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.
2004 Toyota Highlander Limited, FWDFACTORY OEM SERVICE PROCEDURE
Service Data: 2AZ-FE
Identifying Service Data - 2AZ-FE Engine Control System
| Throttle body | ||
| Standard throttle valve opening percentage | 60% or more | |
| Accelerator pedal position sensor | ||
| Standard voltage | 0.6 to 1.0 V | |
| Intake air flow meter assy | ||
| Resistance | 4 (THA) - 5 (E2) | |
| at -20°C (-4°F) | 13.6 to 18.4 kΩ | |
| at 20°C (68°F) | 2.21 to 2.69 kΩ | |
| at 60°C (140°F) | 0.493 to 0.667 kΩ | |
| Camshaft timing oil control valve assy | ||
| Resistance | at 20°C (68°F) | 6.9 to 7.9 Ω |
| Throttle body assy | ||
| Resistance | at 20°C (68°F) | |
| 2 (M+) - 1 (M-) | 0.3 to 100 kΩ | |
| E.F.I, engine coolant temperature sensor | ||
| Resistance | Approx. 20°C (68°F) | 2.32 to 2.59 kΩ |
| Approx. 80°C(176°F) | 0.310 to 0.326 kΩ | |
| Knock sensor | ||
| Resistance | at 20°C(68°F) | 120 to 280 kΩ |
| EFI relay | ||
| Specified condition | 3 - 5 | 10 kΩ or higher |
| 3 - 5 | Below 1 Ω (when battery voltage is applied to terminals 1 and 2) | |
| C/OPN relay | ||
| Specified condition | 3 - 5 | 10 kΩ or higher |
| 3 - 5 | Below 1 Ω (when battery voltage is applied to terminals 1 and 2) | |
Factory Service Tools
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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.
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