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Home >> Lexus >> 2021 >> NX 300 Luxury, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (5 Of 9) >> SFI System >> DTC P0300-00: Random/Multiple Cylinder Misfire Detected; DTC P0300-27: Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold; DTC P0300-85: Random / Multiple Cylinder Misfire Detected (Over Temperature) Signal Above Allowable Range; DTC P0301-00: Cylinder 1 Misfire Detected; DTC P0302-00: Cylinder 2 Misfire Detected; DTC P0303-00: Cylinder 3 Misfire Detected; DTC P0304-00: Cylinder 4 Misfire Detected [09/2015 - 09/2017] >> Monitor Result
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Monitor Result

Refer to detailed information in Checking Monitor Status.

Refer to CHECKING MONITOR STATUS [10/2014 - ]

P0300: MISFIRE / EWMA MISFIRE

Monitor ID Test ID Scaling Unit Description
$A1 $0B Multiply by 1 Count Total EWMA* misfire count of all cylinders in last ten driving cycles
P0300: MISFIRE / MISFIRE RATE

Monitor ID Test ID Scaling Unit Description
$A1 $0C Multiply by 1 Count
  • When engine switch on (IG), total misfire count of all cylinders in last driving cycle is displayed.
  • While engine is running, total misfire count of all cylinders in current driving cycle is displayed.
P0301: MISFIRE / EWMA MISFIRE1

Monitor ID Test ID Scaling Unit Description
$A2 $0B Multiply by 1 Count Total EWMA* misfire count of cylinder 1 in last ten driving cycles
P0301: MISFIRE / MISFIRE RATE1

Monitor ID Test ID Scaling Unit Description
$A2 $0C Multiply by 1 Count
  • When engine switch on (IG), total misfire count of cylinder 1 in last driving cycle is displayed.
  • While engine is running, total misfire count of cylinder 1 in current driving cycle is displayed.
P0302: MISFIRE / EWMA MISFIRE2

Monitor ID Test ID Scaling Unit Description
$A3 $0B Multiply by 1 Count Total EWMA* misfire count of cylinder 2 in last ten driving cycles
P0302: MISFIRE / MISFIRE RATE2

Monitor ID Test ID Scaling Unit Description
$A3 $0C Multiply by 1 Count
  • When engine switch on (IG), total misfire count of cylinder 2 in last driving cycle is displayed.
  • While engine is running, total misfire count of cylinder 2 in current driving cycle is displayed.
P0303: MISFIRE / EWMA MISFIRE3

Monitor ID Test ID Scaling Unit Description
$A4 $0B Multiply by 1 Count Total EWMA* misfire count of cylinder 3 in last ten driving cycles
P0303: MISFIRE / MISFIRE RATE3

Monitor ID Test ID Scaling Unit Description
$A4 $0C Multiply by 1 Count
  • When engine switch on (IG), total misfire count of cylinder 3 in last driving cycle is displayed.
  • While engine is running, total misfire count of cylinder 3 in current driving cycle is displayed.
P0304: MISFIRE / EWMA MISFIRE4

Monitor ID Test ID Scaling Unit Description
$A5 $0B Multiply by 1 Count Total EWMA* misfire count of cylinder 4 in last ten driving cycles
P0304: MISFIRE / MISFIRE RATE4

Monitor ID Test ID Scaling Unit Description
$A5 $0C Multiply by 1 Count
  • When engine switch on (IG), total misfire count of cylinder 4 in last driving cycle is displayed.
  • While engine is running, total misfire count of cylinder 4 in current driving cycle is displayed.

HINT: 

*: EWMA (Exponential Weighted Moving Average) misfire counts for last 10 driving cycles (calculated) Calculation: 0.1 x (current counts) + 0.9 x (previous average)

Initial value for (previous average) = 0

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