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Home >> Infiniti >> 2017 >> QX80 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (1 Of 4) >> DTC/Circuit Diagnosis >> DTC P0078, P0084: EVT Control Solenoid Valve >> DTC Logic >> DTC Detection Logic

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]
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