Car will not start

Tiny
TSIRWA
  • MEMBER
  • 2006 MITSUBISHI LANCER
  • 1.5L
  • 4 CYL
  • AUTOMATIC
  • 5,642 MILES
Car cranks okay. I have continuous power at 2 terminals of coil connector the other is ground. Please help
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Tuesday, August 13th, 2019 AT 5:30 AM

9 Replies

Tiny
JOE F
  • EXPERT
Welcome to 2CarPros.

Have you checked to see if the engine is getting spark and fuel? Even though you have power to the coil, if there is no trigger, the plugs will not get power to ignite the fuel. Most commonly is there is no spark as a result of a bad crankshaft position sensor. Take a look through these links:

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

Take a look through these links:

https://www.2carpros.com/articles/car-cranks-but-wont-start

Let me know. If you find there is no spark, the aforementioned sensor is my first suspect. You indicated above it is a 1.5L, but my book only indicates a 2.0 and 2.4L available. Let me know exactly which you have.

Take care,

Joe
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Tuesday, April 20th, 2021 AT 11:41 AM
Tiny
TSIRWA
  • MEMBER
Thanks for your reply Jacob. Sorry its a 2.0L now the crank sensor seems to be okay. My worry is, does it have to output 12v continuous at both trigger and supply? Send me the circuit if possible.
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Tuesday, April 20th, 2021 AT 11:41 AM
Tiny
JOE F
  • EXPERT
Welcome back:

To test the crank and cam sensors requires an oscilloscope. Here are the directions for both. And no to the 12v. There will be a low voltage supply to the sensor, a ground, and an output.

___________________________________

2006 Mitsubishi Lancer L4-2.0L SOHC
Oscilloscope Check
Vehicle Powertrain Management Sensors and Switches - Powertrain Management Sensors and Switches - Computers and Control Systems Crankshaft Position Sensor Testing and Inspection Component Tests and General Diagnostics Oscilloscope Check
OSCILLOSCOPE CHECK
CAMSHAFT POSITION SENSOR AND CRANKSHAFT POSITION SENSOR

Required Special Tools:
MB991709: Test Harness Set
MB991658: Test Harness Set

Measurement Method

1. Disconnect the camshaft position sensor connector, and connect the test harness special tool (MB991709) in between. (All terminals should be connected.)

pic 1

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 (MB991658) in between. (All terminals should be connected.)

pic 2
4. Connect the oscilloscope probe to crankshaft position sensor connector terminal No. 3.

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.)

pic 3

pic4

Standard Wave Pattern

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

Examples of Abnormal Wave Patterns

pic 5

Example 1

Cause of problem
- Sensor interface malfunction.

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

Pic 6

Example 2

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

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

____________________________

I attached 3 pics below. They are of the ignition / fuel systems. I had to break it into 3 pics so you could read them. I did overlap them so you could follow.

Let me know if that helps.

Take care,
Joe
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Tuesday, April 20th, 2021 AT 11:41 AM
Tiny
TSIRWA
  • MEMBER
Thank you Joe, sorry for the late replies I was recollecting all the test tools together now all the sensors (cam and crank). Seem okay as per your description but the car wont start could it be the ECU?In the passenger compartment or the front ECU. Please advice. Can I get a copy of your book please?
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Tuesday, April 20th, 2021 AT 11:41 AM
Tiny
JOE F
  • EXPERT
Welcome back:

The manuals we use are online and owned by the companies I indicated. We have to pay for them, but if you are interested, I will try to get info for you.

Are you certain there is no spark to the plugs? Also, what happens if you try to start it using starting fluid?

Let me know.

Joe
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Tuesday, April 20th, 2021 AT 11:41 AM
Tiny
TSIRWA
  • MEMBER
Hi, I am much interested in more information sir. Now today I found the control unit had two blown diodes one with a value of 180. So I want to chase for another unit and try out.
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Tuesday, April 20th, 2021 AT 11:41 AM
Tiny
JOE F
  • EXPERT
Welcome back:

When you say control unit/diodes, which part are you specifically referring to? Also, please let me know what you need so I can get it for you.

Take care,
Joe
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Tuesday, April 20th, 2021 AT 11:41 AM
Tiny
TSIRWA
  • MEMBER
Hi, sorry for late replies I am referring to the engine control unit found in the pass compartment.
Thanks,
Tsirwa
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Tuesday, April 20th, 2021 AT 11:41 AM
Tiny
JOE F
  • EXPERT
Welcome back:

The last time we spoke, you were getting a different ECU to try. Have you done that? If so, what were the results?

Let me know if you need anything. Also, if you have further questions, let me know if this is a 2.0L or the 2.4L.

Take care,
Joe
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Tuesday, April 20th, 2021 AT 11:41 AM

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