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Home >> Mazda >> 2021 >> 3 Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> On-Board Diagnostic - Engine Control System (VINS 7, L, M) (2 Of 4) >> DTC P050B-00: Cold Start Ignition Timing Performance Problem >> Diagnostic Procedure

Diagnostic Procedure

DTC P050B:00 (PCM, VINs 7, L, M) DIAGNOSTIC PROCEDURE

Step Inspection Results Action
1 IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
  • Is the DTC P050B:00 on freeze frame data?
 Yes Go to the next step.
No Go to the troubleshooting procedure for DTC on freeze frame data.
(See DTC TABLE [PCM (VINs 7, L, M) (US)] .)
2 RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION
  • Record the freeze frame data/snapshot data.
    NOTE:
    • Recording can be facilitated using the screen capture function of the PC.
 - Go to the next step.
3 VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY
  • Verify related Service Bulletins, on-line repair information, or Service Information availability.
  • Is any related Information available?
 Yes Perform repair or diagnosis according to the available information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
4 PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS PCM
  • Clear the DTC recorded in the memory. (See CLEARING DTC .)
  • Replicate the vehicle conditions at the time the DTC was detected using the following procedure.
    • Leave the vehicle for 7 hours or more.
      • Start the engine and leave it idling for 1 min.
    • Perform the DTC inspection for the PCM. (See DTC INSPECTION .)
    • Is the same Pending DTC present?
 Yes Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW (US) .)
If the CAN communication is normal, replace the PCM and perform the repair completion verification.
(See PCM REMOVAL/INSTALLATION [(VIN M) (US)] .)
(See PCM REMOVAL/INSTALLATION [(VIN 7 & VIN L) (US)] .)
No Go to the next step.
Repair completion verification VERIFY IF OTHER DTCs DISPLAYED
  • Perform the DTC inspection. (See DTC INSPECTION .)
  • Are any other DTCs displayed?
 Yes Repair the malfunctioning location according to the applicable DTC troubleshooting.
No DTC troubleshooting completed.
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