LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2012 >> M35h >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P014F >> DTC P0078, P0084: EVT Control Solenoid Valve >> DTC Logic >> DTC Detection Logic
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Detection Logic

DTC No. Trouble diagnosis name (Trouble diagnosis content) DTC detecting condition Possible cause
P0078 EX V/T ACT/CIRC-B1 [Exhaust valve timing control solenoid valve (bank 1) circuit] An improper voltage is sent to the ECM through exhaust valve timing control solenoid valve.
  • Harness or connectors (Exhaust valve timing control solenoid valve circuit is open or shorted.)
  • Exhaust valve timing control solenoid valve
P0084 EX V/T ACT/CIRC-B2 [Exhaust valve timing control solenoid valve (bank 2) circuit]