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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 35 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0115: ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUITCIRCUIT DESCRIPTION
2004 Toyota Matrix XR, FWD, Standard

Circuit Description

2004 Toyota Matrix XR, FWD, StandardSECTION Circuit Description
WARNING: This page is about a different car, the 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

The ECT sensor is a thermistor that monitors coolant temperature. If DTC P0115 is set, ECM will operate in fail-safe mode (engine coolant temperature is fixed at 176°F (80°C)). DTC is set when ECM detects an open or short in ECT circuit. Possible causes are:

  • Open or short in ECT sensor circuit.
  • Faulty ECT sensor.
  • Faulty ECM.

NOTE: If DTCs P0110, P0115, P0120, P0450 and P1120 are output together, inspect ECM terminal E2 (ground) circuit for an open. Repair as necessary. See WIRING DIAGRAMS article.
RENDER: 1.0x

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