NO.15 EMISSION COMPLIANCE [LF, 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 (Unleaded gasoline model) • 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 • Catalytic converter malfunction • Engine internal parts malfunction • Excessive carbon is built up in combustion chamber • Improper engine compression • Improper valve timing • Improper adjustment of variable resister (Leaded gasoline model) 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [LF, L3].) (See AFTER REPAIR PROCEDURE [LF, L3].) Caution • Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and the quick release connector. Always clean the 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 dirt. • Variable resister adjustment (Leaded gasoline model) (See Leaded Fuel Models) 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 any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC test.
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.
3	Is any other driveability concern present?	No	Go to the next step.
4	Connect the WDS or equivalent to the DLC-2. Access the ECT PID. Warm up the engine and run it at idle. Verify that the ECT PID is correct. (See PCM INSPECTION [LF, L3].) Is the ECT PID correct?	Yes	Go to the next step.
4		No	Inspect for coolant leakage, cooling fan and condenser fan operation, or thermostat operation.
5	Is a strong blue spark visible at each disconnected high-tension lead while cranking the engine?	Yes	Inspect for the following: • Spark plugs malfunction • Improperly installed CMP sensor • Damage to 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 parts. 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 the fuel line pressure at idle. Is the fuel line pressure correct at idle? (See FUEL LINE PRESSURE INSPECTION [LF, L3])	Yes	Go to the next step.
6		No	Zero or low: Inspect for a clogged fuel line. If normal, replace the fuel pump unit. High: Replace the fuel pump unit.
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 an excess amount of liquid fuel present in the canister?	Yes	Replace the charcoal canister.
8		No	Inspect the fuel tank vent system. Then, go to the next step. (Unleaded gasoline model) Then, go to Step 10.
9	Inspect the EGR system. (See EGR Control System Inspection (Unleaded Fuel Models).)	Yes	Go to the next step.
9		No	Replace the malfunctioning parts.
10	Inspect the threeway catalytic converter. Is the threeway catalytic converter normal?	Yes	Inspect for restriction in the exhaust system.
10		No	Replace the threeway catalytic converter.
11	Verify the test results. • If normal, return to the diagnostic index to service any additional symptoms. • If the malfunction remains, replace the PCM.