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P0A1A-658, P0A1A-659, P0A1A-791 HBC-169 < COMPONENT DIAGNOSIS > D E F G H I J K L M A B HBC N O P P0A1A-658, P0A1A-659, P0A1A-791 Description INFOID:0000000004211816 The inverter with converter assembly (MG ECU) monitors its internal operation and detects malfunctions. DTC Logic INFOID:0000000004211817 DTC DETECTION LOGIC The MG ECU performs many diagnostic tests to verify proper operation of internal ECU systems. For one of these diagnostics, the MG ECU checks the result of the generator CPU self-test. If the MG ECU detects a “Fail” from the generator CPU self-test, it will conclude that there is an internal malfunction in the generator CPU. The hybrid vehicle control ECU will illuminate the MIL and set a DTC. Diagnosis Procedure INFOID:0000000004211818 1. PRECONDITIONING • Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system. • After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. • Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.ol Module >> GO TO 2. 2. REPLACE INVERTER WITH CONVERTER ASSEMBLY HBC-638, "Removal and Installation" >> COMPLETED DTC No. INF code Trouble diagnosis name DTC detecting condition Possible cause P0A1A 151 Generator Control Module Run pulse error Inverter with converter assembly 155 A/D error 156 ROM-RAM error 158 CPU recognition error 166 R/D converter NM stop error 658 ALU error 659 Communication error (from MG1 to MG2) 791 R/D converter communication error |