Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2004TUNDRA 4WD V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESACTIVE TEST
2004 Toyota Tundra 4WD V8-4.7L (2UZ-FE)
Active Test
2004 Toyota Tundra 4WD V8-4.7L (2UZ-FE)SECTION Active Test
ACTIVE TEST
HINT: Performing the ACTIVE TEST using the hand-held tester or the OBD II scan tool allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one method to shorten diagnostic time.
It is possible to display the DATA LIST during the ACTIVE TEST.
a. Warm up the engine.
b. Turn the ignition switch OFF.
c. Connect the hand-held tester or the OBD II scan tool to the DLC3.
d. Turn the ignition switch ON.
e. Push the "ON" button of the hand-held tester or the OBD II scan tool.
f. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST.
g. According to the display on tester, perform the "ACTIVE TEST".
HINT: Performing the ACTIVE TEST using the hand-held tester or the OBD II scan tool allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one method to shorten diagnostic time.
It is possible to display the DATA LIST during the ACTIVE TEST.
Part 1:
Part 2:
a. Warm up the engine.
b. Turn the ignition switch OFF.
c. Connect the hand-held tester or the OBD II scan tool to the DLC3.
d. Turn the ignition switch ON.
e. Push the "ON" button of the hand-held tester or the OBD II scan tool.
f. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST.
g. According to the display on tester, perform the "ACTIVE TEST".
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.