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Home >> Mazda >> 2021 >> CX-30 Turbo Premium >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (On-Board Diagnostic - Engine Control System (4 Of 4)) >> DTC P3498-00: No. 1 Cylinder Valve Is Stuck Closed Or P349B-00: No. 4 Cylinder Valve Is Stuck Closed (Us) >> Function Inspection Using M-MDS

Function Inspection Using M-MDS

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE - FUNCTION INSPECTION USING M-MDS

STEP INSPECTION RESULTS ACTION
1 PURPOSE: 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.
2 PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
  • Is the DTC P3498:00 or P349B: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 (US) .)
3 PURPOSE: 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.
4 PURPOSE: INSPECT FOR OTHER RELATED DTCs
  • Perform the DTC inspection for the PCM. (See DTC INSPECTION .)
  • Are any other DTCs displayed?
 Yes Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE (US) .)
No Go to the next step.
5 PURPOSE: VERIFY IF THERE IS PID ITEM CAUSING DRASTIC CHANGES OF ACCELERATION FLUCTUATION BY INPUT SIGNAL TO PCM
  • Start the engine.
  • Access the following PIDs using the MMDS: (See PID/DATA MONITOR INSPECTION .)
    • APP1
    • APP2
    • ECT
    • ECT_VOLT
    • IAT
    • MAF
    • MAP
    • MAP_VOLT
    • ENG_RPM
    • TP_RELAT
    • VSS
  • Is there a PID item affected by acceleration fluctuation?
 Yes Inspect the suspected sensor and related wiring harness.
  • If there is any malfunction:
    • Repair or replace the malfunctioning part.
    • Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification.
  • If there is no malfunction:
    • Go to the next step.
No Go to the next step.
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