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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 96 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0115, DTC P0117 & DTC P0118 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.

A thermistor built into engine coolant temperature sensor changes resistance value according to engine coolant temperature. Structure of sensor and connections to ECM is same as those of intake air temperature sensor. If DTCs P0115, P0117 or P0118 are 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 for .5 seconds. P0117 indicates a short in ECT sensor circuit for .5 seconds and P0118 indicates an open for .5 seconds. Possible causes are:

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