DESCRIPTION The ECM has a built-in internal temperature sensor which detects the internal temperature of the ECM. The resistance of the thermistor within the ECM internal temperature sensor changes according to the internal temperature of the ECM. The resistance of the thermistor increases as the ECM internal temperature decreases and decreases as the ECM internal temperature increases.
MONITOR DESCRIPTION The ECM calculates the internal temperature of the ECM based on the output voltage of the ECM internal temperature sensor. If the output voltage of the ECM internal temperature sensor is not within the normal operating range, the ECM will illuminate the MIL and store a DTC. In this case, the ECM internal temperature sensor may be malfunctioning or there may be an open or short in the sensor circuit. Example: When the output voltage of the ECM internal temperature sensor is less than 0.22 V, or higher than 4.91 V for 3 seconds or more, the ECM illuminates the MIL and stores a DTC. MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS P06AD: Range Check (Low Voltage)
CONFIRMATION DRIVING PATTERN HINT:
CAUTION / NOTICE / HINT NOTICE:
HINT: Read Freeze Frame Data using the Techstream. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred. PROCEDURE
(a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Clear the DTCs. Powertrain > Engine > Clear DTCs(e) Turn the power switch off and wait for at least 30 seconds.
(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. (b) Enter the following menus: Powertrain / Engine / Trouble Codes. (c) Read the DTCs. Powertrain > Engine > Trouble Codes
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Toyota Avalon Service & Repair Manual > Thermostat: Inspection
INSPECTION PROCEDURE 1. INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY (a) Check the valve opening. HINT: The valve opening temperature is inscribed on the water inlet with thermostat sub-assembly. (1) Add 15 cc (0.9 cu. in.) of water to the water inlet with thermostat sub-assembly from the inlet ...