Initial Inspection and Diagnostic Overview

CHARGING SYSTEM DIAGNOSIS

TROUBLESHOOTING HINTS
Generator malfunction light does not go on when the ignition switch is turned to ON, before the engine starts.
^ Check the generator malfunction light.

Generator malfunction light does not switch off after the engine starts.
^ Check the IC voltage regulator inside the generator.

Discharged or overcharged battery.
^ Check the IC voltage regulator inside the generator.

TROUBLESHOOTING GUIDE
The charging system troubleshooting guide is shown in the following steps.

STEP 1.
Q: Is the battery in good condition?
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.
Check the generator malfunction light and its 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?
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?
YES: Go to Step 9.
NO: Check the generator.

STEP 9.
Q: Is the regulated voltage normal?
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.