LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2008 >> Altima Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Control System (Hybrid)) >> Component Diagnosis >> U0400, U1021 Can Comm Data >> DTC Logic >> DTC Detection Logic
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Detection Logic

WARNING: This page is about a different variant/trim than selected.
DTC DETECTING CONDITION AND POSSIBLE CAUSE

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
U0400 Invalid data received from hybrid vehicle control ECU SUM data on CAN signal of OBD (emission related diagnosis) from HV ECU is different from SUM data calculated by ECM.
  • Harness or connectors

    (HEV SYSTEM CAN communication line is open or shorted)

  • ECM
  • HV ECU
U1021 SUM data on CAN signal other than OBD (emission related diagnosis) from HV ECU is different from SUM data calculated by ECM.
scientia non olet · About LEMON Manuals