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Home >> Infiniti >> 2020 >> QX80 Luxe, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (5 Of 5) >> Engine (ECM) >> DTC P26AB: Multi-Way Control Valve >> DTC Description >> DTC Detection Logic
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DTC Detection Logic

NOTE: If DTC P26AB is displayed with DTC P0300, P0301, P0302, P0303 or P0304, first perform the trouble diagnosis for P0300, P0301, P0302, P0303, P0304. Refer to DTC Index .

Engine coolant temperature has not risen enough to open the multi-way control valve even though the engine has run long enough.

This is due to a leak in the seal or the multi-way control valve being stuck open.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P26AB

ENGINE COOLANT B/V POSI SEN

(Engine coolant bypass valve "A" stuck/open)

The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.

  • Multi-way control valve
  • Leakage from multi-way control valve
  • Engine coolant temperature sensor 1