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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 105 (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 2003 Lexus RX 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 a fail-safe mode, in which engine coolant is assumed to be 176°F (80°C). DTC P0115 is set when ECM detects an open or short in ECT sensor circuit. Possible causes are:

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

NOTE: If DTCs P0110, P0115, P0120 and P1410 are output together, inspect ECM terminal E2 (ground) circuit for an open. Repair as necessary. See ENGINE PERFORMANCE in WIRING DIAGRAMS article in ELECTRICAL.
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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