Check OCV as follows.
a)Check resistance between terminals of OCV connector (1).
If measured resistance is out of specified range, replace OCV (2).
OCV resistance
6.7 to 7.7 Ω at 20 °C (68 °F)
b)Connect battery to OCV connector (1) as shown in figure, and check operating sound caused by movement of spool valve (2).
If check result is not as specified, replace OCV.