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1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128) a. Connect the Techstream to the DLC3. b. Turn the ignition switch to ON. c. Turn the Techstream ON. d. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes. e. Read DTCs. Result RESULT REFERENCE HINT: If any DTCs other than P0128 are output, troubleshoot those DTCs first. B : GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART ) A : Go To Next Step 2. CHECK COOLING SYSTEM a. Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications. NG : REPAIR OR REPLACE COOLING SYSTEM OK : Go To Next Step 3. INSPECT THERMOSTAT a. Remove the thermostat. (See REMOVAL ). b. Measure the valve opening temperature of the thermostat. Standard opening temperature: 80 to 84°C (176 to 183°F) HINT: In addition to the above check, confirm that the valve is completely closed when the temperature is c. Reinstall the thermostat. (See INSTALLATION ). Result Proceed To P0128 is output A P0128 and other DTCs are output B
2008 Toyota Tundra 2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra
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