S Terminal Circuit

S TERMINAL CIRCUIT

Description

The output voltage of the alternator is controlled by the IC voltage regulator at the "S" terminal detecting the input voltage.
The "S" terminal circuit detects the battery voltage to adjust the alternator output voltage with the IC voltage regulator.


Diagnosis Procedure


1. CHECK "S" TERMINAL CONNECTION

1.Turn ignition switch OFF.
2.Check if "S" terminal is clean and tight.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair "S" terminal connection. Confirm repair by performing complete Starting/Charging system test. Refer to Technical Service Bulletin.

2. CHECK "S" TERMINAL CIRCUIT

Check voltage between alternator harness connector and ground.





Is the inspection result normal?
YES- Work Flow.
NO- Check harness for open between alternator and fuse.