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With GST

Start engine and let it idle.
Check voltage between ECM terminal 71 (battery current sensor signal) and ground for 10 seconds.

Fig 1: Checking Voltage Between ECM Terminal 71 (Battery Current Sensor Signal) And Ground
Courtesy of SUZUKI OF AMERICA CORP.

The voltage should be above 2.3V at least once.
If NG, go to [P1554 BATTERY CURRENT SENSOR ].