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 SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSINJECTOR CHECK
2009 Mitsubishi Lancer L4-2.4L (4B12)
Injector Check
2009 Mitsubishi Lancer L4-2.4L (4B12)SECTION Injector Check
INJECTOR CHECK
[Checking the Operation Sound]
Using a stethoscope or long blade screwdriver, check the operation
sound ("tick-tick-tick") of injectors during idling or during cranking. Check that as the engine speed increases, the frequency of the operating sound also increases.
1. If the injector you are checking is not operating, you may hear the operating sound of the other injectors.
2. If no operating sound is heard from the injector that is being checked, check the injector drive circuit. If there is nothing wrong with the circuit, a defective injector or ECM is suspected.
[Checking the Coil Resistance]
1. Disconnect the injector connector.
2. Measure the resistance between injector side connector terminals 1 and 2.
Standard value: 10.5 - 13.5 Ohms [at 20 °C (68 °F)]
3. Connect the injector connector.
[Checking the Operation Sound]
Using a stethoscope or long blade screwdriver, check the operation
sound ("tick-tick-tick") of injectors during idling or during cranking. Check that as the engine speed increases, the frequency of the operating sound also increases.
1. If the injector you are checking is not operating, you may hear the operating sound of the other injectors.
2. If no operating sound is heard from the injector that is being checked, check the injector drive circuit. If there is nothing wrong with the circuit, a defective injector or ECM is suspected.
[Checking the Coil Resistance]
1. Disconnect the injector connector.
2. Measure the resistance between injector side connector terminals 1 and 2.
Standard value: 10.5 - 13.5 Ohms [at 20 °C (68 °F)]
3. Connect the injector connector.
RENDER: 1.0x
NO RELATED
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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.