DIAGNOSIS SYSTEM DESCRIPTION The ECM controls the cruise control system of the vehicle. The data and DTCs relating to the cruise control system can be read from the DLC3 of the vehicle. Use the Techstream to check and solve the problem. HINT: If a vehicle speed sensor, stop light switch assembly or any other related part malfunctions, the ECM cancels control of vehicle speed automatically. (a) Check the battery voltage with the ignition switch off. Standard Voltage: 11 to 14 V (Ignition switch off) If the voltage is below 11 V, replace or recharge the battery before proceeding to the next step. (b) Check the DLC3. Click here CHECK INDICATOR (a) Turn the ignition switch ON. (b) Check that the cruise control indicator illuminates when the cruise control system is turned on using the cruise control main switch, and that the indicator goes out when the cruise control system is turned off using the cruise control main switch. If the results are not as specified, perform the Cruise Main Indicator Circuit inspection procedure. Click here 
HINT: While driving with the cruise control system controlling vehicle speed, the ECM will automatically cancel control of vehicle speed by the cruise control system when a malfunction occurs in one of the following: stop light switch assembly, or other related parts. When control of vehicle speed by the cruise control system is automatically canceled, the cruise control indicator turns off and a warning message is displayed. At the same time, a DTC is stored. |
Toyota Tundra Service Manual > Sfi System: Intake Air Temperature Circuit Low Input (P0112,P0113)
DESCRIPTION The Intake Air Temperature (IAT) sensor, mounted on the Mass Air Flow (MAF) meter, monitors the IAT. The IAT sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the IAT is low, the resistance of the thermistor increases. Whe ...
