NO.15 EMISSION COMPLIANCE


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 signal from eccentric shaft position sensor • Inadequate fuel pressure • Exhaust system clogging • Fuel tank ventilation system malfunction • Charcoal canister damage • Air cleaner element clogging or restriction • Throttle body malfunction • Jet air mixing system line blockage • 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 – Engine internal malfunction – Abnormal engine oil condition (viscosity, deterioration) – Low oil pressure – Excessive fuel pressure – Air mixed in oil line – Metering oil pump malfunction • Leakage or clogging in oil pipe • Leakage or clogging in oil nozzle Warning The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read the 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE.) (See AFTER REPAIR PROCEDURE.) 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 • Jet air mixing system line blockage • Electrical connections • Proper maintenance schedule followed • Intake-air system and air cleaner element concerns: obstructions, leakage or dirtiness Are all the 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.)
2		No	No DTC is displayed: Go to the next step.
3	Is any other drivability concern present?	Yes	Go to the applicable symptom troubleshooting. (See ENGINE SYMPTOM TROUBLESHOOTING.)
3	Is any other drivability 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 the ECT PID is correct. (See PCM INSPECTION.) Is the ECT PID correct?	Yes	Go to the next step.
4		No	Inspect for coolant leakage, cooling 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 eccentric shaft position sensor • Damaged trigger wheel on eccentric shaft • Open or short circuit on the eccentric shaft position sensor • Open or short circuit between the eccentric shaft position sensor and PCM terminal 2U or 2X 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 the fuel pressure gauge to the fuel line quick release connector. 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.)	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.) High: Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION.)
7	Inspect for fuel saturation inside the charcoal canister. Is there an excess amount of liquid fuel present in the canister?	Yes	Replace the charcoal canister.
7		No	Inspect the fuel tank vent system. Then, go to the next step.
8	Inspect for restriction and leakage at the three-way catalytic converter. Is there any restriction or leakage at the three-way catalytic converter?	Yes	Go to the next step.
8		No	Replace the three-way catalytic converter.
9	Inspect the engine compression. (See COMPRESSION INSPECTION.) Is it normal?	Yes	Visually inspect the exhaust system part.
9		No	Go to the next step.
10	Perform the metering oil pump control inspection. (See Metering Oil Pump Control Inspection.) Does the metering oil pump control operate properly?	Yes	Go to the next step.
10		No	Repair or replace the malfunctioning part according to the inspection results. After that overhaul or replace the engine. (See Engine Workshop Manual.)
11	Check the engine oil condition. Is the engine oil low viscosity and/or is there a gasoline odor?	Yes	Replace the engine oil. Inspect the ECT sensor and the related wiring harnesses. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION.) After that overhaul or replace the engine. (See Engine Workshop Manual.)
11		No	Go to the next step.
12	Inspect the oil pressure. (See OIL PRESSURE INSPECTION.) Is the oil pressure within the specification?	Yes	Go to the next step.
12		No	Repair or replace the malfunctioning part according to the inspection results. After that overhaul or replace the engine. (See Engine Workshop Manual.)
13	Check the oil pipe between the metering oil pipe and the metering oil nozzle. Is there any air and/or clogging in the oil pipe?	Yes	Inspect and repair for leakage and/or clogging in the oil passage at engine. After that overhaul or replace the engine. (See Engine Workshop Manual.)
13		No	Overhaul or replace the engine. (See Engine Workshop Manual.)
14	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis.