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HOMESERVICE MANUALSMITSUBISHI2004ECLIPSE L4-2.4L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMCRANKSHAFT POSITION SENSORTESTING AND INSPECTION
2004 Mitsubishi Eclipse L4-2.4L SOHC
Crankshaft Position Sensor: Testing and Inspection
2004 Mitsubishi Eclipse L4-2.4L SOHCSECTION Testing and Inspection
CAMSHAFT POSITION SENSOR AND CRANKSHAFT POSITION SENSOR
Required Special Tools:
- MB991709: Test Harness Set
- MD998478: Test Harness
Measurement Method
1. Disconnect the camshaft position sensor connector, and connect the test harness special tool (MB991709) in between. (All terminals should be connected.)
2. Connect the oscilloscope probe to camshaft position sensor connector terminal No. 2.
3. Disconnect the crankshaft position sensor connector, and connect the test harness special tool (MD998478) in between.
4. Connect the oscilloscope probe to crankshaft position sensor connector terminal No. 2 (black clip of special tool).
Alternate method (Test harness not available)
1. Connect the oscilloscope probe to ECM terminal No. 88. (Check the camshaft position sensor signal wave pattern.)
2. Connect the oscilloscope probe to ECM terminal No. 89. (Check the crankshaft position sensor signal wave pattern.)
1. Connect the oscilloscope probe to PCM terminal No. 56. (Check the camshaft position sensor signal wave pattern.)
2. Connect the oscilloscope probe to PCM terminal No. 45. (Check the crankshaft position sensor signal wave pattern.)
Standard Wave Pattern
Wave Pattern Observation Points
Check that cycle time T 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 belt.
Abnormality in sensor disc.
- Wave pattern characteristics
Wave pattern is displaced to the left or right.
Required Special Tools:
- MB991709: Test Harness Set
- MD998478: Test Harness
Measurement Method
1. Disconnect the camshaft position sensor connector, and connect the test harness special tool (MB991709) in between. (All terminals should be connected.)
2. Connect the oscilloscope probe to camshaft position sensor connector terminal No. 2.
3. Disconnect the crankshaft position sensor connector, and connect the test harness special tool (MD998478) in between.
4. Connect the oscilloscope probe to crankshaft position sensor connector terminal No. 2 (black clip of special tool).
Alternate method (Test harness not available)
1. Connect the oscilloscope probe to ECM terminal No. 88. (Check the camshaft position sensor signal wave pattern.)
2. Connect the oscilloscope probe to ECM terminal No. 89. (Check the crankshaft position sensor signal wave pattern.)
1. Connect the oscilloscope probe to PCM terminal No. 56. (Check the camshaft position sensor signal wave pattern.)
2. Connect the oscilloscope probe to PCM terminal No. 45. (Check the crankshaft position sensor signal wave pattern.)
Standard Wave Pattern
Wave Pattern Observation Points
Check that cycle time T 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 belt.
Abnormality in sensor disc.
- Wave pattern characteristics
Wave pattern is displaced to the left or right.
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.