CUSTOMER CONCERN Customer states the check-engine light does not illuminate and the scan tool cannot communicate with the ECM. DTCs U0100-211, U0100-530 and U0100-784 are stored in the hybrid ECU. CAUSE Isolating ECM connector E83 terminal 125 restored the 5-volt VC circuit, confirming the fuel-pressure sensor was pulling down the reference circuit. CORRECTION Remove and replace fuel-pressure sensor. Restore VC circuit connection, clear communication DTCs and verify ECM commu

CUSTOMER CONCERN Customer states the engine will not idle after diagnostic codes were cleared. CAUSE Clearing adaptive memory exposed throttle-plate deposits and removed the learned idle correction values. CORRECTION Remove EFI and ETCS fuses for the specified reset period, clean throttle body and perform throttle-body idle relearn. Verify stable idle operation.

CUSTOMER CONCERN Customer states the brake and traction-control warning lights are on. DTCs C1203, C1336 and C1345 are stored. CAUSE The brake system had not completed linear-solenoid valve offset learning and acceleration-sensor zero-point calibration. CORRECTION Perform linear-solenoid valve offset relearn and acceleration-sensor zero-point calibration with a compatible scan tool. Clear brake-system DTCs.

CUSTOMER CONCERN Customer states the vehicle loses power and will not move. DTC P2797 with information code 865 is stored. CAUSE The code remained after replacement of the auxiliary oil-pump motor controller, and the confirmed failure was the transmission auxiliary oil pump. CORRECTION Remove and replace auxiliary transmission oil pump. Clear transmission DTCs.

CUSTOMER CONCERN Customer states hybrid-system warning lights are on and DTCs P0A80 and P3015 are stored. CAUSE Hybrid-battery stress testing showed battery block 5 dropping excessively under load, confirming deterioration inside the high-voltage battery pack. CORRECTION Remove and replace high-voltage battery pack. Clear hybrid-system DTCs.