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.
2003 Toyota Corolla LE, AutomaticFACTORY OEM SERVICE PROCEDURE
Service Data
Engine Control System Service Data Specification
| Throttle Idle Speed Control Valve Assy | |||
| Throttle Idle Speed Control Valve Movement | Ignition Switch ON | Half open --> fully close --> fully open --> half open | |
| Intake Aair Flow Meter Sub-Assy | |||
| Resistance | THA-E2 At -20°C (-4°F) | 13.6-18.4 K/Ohms | |
| Resistance | THA-E2 At 20°C (68°F) | 2.21-2.69 K/Ohms | |
| Resistance | THA-E2 At 60°C (140°F) | .49-.67 K/Ohms | |
| Camshaft Timing Oil Control Valve Assy | |||
| Resistance | At 20°C (68°F) | 6.9-7.9 K/Ohms | |
| E.F.I Throttle Position Sensor | |||
| Resistance | : VC-E2 | 2.5 - 6.0 K/Ohms | |
| E.F.I. Engine Coolant Temperature Sensor | |||
| Resistance | At 20°C (68°F) | 2.32 - 2.59 K/Ohms | |
| Resistance | At 80°C (176°F) | 0.310 - 0.326 K/Ohms | |
| Knock Control Sensor | |||
| Resistance | At 20°C (68°F) | 120-280 K/Ohms | |
| E.F.I. Circuit Opening Relay Assy. | |||
| Specified Condition | Between Terminals 1 and 2 | Continuity | |
| Specified Condition | Between Terminals 3 and 5 | No Continuity | |
| E.F.I. ECU Relay | |||
| Specified condition | Between Terminals 1 & 2 | Continuity | |
| Specified Condition | Between Terminals 3 & 5 | No Continuity | |
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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