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 Charging system test using
EXP-800 NI or GR8-1200 NI (if available). Refer to the applicable Instruction Manual for proper testing procedures.

2. CHECK "S" TERMINAL CIRCUIT

Check voltage between alternator harness connector and ground.





Is the inspection result normal?
YES- Refer to "Work Flow (With EXP-800 NI or GR8-1200 NI)" With EXP-800 NI or GR8-1200 NI or "Work Flow (Without
EXP-800 NI or GR8-1200 NI)".
NO- Check harness for open between alternator and fuse.