No spark from ignition?

Hi,

The ECM or PCM determines which ignition coil should be controlled by means of the signals from the camshaft position sensor which is incorporated in the camshaft and from the crankshaft position sensor which is incorporated in the crankshaft. It also detects the crankshaft position to provide ignition at the most appropriate timing in response to the engine operation conditions.

What I would start with is simply checking to make sure you are getting signals from both sensors I mentioned. If you have an oscilloscope, here are the directions for testing the cam sensor and crank sensor. The attached pics correlate with the directions.

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2007 Mitsubishi Eclipse L4-2.4L (4G69)
Oscilloscope Patterns and Wave-forms
Vehicle Power-train Management Sensors and Switches - Power-train Management Sensors and Switches - Computers and Control Systems Camshaft Position Sensor Testing and Inspection Oscilloscope Patterns and Wave-forms
OSCILLOSCOPE PATTERNS AND WAVE-FORMS
INSPECTION PROCEDURE USING AN OSCILLOSCOPE

CAMSHAFT POSITION SENSOR

pic 1

Required Special Tools:
- MB991709: Test Harness
- MB991658: Test Harness
- MB991923: Power Plant ECU Check Harness

Measurement Method
1. Disconnect the camshaft position sensor connector, and connect the test harness special tool (MB991709) between the separated connector (All terminals should be connected)
2. Connect the oscilloscope probe to camshaft position sensor connector terminal No. 2.

Pic 2

3. Disconnect the crankshaft position sensor intermediate connector, and connect the test harness special tool (MB991658) between the separated connector.
4. Connect the oscilloscope probe to crankshaft position sensor intermediate connector terminal No. 2.

Alternate method

pic 3

1. Disconnect all ECM connectors or PCM connectors. Connect the check harness special tool (MB991923) between the separated connectors.

Pic 4

2. Connect the oscilloscope to check harness terminal No. 104. (Check the camshaft position sensor signal wave pattern.)

pic 5

pic 6

3. Connect the oscilloscope to check harness terminal No. 103. (Check the crankshaft position sensor signal wave pattern.)

Wave Pattern Observation Points
1. Check that cycle time becomes shorter when the engine speed increased.

Examples of Abnormal Wave Patterns

pic 7

Example 1

Cause of problem
- Sensor interface malfunction.

Wave pattern characteristics
- Rectangular wave pattern is output even when the engine is not started.

Pic 8

Example 2

Cause of problem
- Loose timing belt.
- Abnormality in sensor disc.

Wave pattern characteristics
- Wave pattern is displaced to the left or right.

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Here are specific directions for testing the coil and power transistor.

2007 Mitsubishi Eclipse L4-2.4L (4G69)
Ignition Coil
Vehicle Power-train Management Ignition System Testing and Inspection Component Tests and General Diagnostics Ignition Coil
IGNITION COIL
IGNITION COIL CHECK
Check by the following procedure, and replace the coil if there is a malfunction.

PRIMARY COIL AND IGNITION POWER TRANSISTOR CONTINUITY CHECK

NOTE: An analog-type ohmmeter should be used.

NOTE: Connect the negative probe of the ohmmeter to terminal 1.

CAUTION: This test must be performed quickly (in less than 10 seconds) to prevent coil from burning and ignition power transistor from breaking.

Pic 9

1. Connect and disconnect 4.5 - 9.0 V battery between terminal No. 2 and No. 3, and observe the ohmmeter whether there is continuity or not.

Pic 10

2. If results do not agree with the table, replace the primary coil and ignition power transistor assembly.

SECONDARY COIL CHECK

NOTE: It is impossible to check the secondary coil through the continuity check as a diode is integrated in the secondary coil circuit of this ignition coil. Accordingly, check the secondary coil in the following procedure.

1. Disconnect the ignition coil connector.
2. Remove the ignition coil and install a new spark plug to the ignition coil.
3. Connect the ignition coil connector.
4. Ground the side electrode of the spark plug and crank the engine.
5. Check that spark is produced between the electrodes of the spark plug.
6. If no spark plug is produced, replace the ignition coil with a new one and recheck.
7. If spark is produced with the new ignition coil, replace the old one as it is faulty. If no spark is produced again, the ignition circuit is suspected as faulty. Check the ignition circuit.

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I noted you are looking for connector info related to the ECM. My manual shows a five connector ECM. The last pics are related to and the 5 connector. It shows terminal voltages.

2007 Mitsubishi Eclipse L4-2.4L (4G69)
Terminal Voltage Check
Vehicle Power-train Management Relays and Modules - Power-train Management Relays and Modules - Computers and Control Systems Engine Control Module Testing and Inspection Pinout Values and Diagnostic Parameters Terminal Voltage Check
TERMINAL VOLTAGE CHECK
CHECK AT THE ENGINE CONTROL MODULE (ECU) OR THE POWER-TRAIN CONTROL MODULE (PCM)

1. Disconnect the ECM or the PCM connectors B-18, B-19, B-20, B-21 and B-22, and connect check harness special tool MB991923 between the ECM connectors or the PCM connectors.
2. Measure the voltage between each check harness connector terminal and check harness connector ground terminal (No. 25 or No. 29).

Check Harness Special Tool MB991923 Connector Terminal Arrangement Part 1

Pic 11

Check Harness Special Tool MB991923 Connector Terminal Arrangement Part 2

pic 12

Check Harness Special Tool MB991923 Connector Terminal Arrangement Part 3

pic 13

Check Harness Special Tool MB991923 Connector Terminal Arrangement Part 4

pic 14

Check Harness Special Tool MB991923 Connector Terminal Arrangement Part 5

pic 15

Check Harness Special Tool MB991923 Connector Terminal Arrangement Part 6

pic16

Check Harness Special Tool MB991923 Connector Terminal Arrangement Part 7
pic 17

TERMINAL VOLTAGE CHECK CHART

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Pic 18 shows the ECM I have in the manual.

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I hope something here is helpful. Let me know what you find or if you have other questions.

Take care,
Joe

Copper foils are usually radio antenna wires, how is the reception? Can you scan for codes? These guides can help us fix it

https://www.2carpros.com/articles/how-to-test-an-ignition-system

and

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down these guides and report back.

If thats now fixed, injectors are working?

What you need to make sure of is that the Crank sensor is still good, and the wiring from it to the PCM is now good, if either is faulty, the PCM gets no signal, and you will not get spark. Note the wire colors at the sensor, find them at the PCM and check ohms, you want to see under 5 ohms on each wire, if over that, find the point they are touching bare metal.

Yes if your testing close to the PCM, to check the sensor just unplug it and meter the sensor terminals while cranking.

If it has spark at the plugs, crank sensor is OK, if it's no fuel at injectors, no injector pulse, it's the cam sensor, check that.

Have the vehicle's computer scanned for fault codes (check engine or service engine soon). If there are no codes then it will be a lot more difficult to diagnose. Lets start here and get back to me.

Hello,

This sounds like the MFI relay is not working here is a guide to help you confirm and the location of the relay below.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.

Hi,

Have you verified the fuel pump relay? Clearly the PCM is not energizing the injectors because if you don't have power to them they share a power feed with a number of other components. Please see the attached diagrams.

Let me know if the relay checks out and we can move on. However, if this is no good then the PCM will not energize the injectors so we need to eliminate it. Thanks