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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 145 (On-Board Diagnostic - Engine Control (2 Of 5)) >> DTC P0301; P0302; P0303; P0304; Pcm Misfire Detected 1, 2, 3, 4 >> Details On DTCs

Details On DTCs

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION AND POSSIBLE CAUSE

DESCRIPTION P0301:00: Cylinder No. 1 misfire detected
P0302:00: Cylinder No. 2 misfire detected
P0303:00: Cylinder No. 3 misfire detected
P0304:00: Cylinder No. 4 misfire detected
DETECTION CONDITION Determination conditions
  • Any one of the following conditions is met:
    • The misfire rate of specific cylinders for every 200 rotations of the crankshaft exceeds the specified value (misfire which may damage catalytic converter).
      • The misfire rate of specific cylinders for every 1, 000 rotations of the crankshaft exceeds the specified value (misfire going against emission regulations).
Preconditions
  • Battery voltage: 9-18 V(1)
  • Engine speed: 500-6, 700 rpm(1)(U.S.A. and CANADA)
  • Engine speed: 500-4, 500 rpm(1)(except U.S.A. and CANADA)
  • Engine coolant temperature: -10 °C {14 °F} or more(1) (U.S.A. and CANADA)
  • Engine coolant temperature: 20 °C {68 °F} or more(1) (except U.S.A. and CANADA)
  • Not cranking (U.S.A. and CANADA)
  • Not stalling (U.S.A. and CANADA)
  • Fuel-cut control not implemented
  • Crankshaft installation tolerance learning completed
  • Engine condition is stabilized (not directly after gear change)
Malfunction determination period
  • 200 rotations of crankshaft (misfire which may damage catalytic converter)
  • 1, 000 rotations of crankshaft (misfire going against emission regulations)
Drive cycle
  • 2
Self test type
  • CMDTC self test
Sensor used
  • CKP sensor
  • MAF sensor
  • MAP sensor
FAIL-SAFE FUNCTION
  • Limits intake air amount
  • Implement fuel-cut control (if the catalytic converter may be damaged, perform fuel-cut on cylinder misfiring the most).
VEHICLE STATUS WHEN DTCs ARE OUTPUT
  • Misfiring which may damage catalytic converter (number of drive cycles: 1):
    • Check engine light flashes and pending code is recorded
  • Drive cycle directly after above drive cycle (number of drive cycles: 2):
    • Malfunction determined: check engine light is illuminated
      • Normal is determined: Pending code cleared
  • Rough idling, poor acceleration, stalling
POSSIBLE CAUSE
  • Improper operation of ignition system
    • Spark plug malfunction
    • Ignition coil related wiring harness or connector malfunction
      • Ignition coil malfunction
  • Fuel injector malfunction
    • Improper operation of fuel injector
      • Fuel injector related wiring harness malfunction
  • Erratic signal to PCM
    • CKP sensor signal malfunction
    • ECT sensor No. 1 signal malfunction
    • MAF sensor signal malfunction
    • MAP sensor signal malfunction
    • IAT sensor No. 1 signal malfunction
    • APP sensor signal malfunction
    • TP sensor signal malfunction
    • VSS signal malfunction
    • Related connector or terminals malfunction
      • Related wiring harness malfunction
  • Poor drive belt assembly or adhesion of oil
  • Drive belt auto tensioner malfunction
  • Air leakage from intake air system (between intake manifold and cylinder head)
  • Engine malfunction
    • Insufficient engine compression
      • Engine coolant leakage to combustion chamber
  • PCM malfunction
(1) Value can be verified by displaying PIDs using M-MDS
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