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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (Engine Control System (DTC/Circuit Diagnosis) (2 Of 5)) >> DTC/Circuit Diagnosis >> DTC P0128: Thermostat Function >> DTC Description >> DTC Detection Logic

DTC Detection Logic

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long enough.

This is due to a leak in the seal or the thermostat being stuck open.

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

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0128

THERMSTAT FNCTN

[Coolant thermostat (coolant temperature below thermostat regulating temperature)]

Diagnosis condition

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Signal (terminal)

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Threshold

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

Diagnosis delay time

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