NO.15 EMISSION COMPLIANCE [L3]


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 • Charcoal canister damage • Air cleaner element clogging or restriction • Throttle body malfunction • Spark leakage from high-tension leads • Improper air/fuel mixture ratio control operation • 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 performing 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 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 [L3].) (See AFTER SERVICE PRECAUTION [L3].) Caution • Disconnecting/connecting quick release connector without cleaning it may possibly 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.


STEP	INSPECTION	RESULTS	ACTION
1	Inspect for the following: • Vacuum lines for leakage or blockage • Electrical connections • Proper maintenance schedule followed • Intake-air system and air cleaner element concerns: obstructions, leakage or dirtiness Are all items normal?	Yes	Go to the next step.
1		No	Service if necessary. Repeat Step 1.
2	Connect the WDS or equivalent to the DLC-2. Retrieve any continuous memory, KOEO and KOER DTCs. Are there any DTCs displayed?	Yes	DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE [L3].)
2		No	No DTC is displayed: Go to the next step.
3	Is any other driveability concern present?	Yes	Go to the appropriate symptom troubleshooting. (See ENGINE SYMPTOM TROUBLESHOOTING [L3].)
3	Is any other driveability concern present?	No	Go to the next step.
4	Connect the WDS or equivalent to the DLC-2. Access ECT PID. Warm up the engine and run it at idle. Verify ECT PID is correct. (See PCM INSPECTION [L3].) Is ECT PID correct?	Yes	Go to the next step.
4		No	Inspect for coolant leakage, the cooling fan and condenser fan operation or the thermostat operation.
5	Is strong blue spark visible at each disconnected high-tension lead while cranking engine?	Yes	Inspect for the following: • Spark plugs malfunction • Improperly installed CMP sensor • Damage of trigger wheel on camshaft • Open or short circuit on CMP sensor • Open or short circuit between CMP sensor and PCM terminal 2J or 2M Repair or replace the malfunctioning part. If normal, go to the next step.
5		No	Inspect the following: • High-tension leads • Ignition coil and connector
6	Install a fuel pressure gauge between the fuel pipe and the fuel distributor. Start the engine and run it at idle. Measure fuel line pressure at idle. Is fuel line pressure correct at idle? (See FUEL LINE PRESSURE INSPECTION [L3].)	Yes	Go to the next step.
6		No	Zero or low: Inspect for clogged fuel line. If normal, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L3].) High: Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L3].)
7	Remove and shake the PCV valve. Does the PCV valve rattle?	Yes	Go to the next step.
7	Remove and shake the PCV valve. Does the PCV valve rattle?	No	Replace the PCV valve.
8	Inspect for fuel saturation inside the charcoal canister. Is excess amount of liquid fuel present in the charcoal canister?	Yes	Replace the charcoal canister.
8		No	Inspect the fuel tank vent system. Then, go to the next step.
9	Is there restriction in the exhaust system?	Yes	Inspect the exhaust system.
9	Is there restriction in the exhaust system?	No	Inspect the EGR system. (See EGR Control System Inspection.)
10	Inspect the three-way catalytic converter. (See THREE-WAY CATALYTIC CONVERTER (TWC) INSPECTION [L3].) Is the three-way catalytic converter normal?	Yes	Inspect the EGR system. (See EGR Control System Inspection.)
10		No	Replace the three-way catalytic converter.
11	Verify test results. • If normal, return to diagnostic index to service any additional symptoms. • If malfunction remains, replace PCM.