4. The charging warning light illuminates dimly.
Check the diode (inside the combination meter) for a short-circuit.
TROUBLESHOOTING GUIDE
The charging system troubleshooting guide is shown in the following chart.
STEP 1.
Q: Is the battery in good condition? (Refer to Battery - On-vehicle Service - Battery Check.)
YES: Go to Step 2.
NO: Charge or replace the battery.
STEP 2.
Q: Is the generator drive belt in good condition? (Refer to Maintenance Service - Drive Belts.)
YES: Go to Step 3.
NO: Adjust the belt tension or replace the belt.
STEP 3.
Q: Does the charging warning light come on when the ignition switch is turned on?
YES: Go to Step 4.
NO: - Check the ignition switch. (Refer to Ignition switch.)
- Check for burnt-out charging warning light.
- Check the generator. (Refer to Generator - Disassembly and assembly - Inspection.)
- Check the charging warning light-related circuits.
STEP 4.
Q: Does the charging warning light go out after starting the engine?
YES: Go to Step 5.
NO: Check the generator (Refer to Generator - Disassembly and assembly - Inspection.)
STEP 5.
Q: Is an oscilloscope available?
YES: Go to Step 6.
NO: Go to Step 7.
STEP 6.
Q: Dose the oscilloscope show a normal wave pattern? (Refer to Charging system - Wave pattern check using a oscilloscope.)
YES: Go to Step 7.
NO: Check the generator. (Refer to Generator - Disassembly and assembly - Inspection.)
STEP 7.
- Engine: 2,500 r/min
- Headlight: ON (high beam)
- Check voltage between generator terminal B and the positive battery terminal
OK: 0.5 V or less
- Check voltage between the negative battery terminal and generator body
OK: 0.5 V or less
Q: Are the generator output line and ground line in good condition?
YES: Go to Step 8.
NO: Check the generator output line and ground line.
STEP 8.
Q: Is the output current normal? (Refer to Charging system - On vehicle service - Output current test.)
YES: Go to Step 9.
NO: Check the generator (Refer to Generator? Disassembly and assembly - Inspection.)
STEP 9.
Q: Is the regulated voltage normal? (Refer to Charging system - On vehicle service - Regulated voltage test.)
YES: Go to Step 10.
NO: Check the generator (Refer to Generator? Disassembly and assembly - Inspection.)
STEP 10.
Q: Is the voltage drop in the generator output line normal?
YES: Generator is normal. Check other systems.
NO: Check the output line.