## Charging System

#### Charging Circuit Troubleshooting

4-21

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, refer to the 2001 Civic Shop Manual (see page 22-79) Charging system indicator Alternator and regulator circuit

Alternator control system

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, refer to the 2001 Civic Shop Manual (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, refer to the 2001 Civic Shop Manual (see step 8 on page 22-274).

5. Disconnect the engine wire harness 6P connector from the starter sub-harness 6P connector.

6. Measure the voltage at the No. 3 terminal of the engine wire harness 6P connector with the ignition switch ON (II).

ENGINE WIRE HARNESS 6P CONNECTOR

Wire side of female terminals

Is there battery voltage?

YES - Go to step 7.

NO - Check for a blown No.4 (10A) fuse in the under-dash fuse/relay box. 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 connector B (24P).
9. Check continuity between the ECM connector terminal B10 and engine wire harness 6P connector terminal No. 6.

ECM CONNECTOR B (24P)

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.

a a a