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Home >> Lexus >> 2019 >> LS 500 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (03 Of 14) >> SFI System >> DTC P0115-15: Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open [12/2017 - ] >> Description

DTC P0115-15: Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open [12/2017 - ]: Description

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 ECM sets the engine coolant temperature judgment value (for outlet side) to 80°C (176°F) and the target engine coolant temperature to 82°C (180°F). Fail-safe mode continues until a pass condition is detected.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P0115-15 Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open The engine coolant temperature sensor (for outlet side) 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 DTC stored SAE: P0118

HINT: 

When a DTC is output, check the Data List item "Coolant Temperature Sensor1" using the Techstream.

Refer to DATA LIST / ACTIVE TEST [12/2017 - 09/2018] , or refer to DATA LIST / ACTIVE TEST [09/2018 - 09/2019] , or refer to DATA LIST / ACTIVE TEST [09/2019 - 10/2020] , or refer to DATA LIST / ACTIVE TEST [10/2020 - 10/2023] , or refer to DATA LIST / ACTIVE TEST [10/2023 - ]

DTC No. Coolant Temperature Sensor1 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 displays a normal value, the normal value may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.