(1) Disconnect the PHEV-ECU connector (B508), and measure at the wiring harness side.
(2) Check the continuity between the PHEV-ECU connector (CCLG terminal) and body ground.
OK: Continuity exists (2 Ω or less)
Is the check result normal?
Repair the connector(s) or wiring harness in CCLG line between the PHEV-ECU connector and body ground.