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 MANUALSMITSUBISHI2004ECLIPSE L4-2.4L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSSENSORS AND SWITCHES - COMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORTESTING AND INSPECTION
2004 Mitsubishi Eclipse L4-2.4L SOHC
Throttle Position Sensor: Testing and Inspection
2004 Mitsubishi Eclipse L4-2.4L SOHCSECTION Testing and Inspection
THROTTLE POSITION SENSOR CHECK
Required Special Tool:
- MB991348: Test Harness Set
Checking the Terminal Resistance
1. Disconnect the throttle position sensor connector.
2. Measure resistance between the throttle position sensor side connector terminal No. 1 and terminal No. 4.
Standard value: 3.5 - 6.5 kOhms
3. Measure resistance between the throttle position sensor side connector terminal No. 1 and terminal No. 3.
4. If resistance is outside the standard value, or if it doesn't change smoothly, replace the throttle position sensor.
NOTE: After replacement, the throttle position sensor should be adjusted.
Check using oscilloscope
1. Disconnect the throttle position sensor connector and connect the test harness special tool (MB991348) in between.(All terminals should be connected.)
2. Connect the oscilloscope probe to the throttle position sensor side connector terminal No. 3.
3. Turn the ignition switch "ON" position.
4. Slowly move the throttle lever from the idle position to the full-throttle position and check then if the waveform is free from any noise.
5. If any noise is recognized, replace the throttle position sensor.
NOTE: After replacement, the throttle position sensor should be adjusted.
Required Special Tool:
- MB991348: Test Harness Set
Checking the Terminal Resistance
1. Disconnect the throttle position sensor connector.
2. Measure resistance between the throttle position sensor side connector terminal No. 1 and terminal No. 4.
Standard value: 3.5 - 6.5 kOhms
3. Measure resistance between the throttle position sensor side connector terminal No. 1 and terminal No. 3.
4. If resistance is outside the standard value, or if it doesn't change smoothly, replace the throttle position sensor.
NOTE: After replacement, the throttle position sensor should be adjusted.
Check using oscilloscope
1. Disconnect the throttle position sensor connector and connect the test harness special tool (MB991348) in between.(All terminals should be connected.)
2. Connect the oscilloscope probe to the throttle position sensor side connector terminal No. 3.
3. Turn the ignition switch "ON" position.
4. Slowly move the throttle lever from the idle position to the full-throttle position and check then if the waveform is free from any noise.
5. If any noise is recognized, replace the throttle position sensor.
NOTE: After replacement, the throttle position sensor should be adjusted.
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.