## Charging System

#### Charging Circuit Troubleshooting

4-28

If the charging system indicator does not come on or does not go off, or the battery is dead or low, test the following items in the order listed below: Battery (see page 22-79) Charging system indicator Alternator and regulator circuit Alternator control system (KU, KT, KX, KK models)

Charging System Indicator Test

1. Turn the ignition switch ON (II).

Does the charging system indicator come on?

YES - Go to step 2.

NO - Go to step 3.

2. Start the engine.

Does the charging system indicator go off?

YES - Charging system indicator circuit is OK.

NO - Go to step 3.

3. Turn the ignition switch OFF.
4. Troubleshoot the multiplex control system (see page 22-273).

Is the multiplex control system OK?

YES - Go to step 5.

NO - Check the multiplex control system as indicated by the DTC (see page 22-273).

5. Disconnect the alternator 4P connector from the alternator.
6. Measure the voltage at the No. 1 terminal of the alternator 4P connector with the ignition switch ON (II).

ALTERNATOR 4P CONNECTOR

Wire side of female terminals

Is there battery voltage?

YES - Go to step 7.

NO - Check for a blown No. 4 (10A) fuse. If the fuse is OK, repair open in the wire between the alternator and the under-dash fuse/relay box.

7. Turn the ignition switch OFF
8. Disconnect ECM/PCM connector B (24P)
9. Check continuity between the ECM/PCM connector terminal B10 and alternator 4P connector terminal No. 3.

ECM/PCM CONNECTOR B (24P)

ALTERNATOR 4P CONNECTOR

Wire side of female terminals

Is there continuity?

YES - Go to step 10.

NO - Repair open in the wire between the alternator and the ECM/PCM.

10. Check continuity between the ECM/PCM connector terminal B10 and body ground.

ECM/PCM CONNECTOR B (24P)

Wire side of female terminals

Is there continuity?

YES - Repair short in the wire between the alternator and the ECM/PCM.

NO - Go to alternator and regulator test.