Check Engine Light on with DTC P0421 – 2014-2016 Mazda

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Subject:

CHECK ENGINE LIGHT ON WITH DTC P0421

Bulletin No: 01-010/16
Last Issued: 04/07/2016

 

BULLETIN NOTE

This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted below in Red beside the change bars.

Previously Issued TSBs: Date(s) Issued
01-016/15 08/04/15

 

APPLICABLE MODEL(S)/VINS

2014-2015 Mazda3 (Japan built) vehicles with VINs lower than JM1BM******267077 (produced before March 30, 2015)

2014-2015 Mazda3 (Mexico built) vehicles with VINs lower than 3MZBM******207478 (produced before April 1, 2015)

2014-2016 Mazda6 vehicles with VINs lower than JM1GJ******425952 (produced before April 8, 2015)

2014-2015 CX-5 (2.5L A/T only)

2016 CX-5 vehicles with VINs lower than JM3KE******656820 (produced before April 8, 2015)

 

DESCRIPTION

Some vehicles may experience the check engine light on with DTC P0421:00 (Catalytic converter system) without experiencing poor engine performance or misfire (Mitsubishi PCM only).

This is caused by improper control logic of the PCM that may detect false error of the A/F sensor, resulting in false detection of P0421. To correct the problem, the control logic of the PCM has been changed. Catalyst monitor function explanation

  • The PCM monitors the oxygen storage amount proportional to catalytic converter purification characteristic.
  • The PCM starts to monitor after recovery (fuel injection starts) from fuel cut control.
  • The PCM temporarily changes the target air/fuel ratio to rich at fuel cut recovery, and detects the response time until the HO2S output signal outputs the voltage on the rich side.
  • If the catalytic converter purification characteristic deteriorates, the amount of the time until the HO2S detects the voltage on the rich side is shorter compared to the normal purification characteristic as shown. The PCM detects a catalytic converter malfunction using this characteristic.

Catalyst monitor function

 

REPAIR PROCEDURE

Verification of Condition of Warm Up Three-Way Catalytic Converter (WU-TWC)

  1. Verify the condition of the Warm Up Three-Way Catalytic Converter (WU-TWC) by checking the value “Catalyst monitor bank 1” on MODE6 with M-MDS or Scan Tool.
    1. Go to Powertrain => OBD Test Modes => Mode6 On Board Test Results

Mode6 On Board Test Results

    1. Go to Catalyst monitor bank 1 => Equivalence Oxygen Storage Component (OBDMID: 21, Test ID: 82)

Catalyst monitor bank 1 => Equivalence Oxygen Storage Component (OBDMID: 21, Test ID: 82)

  • If the value is “equal to 0”, clear the DTC and go to PCM Reprogramming.
  • If the value is “equal to 2 or higher”, clear the DTC and go to PCM Reprogramming.
  • If the value is “between 0 and 2”, follow these steps:
    1. Clear the DTC and reprogram the PCM.
    2. Disconnect the negative battery cable to clear the PCM memory (at least 1 min.)
    3. Go into the “DRIVE MODE”:
      1. Drive the vehicle at about 50mph for 15min.
      2. Decelerate to 25 mph, and shift into M-Mode, 3rd gear.
      3. Accelerate to 40 mph while holding the transmission in 3rd gear.
      4. Stay at 40 mph for 3 seconds, then release the accelerator pedal and decelerate to 25 mph.
      5. Accelerate to 40 mph again while holding the transmission in 3rd gear.
      6. Stay at 40 mph for 3 seconds, then release the accelerator pedal and decelerate to 25 mph again.
      7. Repeat steps b-f (acceleration and deceleration) at least 10 times.
    4. Check the value “Catalyst monitor bank 1” on MODE6 with M-MDS.
      • If the value is “equal to 1 or higher than 1”, WU-TWC can be judged as OK.
      • If the value is “less than 1”, WU-TWC should be deteriorated. Refer to MS3 online instructions for DTC P0421:00 or Workshop manual section 01-01.

 

PCM Reprogramming

  1. Using IDS 99.05 or later software, reprogram the PCM to the latest calibration (refer to “Calibration Information” table) by following the “Module Reprogramming” procedure.

 

NOTE:

  • Verify the current PCM file name in the vehicle by the log view screen. If it is the same as found in the chart below (or later), it is not necessary to reprogram the PCM.
  • Always update the IDS tool first, then follow the on-screen instructions to download the calibration file for PCM reprogramming.
  • Refer to “Service Caution for reprogramming” on MS3 IDS Page.
  • After reprogramming, verify the file name matches with the chart below.

 

NOTE:

  • Always update the IDS tool first, then follow on-screen instructions to download the needed calibration file for PCM reprogramming.
  • It is not necessary to remove any fuses or relays during PCM reprogramming when the IDS screen prompts you to do so. You may accidentally stop power to one of the PCM terminals and cause the PCM to be blanked, or you may receive error messages during the IDS reprogramming procedure.
  • IDS shows the calibration part numbers after programming the PCM.
  • Please be aware that PCM calibration part numbers and file names listed in any Service Bulletin may change due to future releases of IDS software, and additional revisions made to those calibrations for service related concerns.
  • When reprogramming a PCM, IDS will always display the “latest” calibration P/N available for that vehicle. If any calibration has been revised/updated to contain new information for a new service concern/issue, it will also contain all previously released calibrations.
  • Start/Stop button vehicles only: DO NOT press the start/stop button during the reprogramming process.
  • When performing this procedure, we recommend using the “Power Supply” mode in the Battery Management System to keep the vehicle battery up to capacity. If a different charger is used, make sure it does not exceed 20 AMPS. If it exceeds 20 AMPS, it could damage the VCM.

 

  1. After performing the PCM reprogramming procedure, clear DTCs.
  2. After clearing DTCs, start the engine and confirm that no warning lights stay on.

 

NOTE:

  • If any DTCs should remain after performing DTC erase, diagnose the DTCs using MS3 online instructions or Workshop Manual section 01-02.
  • After PCM reprogramming, it is no longer necessary to road test the vehicle to “relearn” KAM (Keep Alive Memory).

CALIBRATION INFORMATION

2014-2015 Mazda3 (Japan built) for VINs starting with JM1

Engine Emissions Transmission File Name Note
2.0L Calif (PZEV) M/T PELC-188K2-C
A/T PELA-188K2-C
Calif (ULEV) M/T PE18-188K2-E
A/T PE19-188K2-D
Fed M/T PE5J-188K2-E
A/T PE5K-188K2-D
2.5L Calif (PZEV) M/T PYBE-188K2-C Improved from B-level
A/T PY08-188K2-D w/out i-ELOOP
PY2P-188K2-F w/ i-ELOOP (to Feb 1, 2015)
PYFG-188K2-A w/ i-ELOOP (from Feb 1, 2015)
Fed M/T PYBG-188K2-B
A/T PY2J-188K2-D w/out i-ELOOP
PY2R-188K2-F w/ i-ELOOP (to Feb 1, 2015)
PYFH-188K2-A w/ i-ELOOP (from Feb 1, 2015)
Mexico M/T PYBJ-188K2-B
A/T PY8E-188K2-C

 

2014-2015 Mazda3 (Mexico built) for VINs starting with 3MZ

Emissions Transmission File Name Note
Calif (PZEV) M/T PELG-188K2-C Improved from B level
A/T PELE-188K2-C Improved from B level
Calif (ULEV) M/T PEDG-188K2-D Improved from C level
A/T PEDH-188K2-C Improved from B level
Fed M/T PEDJ-188K2-D Improved from C level
A/T PEDK-188K2-C Improved from B level
Mexico M/T PEGN-188K2-B
A/T PEGR-188K2-B

 

2014-2015 Mazda6

Emissions Transmission File Name Note
Calif (PZEV) M/T PYXS-188K2-  Old file name: PY1D-188K2-*
A/T PYXT-188K2-  Old file name: PY1E-188K2-*
PYXW-188K2- w/ i-ELOOP

Old file name: PY8G-188K2-*

Calif (ULEV) M/T PY8A-188K2-D
A/T PY8B-188K2-D
PY1G-188K2-H w/ i-ELOOP
Fed M/T PYXX-188K2-  Old file name: PY1H-188K2-*
A/T PYXZ-188K2-  Old file name: PY1J-188K2-*
PZY1-188K2- w/ i-ELOOP

Old file name: PY2E-188K2-*

Mexico M/T PZZ4-188K2- Old file name: PY4J-188K2-*
A/T PZZ5-188K2- Old file name: PY4K-188K2-*

 

2016 Mazda6

Emissions Transmission File Name Note
Calif (PZEV) M/T PY9S-188K2-C
A/T PY9V-188K2-C
PY9X-188K2-C w/ i-ELOOP
Fed M/T PYAB-188K2-B
A/T PYAD-188K2-B
PYAF-188K2-B w/ i-ELOOP
Mexico M/T PYBA-188K2-B
A/T PYBC-188K2-B w/ i-ELOOP

 

2014-2015 CX-5

Engine Emissions Transmission Drive File Name Notes
2.0L Mexico A/T 2WD PEBG-188K2-D
2.5L Calif A/T 2WD PYXH-188K2- Old file name: PY09-188K2-*
4WD PYXJ-188K2- Old file name: PY2W-188K2-*
Fed A/T 2WD PYXK-188K2- Old file name: PY2V-188K2-*
4WD PYXL-188K2- Old file name: PY2X-188K2-*
Mexico A/T 2WD PY5L-188K2-D
4WD PY5M-188K2-D

 

2016 CX-5

Engine Emissions Transmission Drive File Name
2.0L Calif M/T 2WD PS32-188K2-C
A/T 2WD PS33-188K2-C
4WD PS34-188K2-C
Fed M/T 2WD PS35-188K2-C
A/T 2WD PS36-188K2-C
4WD PS37-188K2-C
Mexico A/T 2WD PS38-188K2-C
2.5L Calif A/T 2WD PYAJ-188K2-C
4WD PYAK-188K2-B
Fed A/T 2WD PYAL-188K2-B
4WD PYAM-188K2-C
Mexico A/T 2WD PYAN-188K2-B
4WD PYAP-188K2-B

 

NOTE: It is not necessary to order a PCM part for this repair procedure.

 

WARRANTY INFORMATION

NOTE:

  • This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.
  • This repair will be covered under Mazda’s Federal Emission Warranty (long term) or Calif. PZEV Emission Warranty.
  • Additional diagnostic time cannot be claimed for this repair.
  • Keep a copy of Mode 6 report on file for as required documentation purposes.
Warranty Type A
Symptom Code 6X
Damage Code 9W
DTC P0421
Part Number Main Cause 5555-RP-PCM
Quantity 0
Operation Number / Labor Hours XXL4PXFX / 0.3 Hrs. (Reprogramming)

XXL4PAFX / 0.8 Hrs. (Reprogramming and DRIVE MODE)

 


01-010/16

 

04/07/2016

https://www.nhtsa.gov/recalls?nhtsaId=10093127

https://static.nhtsa.gov/odi/tsbs/2016/SB-10093127-6903.pdf

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Mazda Reprogramming

Mazda Reprogramming

 

 


MDSFA/MMP Required Hardware (Not Included)  

As shown in the diagram, an SAE J2534 pass-thru device is required to use the application.

J2534 Connection

 

Hardware validated by Mazda can be purchased separately from a third-party supplier. Validation has been done using the following J2534 pass-thru device and cables:

  • CarDAQ+ (includes RS232 and Ethernet cables)
  • Cable between CarDAQ and Vehicle – CD2534-J1962-FEPS (Sold separately / Required)

 

Important Information: Mazda makes no representations about the performance of third-party passthru devices. This pass-thru device list is provided voluntarily and as a courtesy. While our software meets SAE J2534, the pass-thru device manufacturer is responsible for making sure their pass-thru device operates properly on each Mazda vehicle and with Mazda software. We have listed the devices below because their manufacturers have attested that the tools have been validated to work. From time to time, we may test these devices. If we determine they do not operate properly or are obsolete, we may remove them from the list, without notice. Additionally, pass-thru devices listed here have been listed for their use with Mazda North American products only. While they may work with some European and other vehicles, they may not meet the requirements for those regions or operate properly.

 

Hardware can be purchased from a third-party supplier. Mazda has validated the following J2534 passthru devices:

 

**J2534 Pass-thru Device Manufacturer
*CarDAQ+ Drew Technologies Inc.
*Pass-Thru+XS Actia Corp.
*Snap-On Pass Thru Pro II Snap-On.
*Universal Reprogrammer EASE Diagnostics
*FLASH2 All-Makes Reprogrammer CARDONE Industries
*Bosch Mastertech VCI Bosch Diagnostics

*Contact the device manufacturer for the latest DLL and firmware versions.

**Many J2534 manufacturers sell and market similar J2534 devices with like names. Please exercise caution when using the list above for purposes of understanding devices Mazda has validated for use. J2534 Pass-thru Device Suppliers: Mazda has validated the J2534 devices listed on this page. Mazda does not plan to validate additional J2534 devices at this time.

 

PCM Reprogramming Process Overview 

  • Purchase a subscription to PCM Reprogramming on this website.
  • Download the application and install it on your PC.
  • Connect the J2534 pass-thru device to the PC and the vehicle, and power it up.
  • Run the application installed on your PC.
  • The application will determine whether or not a new calibration file is available.
  • If you choose to use the new file, the module will be reprogrammed.
  • If PATS functionality is required, it can be chosen from the toolbox.

 

Check Engine Light on with DTC P0421 - 2014-2016 Mazda | small light CarDAQ-Plus 3 All Makes J2534 Reprogramming Tool
Check Engine Light on with DTC P0421 - 2014-2016 Mazda | small light CarDAQ-Plus 2 Diagnostic Code Reader and J2534 Programming Tool
Check Engine Light on with DTC P0421 - 2014-2016 Mazda | small light RAP2 OEM J2534 Remote Reprogramming Tool
Check Engine Light on with DTC P0421 - 2014-2016 Mazda | small light CarDAQ-Plus
Check Engine Light on with DTC P0421 - 2014-2016 Mazda | small light CarDAQ-M
Check Engine Light on with DTC P0421 - 2014-2016 Mazda | small light VSI J2534 ECU Reprogrammer
Check Engine Light on with DTC P0421 - 2014-2016 Mazda | small light Bosch Automotive Tools MTECH2 Mastertech II J2534 VCI with Wired/Wireless Capability for OEM Reprogramming and Diagnostics on GM, Ford, FCA, Nissan/Infiniti, Honda/Acura, and Toyota/Lexus Vehicles
Check Engine Light on with DTC P0421 - 2014-2016 Mazda | small light Autel MaxiFlash Elite VCI J2534 Pass-Thru ECU Programming Tool
Check Engine Light on with DTC P0421 - 2014-2016 Mazda | small light BOSCH Automotive Tools MTECH2 Mastertech II J2534 VCI
Check Engine Light on with DTC P0421 - 2014-2016 Mazda | small light Autel MaxiFlash VCI Vehicle Communication Interface J2534 PassThru ECU Programming Device Bluetooth Connection Internet Update Support CAN FD, 4 CAN Channels, DoIP, D-PDU Works with PC or Autel MS909
Check Engine Light on with DTC P0421 - 2014-2016 Mazda | small light VXDIAG VCX Nano Compatible for GM/OPEL with GDS2 and Tech2WIN System Diagnostic Tool
Check Engine Light on with DTC P0421 - 2014-2016 Mazda | small light GODIAG J2534

 

 

https://www.mazdaserviceinfo.com/pcm-reflashing

 


 

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Last update on 2024-06-17 / Affiliate links / Images from Amazon Product Advertising API

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