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 MANUALSTOYOTA2007HIGHLANDER 2WD V6-3.3L (3MZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWPRECAUTION
2007 Toyota Highlander 2WD V6-3.3L (3MZ-FE)
Precaution
2007 Toyota Highlander 2WD V6-3.3L (3MZ-FE)SECTION Precaution
PRECAUTION
1. INITIALIZATION
NOTE:
- Perform RESET MEMORY (AT initialization) when replacing the automatic transaxle assembly, engine assembly or ECM.
- Perform REGISTRATION (VIN registration) when replacing the ECM. Engine Control System - SFI System
2. FOR USING INTELLIGENT TESTER
CAUTION:
Observe the following items for safety reasons:
- Before using the tester, read the instruction manual.
- Prevent the tester cable from being caught on the pedals, shift lever and steering wheel when driving with the tester connected to the vehicle.
- When driving the vehicle for testing purposes using the tester, two persons are required. One is for driving the vehicle, and the other operates the tester.
3. FOR USING BATTERY DURING INSPECTION
a. While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur.
1. INITIALIZATION
NOTE:
- Perform RESET MEMORY (AT initialization) when replacing the automatic transaxle assembly, engine assembly or ECM.
- Perform REGISTRATION (VIN registration) when replacing the ECM. Engine Control System - SFI System
2. FOR USING INTELLIGENT TESTER
CAUTION:
Observe the following items for safety reasons:
- Before using the tester, read the instruction manual.
- Prevent the tester cable from being caught on the pedals, shift lever and steering wheel when driving with the tester connected to the vehicle.
- When driving the vehicle for testing purposes using the tester, two persons are required. One is for driving the vehicle, and the other operates the tester.
3. FOR USING BATTERY DURING INSPECTION
a. While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur.
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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.