No. 15 Emission Compliance: Notes

POSSIBLE CAUSE DESCRIPTION CHART

15	EMISSION COMPLIANCE
DESCRIPTION	Fails emissions test.
POSSIBLE CAUSE	Vacuum lines leakage or blockage Cooling system malfunction Spark plug malfunction Leakage from intake manifold Erratic or no signal from CMP sensor Inadequate fuel pressure PCV valve malfunction or incorrect valve installation EGR valve malfunction Exhaust system clogging Fuel tank ventilation system malfunction Fuel-filler cap malfunction Charcoal canister damage Air cleaner element clogging or restriction Throttle body malfunction Erratic signal to ignition coil Improper air/fuel mixture ratio control operation Bend or open circuit HO2S wiring harness Catalyst converter malfunction Engine internal parts malfunction Excessive carbon is built up in combustion chamber Improper engine compression Improper valve timing WARNING: The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read following warnings before servicing fuel system: 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 injuries 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 quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean 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

Vacuum lines leakage or blockage
Cooling system malfunction
Spark plug malfunction
Leakage from intake manifold
Erratic or no signal from CMP sensor
Inadequate fuel pressure
PCV valve malfunction or incorrect valve installation
EGR valve malfunction
Exhaust system clogging
Fuel tank ventilation system malfunction
Fuel-filler cap malfunction
Charcoal canister damage
Air cleaner element clogging or restriction
Throttle body malfunction
Erratic signal to ignition coil
Improper air/fuel mixture ratio control operation
Bend or open circuit HO2S wiring harness
Catalyst converter malfunction
Engine internal parts malfunction
Excessive carbon is built up in combustion chamber
Improper engine compression
Improper valve timing

WARNING: The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read following warnings before servicing fuel system:

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 injuries 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 quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.