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Home >> Mitsubishi >> 2004 >> Eclipse V6-3.0L SOHC >> Repair and Diagnosis >> Powertrain Management >> Fuel Delivery and Air Induction >> Fuel Injector >> Testing and Inspection >> Oscilloscope Check

Oscilloscope Check

INJECTOR




Required Special Tools:
- MB991348: Test Harness
- MD998464: Test Harness

Measurement Method






1. Disconnect the injector intermediate connector, and connect the test harness special tool (MD998464) in between.
2. Connect the oscilloscope probe to each injector intermediate connector terminal to analyze each cylinder:
- Terminal 2 (black clip of special tool) for the number 1 cylinder
- Terminal 3 (blue clip) for the number 3 cylinder
- Terminal 4 (white clip) for the number 5 cylinder


1. Disconnect the injector connector, and connect the test harness special tool (MB991348) in between. (All terminals should be connected.)
2. Connect the oscilloscope probe to injector connector terminal 2.

Alternate method (Test harness not available)
1. Connect the oscilloscope probe to ECM or PCM terminal 1. (When checking the number 1 cylinder.)
2. Connect the oscilloscope probe to ECM or PCM terminal 9. (When checking the number 2 cylinder.)
3. Connect the oscilloscope probe to ECM or PCM terminal 24. (When checking the number 3 cylinder.)
4. Connect the oscilloscope probe to ECM or PCM terminal 2. (When checking the number 4 cylinder.)
5. Connect the oscilloscope probe to ECM or PCM terminal 10. (When checking the number 5 cylinder.)
6. Connect the oscilloscope probe to ECM or PCM terminal 25. (When checking the number 6 cylinder.)







Standard Wave Pattern

Wave Pattern Observation Points




Point A: Height of injector coil induced voltage.




Point B: Injector drive time
1. The injector drive time should be synchronized with the scan tool tester display.
2. When the engine is suddenly revved, the drive time will be greatly extended at first, but the drive time will soon return to original length.
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