No. 15 Emission Compliance: Notes

POSSIBLE CAUSES DESCRIPTIONS

15	EMISSION COMPLIANCE
DESCRIPTION	Fails emissions test.
POSSIBLE CAUSE	Poor fuel quality Vacuum lines leakage or blockage Cooling system malfunction Engine overheating Spark plug malfunction Air leakage from intake-air system Variable swirl system malfunction Wastegate control system improper operation Turbocharger malfunction Charge air cooler malfunction Inadequate fuel pressure (high-pressure side) PCV valve malfunction or incorrect valve installation EGR system malfunction Exhaust system and/or three-way catalytic converter restriction Fuel tank ventilation system malfunction Charcoal canister damage Air cleaner element clogging or restriction Throttle body malfunction Improper operation of electronic throttle control system Relief valve malfunction (built-in delivery pipe) Suction control valve malfunction (built-in high pressure fuel pump) Improper air/fuel mixture ratio control operation Erratic or no signal from CMP sensor Erratic signal from CKP sensor Front or rear HO2S or related circuit malfunction ECT or related circuit malfunction MAF sensor or related circuit malfunction IAT sensor No.1 or related circuit malfunction IAT sensor No.2 or related circuit malfunction Fuel pressure sensor or related circuit malfunction Accelerator position sensor or related circuit malfunction TP sensor or related circuit malfunction Manifold absolute pressure (MAP) sensor or related circuit malfunction Neutral or clutch switch malfunction VSS or related circuit malfunction Fuel line restriction High pressure fuel pump malfunction Fuel injector or related circuit malfunction Incorrect fuel injection timing Three-way catalytic converter (TWC) malfunction Engine internal parts malfunction Excessive carbon is built-up in combustion chamber Improper engine compression Improper valve timing Injector driver module 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE ). (See AFTER REPAIR PROCEDURE ). 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.

EMISSION COMPLIANCE

DESCRIPTION

Fails emissions test.

POSSIBLE CAUSE

Poor fuel quality
Vacuum lines leakage or blockage
Cooling system malfunction
Engine overheating
Spark plug malfunction
Air leakage from intake-air system
Variable swirl system malfunction
Wastegate control system improper operation
Turbocharger malfunction
Charge air cooler malfunction
Inadequate fuel pressure (high-pressure side)
PCV valve malfunction or incorrect valve installation
EGR system malfunction
Exhaust system and/or three-way catalytic converter restriction
Fuel tank ventilation system malfunction
Charcoal canister damage
Air cleaner element clogging or restriction
Throttle body malfunction
Improper operation of electronic throttle control system
Relief valve malfunction (built-in delivery pipe)
Suction control valve malfunction (built-in high pressure fuel pump)
Improper air/fuel mixture ratio control operation
Erratic or no signal from CMP sensor
Erratic signal from CKP sensor
Front or rear HO2S or related circuit malfunction
ECT or related circuit malfunction
MAF sensor or related circuit malfunction
IAT sensor No.1 or related circuit malfunction
IAT sensor No.2 or related circuit malfunction
Fuel pressure sensor or related circuit malfunction
Accelerator position sensor or related circuit malfunction
TP sensor or related circuit malfunction
Manifold absolute pressure (MAP) sensor or related circuit malfunction
Neutral or clutch switch malfunction
VSS or related circuit malfunction
Fuel line restriction
High pressure fuel pump malfunction
Fuel injector or related circuit malfunction
Incorrect fuel injection timing
Three-way catalytic converter (TWC) malfunction
Engine internal parts malfunction
Excessive carbon is built-up in combustion chamber
Improper engine compression
Improper valve timing
Injector driver module 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual.
  (See BEFORE REPAIR PROCEDURE ).
  
  (See AFTER REPAIR PROCEDURE ).
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.