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Thread: Massive misfire cylinder 1 -- SOLVED (wire corrosion)

  1. #31
    Senior Member Rkt Ship's Avatar
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    Quote Originally Posted by MightyMirageMpg View Post
    Rkt ide definitely hold off on shelling coin for an ECU before you do some more testing

    Does anyone know if you can just swap ECU's without having any calibrations or anything done?

    If you need someone to double check some funny readings or whatever post what you need done and I'm sure someone will help. Unfortunately someone stole my good meter (its like a war zone in milwaukee) and i don't trust the harbor freight jobby around my ECM. Lol

    Does the car start and run on 2cyl? There's a few things you should look at like the commanded timing value and the 02 sensor bank 1 voltage.

    A stuck shut EXHAUST valve will still allow you to read good compression but obviously the engine would appear to be missing, even though it's actually not. Your 02 wouldn't read lean or rich because it's reading the working 2 cylinders.

    I would also (as foama and eggman suggested) pay particular attention too the wiring connections.

    Where did you have your negative test lead when you were reading the 2.5vdc? The battery or just a random ground?

    The HERTZ test will obviously rule definitively if the ECM is firing the injector but not necessarily WHY it's not firing it. I do believe that the hertz test is polarity sensitive, also.

    Maybe a local could meet up and just swap ecu real quick. Ide hate to see you waste $
    The thing is I followed the FSM and with everything else they listed being ruled out its the ECM. ID liek to swap a computer out to see if it fixes the problem beforehand but finding someone to swap with will be the problem.



  2. #32
    Senior Member Rkt Ship's Avatar
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    Quote Originally Posted by Eggman View Post
    1. I'm pretty sure a new ECU will require programming (think VIN & odometer.)
    2. I'm somewhat nearby and will offer any assistance needed.
    Im going to call mitsu and see if you can just swap ecus or find out what needs done for the swap. If the car willl run with just swapping. Could I possibly borrow yours since you have a 2015 manual and they are the "same"?

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    Senior Member Rkt Ship's Avatar
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    Quote Originally Posted by Top_Fuel View Post
    Well...keep in mind that's not the ideal way to tell if you've got good spark on a cylinder. It doesn't take much voltage to jump a plug gap. Something like a spark tester will give you a better idea on what kind of voltage a coil is making. I hope one of my automotive instructors is reading this. I really was paying attention in class...




    Here's a good video that demonstrates it on an engine with a misfire...

    aww I want one of those

  4. #34
    Senior Member MightyMirageMpg's Avatar
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    Quote Originally Posted by Rkt Ship View Post
    The thing is I followed the FSM and with everything else they listed being ruled out its the ECM.
    Hard to argue with that.

  5. #35
    Quote Originally Posted by Rkt Ship View Post
    The thing is I followed the FSM and with everything else they listed being ruled out its the ECM. ID liek to swap a computer out to see if it fixes the problem beforehand but finding someone to swap with will be the problem.
    Were you able to find out if you can swap ecm's without programing? I haven't had a chance to try yet.
    Mirage videos:

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)


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    Senior Member Rkt Ship's Avatar
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    Quote Originally Posted by Fummins View Post
    Were you able to find out if you can swap ecm's without programing? I haven't had a chance to try yet.
    You cannot. I cant find my mini vci either. Im a little annoyed that I cant find it. Im even considering buying a mut3 just to make it easier on myself. Im gonna keep this car until it falls apart. The parts are so cheap with no miles on them.

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    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by Rkt Ship View Post
    You cannot...
    That's a bummer. Did someone tell you why it won't work?

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)


  9. #38
    Senior Member Rkt Ship's Avatar
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    Quote Originally Posted by Top_Fuel View Post
    That's a bummer. Did someone tell you why it won't work?
    The etacs and the ecm wont talk to eachother unless the Vin number matches. So I need to change the vin number in the ecu to match the etacs. There may be something with the key but I will cross that bridge when I get to it

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  11. #39
    Senior Member Rkt Ship's Avatar
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    Im going to try and use my bluetooth obd device to connect. I still cannot find my j2354 so Im gonna work this way. If it doesn't work Im gonna get an MUT 3 tool. Ill let you guys know how this goes./

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    Moderator Eggman's Avatar
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    Here's some info from the service manual.

    Interestingly, page 44 suggests checking the fuel supply while page 244 focuses on ignition.

    Quote Originally Posted by Mitsubishi Mirage Service Manual section 13A MULTIPORT FUEL INJECTION (MFI)

    13A-44
    DTC DIAGNOSTIC ITEM FAIL-SAFE AND BACKUP FUNCTION

    P0301 Cylinder 1 misfire detected The supply of fuel to the misfiring cylinder can possibly be cut.




    13A-244
    DTC P0301: cylinder 1 misfire detected



    TECHNICAL DESCRIPTION
    •If a misfire occurs while the engine is running, the engine speed changes for an instant.
    •The ECM checks for such changes in engine speed.

    DESCRIPTIONS OF MONITOR METHODS
    Monitor angular acceleration of crankshaft and detect malfunction when negative variation of the angular acceleration is large.

    MONITOR EXECUTION
    Continuous

    MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
    Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
    •Not applicable
    Sensor (The sensor below is determined to be normal)
    •Camshaft position sensor
    •Mass airflow sensor
    •Engine coolant temperature sensor
    •Intake air temperature sensor
    •Barometric pressure sensor
    •Throttle position sensor



    Check Conditions
    •Engine speed is between 438 and 6,594 r/min.
    •Engine coolant temperature is more than -10℃ (14℉). (However, 20℃ (68℉) when the engine coolant temperature at engine start is -10℃ (14℉) or less).
    •Barometric pressure is more than 76 kPa (22.4 in.Hg).
    •The engine load is with in the positive torque load.
    •Adaptive learning is complete for the vane which generates a crankshaft position signal.
    •While the engine is running, excluding rough road driving <M/T> sudden acceleration/deceleration and fuel shut-off operation.

    Judgment Criterion (change in the angular acceleration of the crankshaft is used for misfire detection)
    •Misfire has occurred more frequently than allowed during the last 200 revolutions [when the catalyst temperature is more than 1,000℃ (1,832℉)].
    or
    •Misfire has occurred more than in 2.0 percent of the first 1,000 revolutions (corresponding to 1.5 times the limit of emission standard).
    or
    •After the first 1,000 revolutions, the following criterion is satisfied 4 times cumulatively.
    •Misfire counts per 1,000 revolutions exceeds in 2.0 percent (corresponding to 1.5 times the limit of emission standard).

    FAIL-SAFE AND BACKUP FUNCTION
    •The supply of fuel to the misfiring cylinder can possibly be cut.

    OBD-II DRIVE CYCLE PATTERN
    Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 14 P.13A-10.

    TROUBLESHOOTING HINTS (The most likely causes for this code to be stored are:)
    •Ignition system related part(s) failed.
    •Low compression pressure.
    •ECM failed.



    DIAGNOSIS
    Required Special Tools:
    •MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
    •MB992745: V.C.I.-Lite main harness A
    •MB992747: V.C.I.-Lite USB cable short
    •MB992748: V.C.I.-Lite USB cable long
    •MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    •MB991824: Vehicles Communication Interface (V.C.I.)
    •MB991827: M.U.T.-III USB Cable
    •MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)


    STEP 1. Visual check on ignition spark of No. 1 cylinder.
    (1)Remove the spark plug and install it to the ignition coil.
    (2)Connect the ignition coil connector.
    (3)Disconnect all injector connector.
    (4)At the engine start, check spark plug produces a spark.
    Q: Did it spark?
    YES: Go to Step 3.
    NO: Go to Step 2.


    STEP 2. Check the No. 1 cylinder spark plug.
    Refer to GROUP 16, Ignition System - On-vehicle Service - Spark Plug Check And Cleaning P.16-28.
    Q:Is the spark plug normal?
    YES: Refer to, Symptom Procedures 26 - Ignition Circuit System P.13A-577.
    NO: Replace the No. 1 cylinder spark plug. Then go to Step 5.


    STEP 3. Check the compression.
    Refer to GROUP 11A, On-vehicle Service - Compression Pressure Check P.11A-16.
    Q:Are there any abnormalities?
    YES: Repair it. Then go to Step 5.
    NO: Go to Step 4.


    STEP 4. Check the trouble symptoms.
    (1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 14 P.13A-10.
    (2)Check the diagnostic trouble code (DTC).
    Q:Is DTC P0301 stored?
    YES: Replace the ECM (Refer to, Removal and Installation P.13A-656). Then go to Step 5.
    NO: It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions P.00-13.


    STEP 5. Test the OBD-II drive cycle.
    (1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 14 P.13A-10.
    (2)Check the diagnostic trouble code (DTC).
    Q:Is DTC P0301 stored?
    YES: Retry the troubleshooting.
    NO: The inspection is complete.

    Quote Originally Posted by Mitsubishi Mirage Service Manual section 13A MULTIPORT FUEL INJECTION (MFI)
    13A-39

    PATTERN 14

    Drive cycle pattern
    Inspection conditions •Engine coolant temperature: More than -10℃ (14℉)
    •Barometric pressure: More than 76 kPa (22.4 in.Hg)
    •Condition of CVT: Selector lever "D" range
    Test procedure 1.Start the engine with all the accessories switched OFF.
    2.Drive the vehicle for 3 minutes at the following conditions. (During the monitor)
    •Engine speed: More than 500 r/min, less than 3,000 r/min
    •Engine load: More than 20%
    •Without rapid accelerator pedal change
    •Except fuel cut
    3.Stop the vehicle in a safe place and turn the ignition switch to "LOCK" (OFF) position.
    4.Start the engine and do Steps 1 to 3 again.
    5.Confirm that the diagnostic trouble code (DTC) is not output.



        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)


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