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 EVOLUTION L4-2.0L DOHC TURBOREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - IGNITION SYSTEMIGNITION CONTROL MODULETESTING AND INSPECTION
2005 Mitsubishi Lancer Evolution L4-2.0L DOHC Turbo
Ignition Control Module: Testing and Inspection
2005 Mitsubishi Lancer Evolution L4-2.0L DOHC TurboSECTION Testing and Inspection
IGNITION COIL AND IGNITION POWER TRANSISTOR
Required Special Tool:
MB991348: Test Harness Set
Measurement Method
1. Disconnect the ignition coil connector and connect test harness special tool MB991348 in between. (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 the ECM terminal No.10 (for number 1 - number 4) terminal No.23 (for number 2 - number 3).
Standard Wave Pattern
Wave Pattern Observation Points
Point: Condition of wave pattern build-up section and maximum voltage (Refer to abnormal wave pattern examples 1 and 2).
Examples of Abnormal Wave Patterns
Example 1 (Wave pattern during engine cranking)
Cause of problem
- Open-circuit in ignition primary circuit
Wave pattern characteristics
- Top-right part of the build-up section cannot be seen and voltage value is approximately 2 volts too low.
Example 2 (Wave pattern during engine cranking)
Cause of problem
- Malfunction in ignition power transistor
Wave pattern characteristics
- Power voltage results when the ignition power transistor is ON.
Required Special Tool:
MB991348: Test Harness Set
Measurement Method
1. Disconnect the ignition coil connector and connect test harness special tool MB991348 in between. (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 the ECM terminal No.10 (for number 1 - number 4) terminal No.23 (for number 2 - number 3).
Standard Wave Pattern
Wave Pattern Observation Points
Point: Condition of wave pattern build-up section and maximum voltage (Refer to abnormal wave pattern examples 1 and 2).
Examples of Abnormal Wave Patterns
Example 1 (Wave pattern during engine cranking)
Cause of problem
- Open-circuit in ignition primary circuit
Wave pattern characteristics
- Top-right part of the build-up section cannot be seen and voltage value is approximately 2 volts too low.
Example 2 (Wave pattern during engine cranking)
Cause of problem
- Malfunction in ignition power transistor
Wave pattern characteristics
- Power voltage results when the ignition power transistor is ON.
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.