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 MANUALSMITSUBISHI2005LANCER L4-2.4L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - IGNITION SYSTEMIGNITION CONTROL MODULETESTING AND INSPECTION
2005 Mitsubishi Lancer L4-2.4L SOHC
Ignition Control Module: Testing and Inspection
2005 Mitsubishi Lancer L4-2.4L SOHCSECTION Testing and Inspection
IGNITION COIL AND IGNITION POWER TRANSISTOR
Required Special Tool:
- MB991658: Test Harness
Measurement Method
1. Disconnect the ignition coil connector and connect test harness special tool (MB991658) between the separated connector. (All terminals should be connected.)
2. Connect the oscilloscope probe to ignition coil connector terminal No.3.
Alternate method (Test harness not available)
1. Connect the oscilloscope probe to ECM or PCM terminal No.31. (When checking the number 1 cylinder.)
2. Connect the oscilloscope probe to ECM or PCM terminal No.32. (When checking the number 2 cylinder.)
3. Connect the oscilloscope probe to ECM or PCM terminal No.35. (When checking the number 3 cylinder.)
4. Connect the oscilloscope probe to ECM or PCM terminal No.52. (When checking the number 4 cylinder.)
Standard Wave Pattern
Wave Pattern Observation Points
Point: The power transistor control signal (ignition timing) is advanced when the engine speed is increased.
Examples of Abnormal Wave Patterns
Example 1 (Wave pattern during engine cranking)
- Cause of problem
Open-circuit in ignition primary circuit
- Wave pattern characteristics
Voltage value is too low.
Required Special Tool:
- MB991658: Test Harness
Measurement Method
1. Disconnect the ignition coil connector and connect test harness special tool (MB991658) between the separated connector. (All terminals should be connected.)
2. Connect the oscilloscope probe to ignition coil connector terminal No.3.
Alternate method (Test harness not available)
1. Connect the oscilloscope probe to ECM
2. Connect the oscilloscope probe to ECM
3. Connect the oscilloscope probe to ECM
4. Connect the oscilloscope probe to ECM
Standard Wave Pattern
Wave Pattern Observation Points
Point: The power transistor control signal (ignition timing) is advanced when the engine speed is increased.
Examples of Abnormal Wave Patterns
Example 1 (Wave pattern during engine cranking)
- Cause of problem
Open-circuit in ignition primary circuit
- Wave pattern characteristics
Voltage value is too low.
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.