12 Volt Battery Internal Resistance Reset (With Auto Idle Stop System) (2020 2021): Procedure
NOTE:
- At every engine startup, the PCM updates and records the internal resistance of the 12 volt battery. When the average of past internal resistance (multiple memories) exceeds a threshold value, the PCM judges it as deterioration of the 12 volt battery.
- A 12 volt battery cancel or a PCM reset does not clear the recorded internal resistance values of the 12 volt battery in the PCM.
- The Idle Stop Inhibit (Battery Deterioration) can be checked by HDS.
- 12 Volt Battery Internal Resistance - Reset
1. Make sure all electrical items (the A/C, the audio, the lights, etc.) are off. 2. Turn the vehicle to the OFF (LOCK) mode.
3. Turn the vehicle to the ACCESSORY mode.
NOTE: The internal resistance of the 12 volt battery may not be updated if the engine starts up immediately from the OFF (LOCK) mode without going through the ACCESSORY mode and ON mode.
4. Turn the vehicle to the ON mode.
5. Start the engine, and let it idle for 1 minute or more.
6. Turn the vehicle to the OFF (LOCK) mode.
7. Repeat steps 3 through 6 four times or more.
8. Check if the auto idle system is operating properly according to the conditions listed in Auto Idle Stop System Inspection
If the system is not operating, go to the next step.
9. Connect the HDS to the data link connector
10. Select the PGM-FI system with the HDS.
11. Check the Idle Stop Inhibit (Battery Deterioration) in the Data ListS.
.NOTE:
- Normal: Reset is complete.
- INHIBITED: Replace the 12 volt battery , then do this 12 volt battery internal resistance reset procedure again.