Troubleshooting Guide
CHARGING SYSTEM DIAGNOSISTROUBLESHOOTING GUIDE
The charging system troubleshooting guide is shown in the following steps.
STEP 1.
Q: Is the battery in good condition? (Refer to Chassis Electrical - Battery - On-vehicle Service - Battery Check Battery Check)
YES : Go to Step 2.
NO : Charge or replace the battery.
STEP 2.
Q: Is the generator drive belt in good condition?
YES : Go to Step 3.
NO : Adjust the belt tension or replace the belt.
STEP 3.
Q: Does the generator malfunction light come on when the ignition switch is turned on?
YES : Go to Step 4.
NO :
- Check the ignition switch. (Refer to Chassis Electrical - Ignition Switch - Ignition Switch Removal and Installation - Inspection Component Tests and General Diagnostics)
- Check the generator malfunction light and it's related circuits.
- Check the generator.
STEP 4.
Q: Does the generator malfunction light go out after starting the engine?
YES : Go to Step 5.
NO : Check the generator.
STEP 5.
Q: Is an oscilloscope available?
YES : Go to Step 6.
NO : Go to Step 7.
STEP 6.
Q: Does the oscilloscope show a normal wave pattern? (Refer to Charging System - On-vehicle Service - Wave Pattern Check Using an Oscilloscope Oscilloscope Patterns and Waveforms)
YES : Go to Step 7.
NO : Check the generator.
STEP 7.
- Engine: 2,500 r/min
- Headlight: ON (high beam)
- Voltage between generator terminal B and the positive battery terminal
OK: 0.5 V or less
- 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 Output Current Test)
YES : Go to Step 9.
NO : Check the generator.
STEP 9.
Q: Is the regulated voltage normal? (Refer to Charging System - On-vehicle Service - Regulated Voltage Test Regulated Voltage Test)
YES : Go to Step 10.
NO : Check the generator.
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.