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No. 13 Knocking/Pinging-Acceleration/Cruise: Notes

NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE DESCRIPTION AND POSSIBLE CAUSES (SKYACTIV-G 2.0, SKYACTIV-G 2.5)

13  KNOCKING/PINGING-ACCELERATION/CRUISE 
DESCRIPTION 
  • Abnormal combustion occurs under the condition such as the temperature in the combustion chamber is too high resulting in abnormal noise.
  • Knocking sound occurs from the engine compartment during acceleration.
POSSIBLE CAUSE 
  • Poor fuel quality
    • Fuel RON is not specified
    • Excessive cleaning agents added in fuel
  • Poor connection of KS, wiring harness
  • The following information for calculating ignition timing is incorrect:
    • KS signal
    • ECT sensor No. 1 signal
    • IAT sensor No. 2 (integrated in MAP sensor) signal
    • MAF sensor signal
      • Air suction in intake-air system
    • MAP sensor signal
  • Combustion temperature is high
    • Cooling system malfunction
    • Carbon accumulation
    • Use of non-genuine spark plug
      WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:
      • Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
      • Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION .) (See AFTER SERVICE PRECAUTION .)
      CAUTION:
      • Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign matter.
CAUTION:
  • Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.
RELATED PIDS

Item (definition) Unit/Condition Definition Condition/Specification (Reference)
BARO KPa {MPa}, mBar {Bar}, psi, in H20 Actually measured barometric pressure input from barometric pressure sensor built into PCM
  • Displays BARO
V BARO sensor voltage
  • Ignition switched ON (at sea level): Approx. 4.08 V
ECT °C, °F Engine coolant temperature
  • Displays ECT
V ECT sensor No. 1 voltage
  • ECT is 20 °C {68 °F}: Approx. 3.10 V
  • ECT is 40 °C {104 °F}: Approx. 2.16 V
  • ECT is 60 °C {140 °F}: Approx. 1.40 V
  • ECT is 80 °C {176 °F}; Approx. 0.87 V
  • ECT is 100 °C {212 °F}: Approx. 0.54 V
IAT2 °C, °F Intake air temperature (No. 2)
  • Displays IAT (No. 2)
V IAT sensor No. 2 voltage
  • IAT2 is 20 °C {68 °F}: Approx. 3.57 V
  • IAT2 is 40 °C {104 °F}; Approx. 2.70 V
  • IAT2 is 60 °C {140 °F}: Approx. 1.87 V
MAF g/Sec Mass air flow
  • Displays MAF
V MAF sensor voltage
  • Ignition switched ON (engine off) (MAF: 0.59 g/s {0.078 lb/min}): Approx. 0.72 V
  • Idle (after warm up) (MAF: 2.17 g/s {0.287 lb/min}): Approx. 0.86 V
  • Racing (engine speed is 2, 000 rpm) (MAF; 4.73 g/s {0, 626 lb/min}): Approx. 1.07 V
MAP KPa {MPa}, mBar {Bar}, psi, in H20 Manifold absolute pressure
  • Displays MAP
V WAP sensor voltage
  • Ignition switched ON (engine off) (MAP: 101 kPa {1.03 kgf/cm2 , 14.6 psi}): Approx. 4.07 V
  • Idle (after warm up) (MAP: 33 kPa {0.34 kgf/cm2 , 4.8 psi}): Approx. 1.34 V
  • Racing (engine speed is 2, 000 rpm) (MAP: 26 kPa {0.27 kgf/cm2 , 3.8 psi}): Approx. 1.05 V
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