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

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.
TROUBLE AREA	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 information. Refer to PRECAUTION [07/2015 - ] Refer to ON-VEHICLE INSPECTION [07/2015 - ] NOTE: 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.

NOTE:

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)
Barometric pressure	kPa	Actually measured barometric pressure input from barometric pressure sensor built into ECM	Displays BARO
Engine coolant temperature	°C, °F	Engine coolant temperature	Displays ECT
Engine coolant temperature	V	ECT sensor No. 1 voltage	Ignition switched ON (engine off) ECT is 29°C {84°F}: Approx. 2.65 V ECT is 88°C {190°F}: Approx. 0.71 V
Intake Air Temperature 2	°C, °F	Intake air temperature (No. 2)	Displays IAT (No. 2)
Intake Air Temperature 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
Mass Air Flow	gm/sec	Mass air flow	Displays MAF
Mass Air Flow	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. 0.97 V Racing (engine speed is 2000 RPM) (MAF: 4.73 g/s {0.626 lb/min}): Approx. 1.26 V
Manifold absolute pressure sensor	kPa	Manifold absolute pressure	Displays MAP
Manifold absolute pressure sensor	V	MAP sensor voltage	Ignition switched ON (engine off) (MAP:101 kPa {1.03 kgf/cm² , 14.6 psi}): Approx. 4.12 V Idle (after warm up) (MAP: 33 kPa {0.34 kgf/cm² , 4.8 psi}): Approx. 1.9 V Racing (engine speed is 2000 RPM) (MAP: 26 kPa {0.27 kgf/cm² , 3.8 psi}): Approx. 1.23 V