![]() In testing procedures Alpha/Numeric character in patientness i.E. For circuit identification and wiring diagram, see WIRING DIAGRAMS. For connector identification, see CONNECTOR IDENTIFICATION. NOTE: For component location, see COMPONENT LOCATIONS. Do not put your hands near the pulleys, belts or fan. Possible Causes à Good Trip Equal To Zero à Low Coolant Level à Other Possible Causes à Signal Circuit Shorted To Battery Voltage à Thermostat Operation à Temperature Sensor Voltage Below 1.0 Volt à Signal Circuit Open à Sensor Ground Circuit Open à Signal Circuit Shorted To Ground à Signal Circuit Shorted To Sensor Ground à PCM Low à PCM High Testing WARNING: When the engine is operating, do not stand in a direct line with the fan. DTC will set if the two coolant temperature values are not within 18 F (10 C) of each other an error is detected. The PCM predicts a coolant temperature value that it will compare to the actual coolant temperature. The first code is a thermostat rationality code, here's the book info for that, the other coder are for small and gross leaks in the evap emmisions system, possibly the radiator cap, or a hose leak.ĭTC P0128: THERMOSTAT RATIONALITY Monitored & Set Conditions Thermostat Rationality is monitored with ignition on, engine running. ![]()
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