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Home >> Lexus >> 2025 >> NX 250 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 125 (Engine Control System - Diagnostic Codes (P0087-P012F)) >> SFI System >> DTC P0115-15: Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open [11/2021 - ] >> Description

DTC P0115-15: Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open [11/2021 - ]: Description

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Refer to DTC P0115-11.

Refer to DESCRIPTION 

HINT: 

When DTC P0115-15 is stored, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant temperature is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Note
P0115-15 Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open The engine coolant temperature sensor output voltage is higher than 4.91 V for 0.5 seconds or more (1 trip detection logic).
  • Open or short in engine coolant temperature sensor (for outlet side) circuit
  • Engine coolant temperature sensor (for outlet side)
  • ECM
Comes on SAE Code: P0118

HINT: 

When this DTC is output, check the engine coolant temperature in the Data List. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

DTC No. Coolant Temperature Malfunction
P0115-15 -40°C (-40°F)
  • Short to +B in THW circuit
  • Open in THW circuit
  • Open in ETHW circuit

If the Data List values is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.