Safety Warning
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HOMESERVICE MANUALSMITSUBISHI2004GALANT V6-3.8L (6G75)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMRELAYS AND MODULES - IGNITION SYSTEMIGNITION CONTROL MODULETESTING AND INSPECTION
2004 Mitsubishi Galant V6-3.8L (6G75)
Ignition Control Module: Testing and Inspection
2004 Mitsubishi Galant V6-3.8L (6G75)SECTION Testing and Inspection
IGNITION COIL AND IGNITION POWER TRANSISTOR
Required Special Tools:
- MB991658: Test Harness
- MB991923: Power Plant ECU Check Harness
Measurement Method
1. Disconnect the intermediate connector B-32, and connect the test harness special tool (MB991658) between the separated connector.
2. Connect the oscilloscope probe to each intermediate connector B-32 terminal to analyze each cylinder:
- Terminal No. 2 for the number 1 cylinder.
- Terminal No. 7 for the number 3 cylinder.
- Terminal No. 3 for the number 5 cylinder.
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 (Measure at the PCM)
1. Disconnect the all PCM connectors, and connect check harness special tool (MB991923) between the separated connectors.
2. Connect the oscilloscope probe to each check harness connector terminal to analyze each cylinder:
- Terminal No. 151 for the number 1 cylinder.
- Terminal No. 150 for the number 2 cylinder.
- Terminal No. 144 for the number 3 cylinder.
- Terminal No. 148 for the number 4 cylinder.
- Terminal No. 143 for the number 5 cylinder.
- Terminal No. 134 for the number 6 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 Tools:
- MB991658: Test Harness
- MB991923: Power Plant ECU Check Harness
Measurement Method
1. Disconnect the intermediate connector B-32, and connect the test harness special tool (MB991658) between the separated connector.
2. Connect the oscilloscope probe to each intermediate connector B-32 terminal to analyze each cylinder:
- Terminal No. 2 for the number 1 cylinder.
- Terminal No. 7 for the number 3 cylinder.
- Terminal No. 3 for the number 5 cylinder.
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 (Measure at the PCM)
1. Disconnect the all PCM connectors, and connect check harness special tool (MB991923) between the separated connectors.
2. Connect the oscilloscope probe to each check harness connector terminal to analyze each cylinder:
- Terminal No. 151 for the number 1 cylinder.
- Terminal No. 150 for the number 2 cylinder.
- Terminal No. 144 for the number 3 cylinder.
- Terminal No. 148 for the number 4 cylinder.
- Terminal No. 143 for the number 5 cylinder.
- Terminal No. 134 for the number 6 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.
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.