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 MANUALSMITSUBISHI2009LANCER L4-2.4L (4B12)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSELECTRONIC THROTTLE ACTUATORTESTING AND INSPECTION
2009 Mitsubishi Lancer L4-2.4L (4B12)
Electronic Throttle Actuator: Testing and Inspection
2009 Mitsubishi Lancer L4-2.4L (4B12)SECTION Testing and Inspection
THROTTLE ACTUATOR CONTROL MOTOR CHECK
[Operation Inspection]
1. Disconnect the air intake hose from the throttle body.
2. Turn the ignition switch to the "ON" position.
3. Operate the accelerator pedal and confirm that the throttle valve is opening and closing accordingly.
[Checking the Terminal Resistance]
1. Disconnect the throttle position sensor connector.
2. Measure the resistance between terminal No. 1 and No. 2.
Standard value: 0.3 - 80 Ohms[at 20 °C (68 °F)]
NOTE: If the measured resistance deviates from the standard value, fully open the throttle valve with your finger more than five times, then check the result again. If the throttle actuator control motor is not used for an extended period of time, the resistance may be increased as a result of internal forming of oxide film. Therefore, it means that the oxide film can be removed through a self cleaning capability of the throttle valve control servo, if forcibly moved.
3. If resistance is outside the standard value, replace the throttle body assembly.
[Operation Inspection]
1. Disconnect the air intake hose from the throttle body.
2. Turn the ignition switch to the "ON" position.
3. Operate the accelerator pedal and confirm that the throttle valve is opening and closing accordingly.
[Checking the Terminal Resistance]
1. Disconnect the throttle position sensor connector.
2. Measure the resistance between terminal No. 1 and No. 2.
Standard value: 0.3 - 80 Ohms[at 20 °C (68 °F)]
NOTE: If the measured resistance deviates from the standard value, fully open the throttle valve with your finger more than five times, then check the result again. If the throttle actuator control motor is not used for an extended period of time, the resistance may be increased as a result of internal forming of oxide film. Therefore, it means that the oxide film can be removed through a self cleaning capability of the throttle valve control servo, if forcibly moved.
3. If resistance is outside the standard value, replace the throttle body assembly.
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.