P1115 – Engine Coolant Temperature Sensor Circuit (Nissan)

Description

The ECM detected an electrical malfunction in the engine coolant temperature sensor circuit.

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Symptoms

Hard starting
Poor fuel economy
Rough idle
High idle
Check engine light

Causes

Faulty ECT sensor
Open or shorted wiring
Connector corrosion
ECM driver fault

Diagnosis

Test sensor resistance
Inspect wiring
Check connectors
Scan live data

Repair

Replace ECT sensor
Repair wiring
Clean connectors