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Thread: First check engine light at 232000kms

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    First check engine light at 232000kms

    I finally had a check engine light come on one of our Mirage's. Car is a 2015 cvt with 232000kms on it. Code is P0421 Warm Up Catalyst Efficiency Below Threshold. It came yesterday afternoon, still runs and drives fine. I was able to clear the light but my scan tool says the code is permanent. Guess I'll have to fix before that goes away for good. I haven't had time to check the O2 sensors yet. I'll keep you posted what I find. Luckily if the cat is junk I have a spare with about 30k from our parts car that got hit by a garbage truck and I'll soon have 1 for sure, possible 2 parts cars on the way as well. Gotta love winter!



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    Administrator Daox's Avatar
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    That is quite a bit of driving! Thanks for updating us on this. I look forward to hear what the solution is. Hopefully just a new rear O2 sensor.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 49.0 mpg (US) ... 20.8 km/L ... 4.8 L/100 km ... 58.8 mpg (Imp)


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    I figured I should give an update. The check engine light came back on a few days after I cleared it. I didn't have much time to figure it out so I just changed the front cat with the rear O2 sensor with a used one I already had on the shelf with 30k on it. The light hasn't come back on since.

    It has 238000kms /148000miles on it now!
    Last edited by Fummins; 01-31-2017 at 03:09 PM. Reason: Add mileage

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    hi i envy your km.

    how about cvt?

    is it problem free too?

    good day

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    Quote Originally Posted by Tasshelhoff View Post
    hi i envy your km.

    how about cvt?

    is it problem free too?

    good day
    Hi, the car has just over 250000 now. That car puts on around 10000k a month. I haven't had any problems with the cvt's on any of the mirage's we have.

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    thanks for fast response.

    i wish million km without problem to you.

    good day again.

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    My car’s check engine light is on with same code (P0421). Some other codes which I got today are (U0401), (B1062) & (B1042). Any information in this regard would be highly appreciated.

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    Quote Originally Posted by Rohan Anwar View Post
    My car’s check engine light is on with same code (P0421). Some other codes which I got today are (U0401), (B1062) & (B1042). Any information in this regard would be highly appreciated.
    According to post #3 above Fummins says he replaced a catalytic converter and oxygen sensor to clear the fault.

        __________________________________________

        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 ... 59.6 mpg (Imp)


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    Junior Member Rohan Anwar's Avatar
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    Today I’ll clean Catalytic Converter and will let you guys know if it works as my car only has 53000 kms and changing Catalytic Converter makes no sense.

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    Quote Originally Posted by Rohan Anwar View Post
    My car’s check engine light is on with same code (P0421). Some other codes which I got today are (U0401), (B1062) & (B1042). Any information in this regard would be highly appreciated.
    Here>

    DTC P0421: Warm Up Catalyst Efficiency Below Threshold
    .
    TECHNICAL DESCRIPTION
    The signal from the heated oxygen sensor (rear) differs from the linear air-fuel ratio sensor, because the catalytic converter purifies exhaust gas. When the catalytic converter has deteriorated, the signal from the linear air-fuel ratio sensor becomes similar to the heated oxygen sensor (rear).
    The ECM compares the output of the linear air-fuel ratio sensor and heated oxygen sensor (rear) signals.
    .
    DESCRIPTIONS OF MONITOR METHODS
    Linear air-fuel ratio sensor and heated oxygen sensor (rear) rich/lean switching frequencies are nearly equal.
    .
    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)
    Linear air-fuel ratio sensor monitor
    Heated oxygen sensor (rear) monitor
    Linear air-fuel ratio sensor heater monitor
    Heated oxygen sensor heater (rear) monitor
    Heated oxygen sensor offset voltage monitor
    Misfire monitor
    Fuel system monitor
    Heated oxygen sensor (rear) feedback control system monitor
    Sensor (The sensor below is determined to be normal)
    Mass airflow sensor
    Engine coolant temperature sensor
    Intake air temperature sensor
    Barometric pressure sensor
    Throttle position sensor
    Accelerator pedal position sensor
    .
    MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
    TSB Revision
    13A-274 MULTIPORT FUEL INJECTION (MFI)
    DTC SET CONDITIONS
    Logic Flow Chart
    .
    Check Conditions
    Engine speed is less than 4,250 r/min <M/T> or 3,500 r/min <CVT>.
    Accelerator pedal is depressed.
    Mass airflow rate is between 6 and 45 g/sec <M/T> or 10 and 45 g/sec <CVT>.
    More than 3 seconds have passed after the above-mentioned three conditions have been met.
    Intake air temperature is more than 10C (14F).
    Barometric pressure is more than 76 kPa (22.4 in.Hg).
    Under the closed loop air/fuel ratio control.
    Vehicle speed is more than 1.5 km/h (1.0 mph).
    The ECM monitors the maximum 5 times <M/T> or 3 times <CVT> per drive cycle under these conditions.
    Short-term fuel trim is between 25 percent and +25 percent.
    StartMonitoringconditionsMalfunctionGoodEndNoNoYes YesRf > R0Calculate average frequencyratio (Rf = Fr/Ff) of specified timesR0, R1: Threshold valueACC07077Calculate frequency ofrear oxygen sensor output signal (Fr)Calculate frequency ratio (Rf = Fr/Ff) NoYesRf < R1Specified times monitored?NoYesCalculate frequency offront oxygen sensor output signal (Ff)
    MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
    TSB Revision
    MULTIPORT FUEL INJECTION (MFI) 13A-275
    The cumulative mass airflow is more than 901 g.
    The linear air-fuel ratio sensor rich/lean switching frequency is more than 8 times.
    Judgment Criterion
    When the monitoring for 10 seconds is carried out 5 times, the frequency ratio of heated oxygen sensor (rear) and linear air-fuel ratio sensor signals is more than the specified value.
    NOTE:
    The specified value varies depending on the average air flow rate.
    .
    FAIL-SAFE AND BACKUP FUNCTION
    None
    .
    OBD-II DRIVE CYCLE PATTERN
    Refer to Diagnostic Function  OBD-II Drive Cycle  Pattern 3 P.13A-10.
    .
    TROUBLESHOOTING HINTS (The most likely causes for this code to be stored are
    Catalytic converter deteriorated.
    Heated oxygen sensor failed.
    Exhaust leak.
    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. Replace the catalytic converter.
    (1)Replace the catalytic converter.
    (2)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function  OBD-II Drive Cycle  Pattern 3 P.13A-10.
    (3)Check the diagnostic trouble code (DTC).
    Q:Is DTC P0421 stored?
    YES :
    Replace the ECM (Refer to, Removal and Installation P.13A-656).
    NO :
    The inspection is complete.

    Code No. U0401 Engine (CAN message)
    CAUTION
    If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C  CAN Bus Diagnostics Table P.54C-12).
    Before replacing the ECU, ensure that the communication circuit is normal.
    When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to P.35C-134 and P.35C-135).
    .
    OPERATION
    Engine-related signals are sent or received to and from between ASC-ECU and engine control module via CAN bus lines.
    .
    DIAGNOSTIC TROUBLE CODE SET CONDITIONS
    This diagnostic trouble code is set when the engine control module malfunction has been detected.
    .
    PROBABLE CAUSES
    Malfunction of engine system
    Malfunction of engine control module
    Malfunction of ASC-ECU
    Noise interference
    DIAGNOSIS
    STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
    Use the scan tool MB991958 to diagnose the CAN bus lines.
    Q:Is the check result normal?
    YES :
    Go to Step 3.
    NO :
    Repair the CAN bus line (Refer to GROUP 54C  Troubleshooting P.54C-12) On completion, go to Step 2.
    STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines
    Q:Is diagnostic trouble code No. U0401 set?
    YES :
    Go to Step 3.
    NO :
    This diagnosis is complete.
    STEP 3. Check for diagnostic trouble codes of other systems.
    Check if diagnostic trouble code(s) other than U0401 is set.
    Q:Is the diagnostic trouble code set?
    YES :
    Follow the relevant diagnostic trouble code procedure, and then go to Step 5.
    NO :
    Go to Step 4.
    DIAGNOSIS
    TSB Revision
    35C-76 ACTIVE STABILITY CONTROL SYSTEM (ASC)
    STEP 4. Use scan tool MB991958 to confirm a diagnostic trouble code of other systems.
    Check if the diagnostic trouble code is set in the engine control module (Refer to GROUP 13A  Diagnostic Trouble Code Chart P.13A-47).
    Q:Is the diagnostic trouble code set?
    YES :
    Troubleshoot the engine control module diagnostic trouble code. Then go to Step 5.
    NO :
    Go to Step 5.
    STEP 5. Diagnostic trouble code recheck
    Check again if the diagnostic trouble code is set.
    (1)Erase the set diagnostic trouble code.
    (2)Ignition switch: "LOCK" (OFF)
    (3)Ignition switch: "ON"
    Q:Is diagnostic trouble code No. U0401 set?
    YES :
    Replace the hydraulic unit (integrated with ASC-ECU) (Refer to P.35C-137).
    NO :
    The trouble can be an intermittent malfunction (Refer to GROUP 00  How to Cope with Intermittent Malfunction P.00-13).
    Code No.B1061: Air outlet damper potentio.high
    Code No.B1062: Air outlet damper potentio.low
    .
    DIAGNOSTIC TROUBLE CODE SET CONDITION
    This code is stored when the mode selection damper control motor potentiometer does not send any signal to the A/C-ECU due to short or open circuit.
    .
    POSSIBLE CAUSES
    Malfunction of the mode selection damper control motor and potentiometer
    Damaged the wiring harness or connectors
    Malfunction of the auto A/C controller assembly (A/C-ECU).
    AUTOMATIC A/C DIAGNOSIS
    TSB Revision
    55B-12 AUTOMATIC AIR CONDITIONING
    DIAGNOSIS
    STEP 1. Using scan tool MB991958, check data list.
    Check that the following service data display contents are normal.
    Item No.55: Air outlet c/o potentiometer
    Item No.56: Air outlet c/o potentio.(Target)
    Q:Is the check result normal?
    YES :
    Go to Step 3.
    NO :
    Go to Step 2.
    STEP 2. Check open and short circuit in SENB, MODP and SENG line between mode selection damper control motor and potentiometer connector (potentiometer side) and auto A/C controller assembly (A/C-ECU) connector.
    Q:Is the check result normal?
    YES :
    Go to Step 4.
    NO :
    Repair the connector(s) or wiring harness.
    STEP 3. Check the mode selection damper control motor and potentiometer.
    Refer to P.55B-44.
    Q:Is the check result normal?
    YES :
    Go to Step 4.
    NO :
    Replace the mode selection damper control motor and potentiometer.
    STEP 4. Check whether the diagnostic trouble code is stored again.
    Q:Is the diagnostic trouble code stored?
    YES :
    Replace the auto A/C controller assembly (A/C-ECU).
    NO :
    The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction P.00-13).

    Code No.B1041: A/M damper potentiometer high
    Code No.B1042: A/M damper potentiometer low
    .
    DIAGNOSTIC TROUBLE CODE SET CONDITION
    This code is stored when the air mixing damper control motor potentiometer does not send any signal to the A/C-ECU due to short or open circuit.
    .
    POSSIBLE CAUSES
    Malfunction of the air mixing damper control motor and potentiometer
    Damaged the wiring harness or connectors
    Malfunction of the auto A/C controller assembly (A/C-ECU)



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