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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 MANAGEMENTIGNITION SYSTEMCAMSHAFT POSITION SENSORTESTING AND INSPECTION
2009 Mitsubishi Lancer L4-2.4L (4B12)
Camshaft Position Sensor: Testing and Inspection
2009 Mitsubishi Lancer L4-2.4L (4B12)SECTION Testing and Inspection
INSPECTION PROCEDURE USING AN OSCILLOSCOPE
INTAKE CAMSHAFT POSITION SENSOR AND CRANKSHAFT POSITION SENSOR
Required Special Tools:
- MB991709: Test Harness
- MB992110: Power Plant ECU Check Harness
Measurement Method
1. Disconnect the camshaft position sensor connector, and connect the test harness special tool (MB991709) between the separated connector (All terminals should be connected).
2. Connect the oscilloscope probe to intake camshaft position sensor connector terminal No. 3.
3. Disconnect the crankshaft position sensor connector, and connect the test harness special tool (MB991709) between the separated connector.
4. Connect the oscilloscope probe to crankshaft position sensor connector terminal No. 3.
Alternate method
1. Disconnect all ECM connectors. Connect the check harness special tool (MB992110) between the separated connectors.
2. Connect the oscilloscope to check harness terminal No. 14. (Check the camshaft position sensor signal wave pattern.)
3. Connect the oscilloscope to check harness terminal No. 8. (Check the crankshaft position sensor signal wave pattern.)
Wave Pattern Observation Points
1. Check that cycle time becomes shorter when the engine speed increased.
Examples of Abnormal Wave Patterns
Example 1
Cause of problem
- Sensor interface malfunction.
Wave pattern characteristics
- Rectangular wave pattern is output even when the engine is not started.
Example 2
Cause of problem
- Loose timing chain.
- Abnormality in sensor disc.
Wave pattern characteristics
- Wave pattern is displaced to the left or right.
INTAKE CAMSHAFT POSITION SENSOR AND CRANKSHAFT POSITION SENSOR
Required Special Tools:
- MB991709: Test Harness
- MB992110: Power Plant ECU Check Harness
Measurement Method
1. Disconnect the camshaft position sensor connector, and connect the test harness special tool (MB991709) between the separated connector (All terminals should be connected).
2. Connect the oscilloscope probe to intake camshaft position sensor connector terminal No. 3.
3. Disconnect the crankshaft position sensor connector, and connect the test harness special tool (MB991709) between the separated connector.
4. Connect the oscilloscope probe to crankshaft position sensor connector terminal No. 3.
Alternate method
1. Disconnect all ECM connectors. Connect the check harness special tool (MB992110) between the separated connectors.
2. Connect the oscilloscope to check harness terminal No. 14. (Check the camshaft position sensor signal wave pattern.)
3. Connect the oscilloscope to check harness terminal No. 8. (Check the crankshaft position sensor signal wave pattern.)
Wave Pattern Observation Points
1. Check that cycle time becomes shorter when the engine speed increased.
Examples of Abnormal Wave Patterns
Example 1
Cause of problem
- Sensor interface malfunction.
Wave pattern characteristics
- Rectangular wave pattern is output even when the engine is not started.
Example 2
Cause of problem
- Loose timing chain.
- Abnormality in sensor disc.
Wave pattern characteristics
- Wave pattern is displaced to the left or right.
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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.