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 DIAGNOSISSTARTING AND CHARGINGBATTERYTESTING AND INSPECTIONBATTERY TEST
2009 Mitsubishi Lancer L4-2.4L (4B12)
Battery Test
2009 Mitsubishi Lancer L4-2.4L (4B12)SECTION Battery Test
BATTERY TEST
BATTERY TESTING PROCEDURE
STEP 1. Check the battery cables.
Remove the negative cable, then the positive cable.
Check for dirty or corroded connections.
Q: Are the battery cables dirty or have corroded connections?
YES : Clean the battery cables. Then go to Step 2.
NO : Go to Step 2.
STEP 2. Check the battery post.
Check for loose battery post.
Q: Are the battery posts faulty?
YES : Replace the battery. Then go to Step 4.
NO : Go to Step 3.
STEP 3. Check the battery case.
1. Remove the hold-downs.
2. Check for broken/cracked case.
Q: Is the battery case faulty?
YES : Replace the battery. Then go to Step 4.
NO : Go to Step 4.
STEP 4. Check the open circuit voltage.
1. Turn headlights on for 15 seconds.
2. Turn headlights off for two minutes to allow battery positive voltage to stabilize.
3. Disconnect the battery cables.
4. Read open circuit voltage.
Q: Is open circuit voltage 12.4 volts or more?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Battery charging
Charge the battery. (See CHARGE RATE CHART)
Q: Is open circuit voltage 12.4 volts or more?
YES : Go to Step 6.
NO : Replace the battery.
STEP 6. Check the load test.
1. Connect a load tester to the battery.
2. Load the battery at the recommended discharge rate (See LOAD TEST RATE CHART) for 15 seconds.
3. Read voltage after 15 seconds, then remove load.
4. Compare the measured value with the minimum voltage. (See LOAD TEST CHART.)
Q: Is the voltage higher than minimum voltage?
YES : The battery is normal.
NO : Replace the battery.
Load Test Chart
Load Test Rate Chart
BATTERY TESTING PROCEDURE
STEP 1. Check the battery cables.
Remove the negative cable, then the positive cable.
Check for dirty or corroded connections.
Q: Are the battery cables dirty or have corroded connections?
YES : Clean the battery cables. Then go to Step 2.
NO : Go to Step 2.
STEP 2. Check the battery post.
Check for loose battery post.
Q: Are the battery posts faulty?
YES : Replace the battery. Then go to Step 4.
NO : Go to Step 3.
STEP 3. Check the battery case.
1. Remove the hold-downs.
2. Check for broken/cracked case.
Q: Is the battery case faulty?
YES : Replace the battery. Then go to Step 4.
NO : Go to Step 4.
STEP 4. Check the open circuit voltage.
1. Turn headlights on for 15 seconds.
2. Turn headlights off for two minutes to allow battery positive voltage to stabilize.
3. Disconnect the battery cables.
4. Read open circuit voltage.
Q: Is open circuit voltage 12.4 volts or more?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Battery charging
Charge the battery. (See CHARGE RATE CHART)
Q: Is open circuit voltage 12.4 volts or more?
YES : Go to Step 6.
NO : Replace the battery.
STEP 6. Check the load test.
1. Connect a load tester to the battery.
2. Load the battery at the recommended discharge rate (See LOAD TEST RATE CHART) for 15 seconds.
3. Read voltage after 15 seconds, then remove load.
4. Compare the measured value with the minimum voltage. (See LOAD TEST CHART.)
Q: Is the voltage higher than minimum voltage?
YES : The battery is normal.
NO : Replace the battery.
Load Test Chart
Load Test Rate Chart
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.