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DTC P0300 [MZR-CD (RF Turbo)]

BME010200300W07

DTC P0300 | Random misfire detection
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DETECTION CONDITION | • PCM monitors CKP sensor input signal interval time. PCM calculates change of interval time for each cylinder. If the interval time exceeds preprogrammed criteria, PCM determines random misfire detection.
POSSIBLE CAUSE | • Fuel leakage or clogged in fuel line • Fuel injector malfunction • CKP sensor malfunction • CMP sensor malfunction • Inadequate engine compression
• PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Check for related Service Information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to next step.
No | Go to next step.
2 | FOLLOW OTHER DETECTED DTC FIRST • Turn engine switch to OFF. • Start engine. • Has P0200 been detected? | Yes | Go to DTC P0200 inspection. (See DTC P0200 [MZR-CD (RF Turbo)].)
No | Go to next step.
3 | INSPECT FUEL LINE • Turn engine switch to OFF. • Inspect for fuel leakage or clogs in following fuel lines for each cylinder:

  - Common rail and fuel injector.
  - Fuel injector and fuel tank.

• Is there any malfunction?
Yes
Repair or replace suspected fuel line, go to Step 8.
No | Go to next step.
4 | INSPECT FUEL INJECTOR • Inspect fuel injector. (See FUEL INJECTOR INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction? | Yes | Replace fuel injector, go to Step 8. (See FUEL INJECTOR REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No | Go to next step.
5 | INSPECT CKP SENSOR • Inspect CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction? | Yes | Replace CKP sensor, go to Step 8. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No | Go to next step.
6 | INSPECT CMP SENSOR • Inspect CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction? | Yes | Replace CMP sensor, go to Step 8. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No | Go to next step.
7 | INSPECT ENGINE COMPRESSION • Inspect engine compression. (See COMPRESSION INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction? | Yes | Implement engine overhaul for repairs, go to next step.
No | Go to next step.
8 | VERIFY TROUBLESHOOTING OF DTC P0300 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from PCM memory using WDS or equivalent. • Start engine. • Is same DTC present? | Yes | Replace PCM, go to next step. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No | Go to next step.
9 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [MZR-CD (RF Turbo)].) • Is there any DTC present? | Yes | Go to applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
No | Troubleshooting completed.