Charging System Indicator Test

Turn the ignition switch ON (II).
Does the charging system indicator come on?
1. YES - Go to step 2.
2. NO - Go to step 3.
Start the engine.
Does the charging system indicator go off?
1. YES - Charging system indicator circuit is OK.
2. NO - Go to step 3.
Turn the ignition switch OFF.
Troubleshoot the multiplex control system (see TROUBLESHOOTING )
Is the multiplex control system OK?
1. YES - Go to step 5.
2. NO - Check the multiplex control system as indicated by the DTC (see TROUBLESHOOTING ).
Disconnect the alternator 4P connector from the alternator.
Measure the voltage at the No. 1 terminal of the alternator 4P connector with the ignition switch ON (II).

Fig 1: Measuring Voltage No. 1 Terminal Of Alternator 4-Pin Connector

Is there battery voltage?
1. YES - Go to step 7.
2. 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.
Turn the ignition switch OFF.
Disconnect ECM/PCM connector B (24P).
Check continuity between the ECM/PCM connector terminal B10 and alternator 4P connector terminal No. 3.

Fig 2: Checking Continuity Between ECM/PCM Connector Terminal B10 & Alternator 4-Pin Connector Terminal No. 3

Is there continuity?
1. YES - Go to step 10.
2. NO - Repair open in the wire between the alternator and the ECM/PCM.
Check continuity between the ECM/PCM connector terminal B10 and body ground.

Fig 3: Checking Continuity Between ECM/PCM Connector Terminal B10 & Body Ground

Is there continuity?
1. YES - Repair short in the wire between the alternator and the ECM/PCM.
2. NO - Go to alternator and regulator test.