No.13 Knocking/Pinging-Acceleration/Cruise: Notes
DESCRIPTION & POSSIBLE CAUSE
| 13 |
KNOCKING/PINGING-ACCELERATION/CRUISE |
| DESCRIPTION |
- Sound is produced when air/fuel mixture is ignited by something other than spark plug, (e.g., hot spot in combustion chamber)
|
| POSSIBLE CAUSE |
- Poor fuel quality
- Fuel RON is not specified
- Excessive cleaning agents added in fuel
- Combustion temperature is high
- Engine overheating due to cooling system malfunction
- Carbon accumulation (production of heat spot)
- Plug thermal value is low
- Plug malfunction (production of heat spot)
- Ignition timing for calculating PCM is incorrect
- PCM DTC is stored
- Estimated intake air amount is deviated
- ECT sensor No.1 or related circuit malfunction
- IAT sensor No.2 (integrated in MAP sensor) or related circuit malfunction
- Temperature correction is incorrect
- Air leakage or restriction in intake-air system
- MAF sensor or related circuit malfunction
- MAP sensor or related circuit malfunction
- KS or related circuit malfunction
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 material.
|
CAUTION:
- Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.
RELATED PIDs DESCRIPTION
| Monitor item (Definition) |
Unit/Condition |
Condition/Specification (Reference) |
| ECT |
°C, °F |
|
| V |
- ECT is 20°C {68°F}: approx. 3.1 V
- ECT is 40°C {104°F}: approx. 2.2 V
- ECT is 60°C {140°F}: approx. 1.40 V
- ECT is 80°C {176°F}: approx. 0.9 V
- ECT is 100°C {212°F}: approx. 0.5 V
|
| IAT2 |
°C, °F |
|
| V |
- IAT2 is 20°C {68°F}: approx. 3.60 V
- IAT2 is 40°C {104°F}: approx. 2.70 V
- IAT2 is 60°C {140°F}: approx. 1.90 V
|
| MAF |
g/sec |
|
| V |
- MAF is 1 g/s {0.13 lb/min}: approx. 0.8 V
- MAF is 3 g/s {0.4 lb/min}: approx. 0.9 V
- MAF is 10 g/s {1.3 lb/min}: approx. 1.4 V
|
| MAP |
KPa {MPa}, mBar {Bar}, psi, in H20 |
|
| V |
- Switch the ignition to ON (MAP: 101 kPa {1.03 kgf/cm 2
, 14.6 psi}): approx. 4.07 V
- Idle (after warm up) (MAP: 33 kPa {0.34 kgf/cm 2
, 4.8 psi}): approx. 1.34 V
- Racing (engine speed is 2,000 rpm
) (MAP: 26 kPa {0.27 kgf/cm 2
, 3.8 psi}): approx. 1.05 V
|