NO.15 EMISSION COMPLIANCE [L5]

15	EMISSION COMPLIANCE
DESCRIPTION	• Fails emissions test.
POSSIBLE CAUSE	• Electrical connector disconnection • Intake air system and air cleaner element malfunction • Vacuum lines leakage or blockage • PCM DTC is stored • Cooling system malfunction • Fuel-filler cap malfunction • A/F sensor malfunction • Spark plug malfunction • Ignition system improper operation • Erratic or no signal from CMP sensor • Excessive or insufficient fuel pressure ― Fuel pump relay or fuel pump circuit malfunction ― Clogging fuel line ― Pressure regulator malfunction (built-in fuel pump unit) ― Fuel pump unit malfunction • Charcoal canister malfunction • Exhaust system clogging • TWC malfunction • EGR system malfunction • Base engine malfunction • Improper engine compression • Improper valve timing • PCV valve malfunction Warning • The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the 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 [L5].) (See AFTER SERVICE PRECAUTION [L5].) Caution • Disconnecting/connecting the quick release connector without cleaning it may 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.

EMISSION COMPLIANCE

DESCRIPTION

• Fails emissions test.

POSSIBLE CAUSE

• Electrical connector disconnection

• Intake air system and air cleaner element malfunction

• Vacuum lines leakage or blockage

• PCM DTC is stored

• Cooling system malfunction

• Fuel-filler cap malfunction

• A/F sensor malfunction

• Spark plug malfunction

• Ignition system improper operation

• Erratic or no signal from CMP sensor

• Excessive or insufficient fuel pressure

― Fuel pump relay or fuel pump circuit malfunction

― Clogging fuel line

― Pressure regulator malfunction (built-in fuel pump unit)

― Fuel pump unit malfunction

• Charcoal canister malfunction

• Exhaust system clogging

• TWC malfunction

• EGR system malfunction

• Base engine malfunction

• Improper engine compression

• Improper valve timing

• PCV valve malfunction

Warning

• The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the 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 [L5].) (See AFTER SERVICE PRECAUTION [L5].)

Caution

• Disconnecting/connecting the quick release connector without cleaning it may 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 the following: • Electrical connections • Intake air system and air cleaner element concerns: obstructions, leakage or soiling • Proper maintenance schedule followed • Vacuum lines for leakage or blockage Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results. Repeat Step 1.
No	Go to the next step.
2	Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L5].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L5].)
No	Go to the next step.
3	Is any other driveability concern present?	Yes	Go to the appropriate symptom troubleshooting. (See SYMPTOM DIAGNOSTIC INDEX [L5].)
No	Go to the next step.
4	Access the ECT PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L5].) Drive the vehicle while monitoring the ECT PID. Is the ECT PID value within the specification? (See PCM INSPECTION [L5].)	Yes	Go to the next step.
No	Inspect for coolant leakage, and inspect the cooling fan and condenser fan operations or and inspect the thermostat operation. Repair or replace the malfunctioning part according to the inspection results.
5	Inspect the fuel-filler cap. Is there any leakage at the fuel-filler cap?	Yes	Replace the fuel-filler cap.
No	Go to the next step.
6	Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L5].) Is there any malfunction?	Yes	Inspect for followings: • Exhaust gas leakage between exhaust manifold and A/F sensor • Loose installation of A/F sensor ― If there is no malfunction: • Replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L5].) ― If there is a malfunction: • Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
7	Perform the Spark Test. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].) Is a strong blue spark visible at each cylinder?	Yes	Go to the next step.
No	Repair or replace the malfunctioning part according to the inspection results.
8	Inspect the fuel line pressure. (See FUEL LINE PRESSURE INSPECTION [L5].) Is there any malfunction?	Yes	Zero or low: • Inspect the fuel pump relay and the fuel pump circuit. (See RELAY INSPECTION [L5].) • Inspect the fuel line for clogging. ― If there is a malfunction: • Repair or replace the malfunctioning part according to the inspection results. ― If there is no malfunction: • Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5].) High: • Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5].)
No	Go to the next step.
9	Inspect for fuel saturation inside the charcoal canister. Is there an excess amount of liquid fuel present in canister?	Yes	Replace the charcoal canister. (See CHARCOAL CANISTER REMOVAL/INSTALLATION [L5].)
No	Inspect the fuel tank vent system, then go to the next step. (See FUEL TANK INSPECTION [L5].)
10	Visually inspect the exhaust system parts. Are there any deformed exhaust system parts?	Yes	Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
11	Inspect the TWC. (See EXHAUST SYSTEM INSPECTION [L5].) Is there any malfunction?	Yes	Replace the TWC. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [L5].)
No	Go to the next step.
12	Perform the EGR Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
13	Inspect the engine compression. (See COMPRESSION INSPECTION [L5].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
14	Inspect the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [L5].) Is there any malfunction?	Yes	Replace the PCV valve and the oil separator as a single unit, then go to the next step. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L5].)
No	Inspect the valve timing. (See TIMING CHAIN REMOVAL/INSTALLATION [L5].) Repair or replace the malfunctioning part according to the inspection results.
15	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [L5].) • If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis. ― If the vehicle is repaired, troubleshooting is completed. ― If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.

STEP

INSPECTION

RESULTS

ACTION

Inspect the following:

• Electrical connections

• Intake air system and air cleaner element concerns: obstructions, leakage or soiling

• Proper maintenance schedule followed

• Vacuum lines for leakage or blockage

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Repeat Step 1.

Go to the next step.

Perform the PCM DTC inspection using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [L5].)

Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [L5].)

Go to the next step.

Is any other driveability concern present?

Yes

Go to the appropriate symptom troubleshooting.

(See SYMPTOM DIAGNOSTIC INDEX [L5].)

Go to the next step.

Access the ECT PID using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [L5].)

Drive the vehicle while monitoring the ECT PID.

Is the ECT PID value within the specification?

(See PCM INSPECTION [L5].)

Yes

Go to the next step.

Inspect for coolant leakage, and inspect the cooling fan and condenser fan operations or and inspect the thermostat operation.

Repair or replace the malfunctioning part according to the inspection results.

Inspect the fuel-filler cap.

Is there any leakage at the fuel-filler cap?

Yes

Replace the fuel-filler cap.

Go to the next step.

Inspect the A/F sensor.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L5].)

Is there any malfunction?

Yes

Inspect for followings:

• Exhaust gas leakage between exhaust manifold and A/F sensor

• Loose installation of A/F sensor

― If there is no malfunction:

• Replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L5].)

― If there is a malfunction:

• Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Perform the Spark Test.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)

Is a strong blue spark visible at each cylinder?

Yes

Go to the next step.

Repair or replace the malfunctioning part according to the inspection results.

Inspect the fuel line pressure.

(See FUEL LINE PRESSURE INSPECTION [L5].)

Is there any malfunction?

Yes

Zero or low:

• Inspect the fuel pump relay and the fuel pump circuit. (See RELAY INSPECTION [L5].)

• Inspect the fuel line for clogging.

― If there is a malfunction:

• Repair or replace the malfunctioning part according to the inspection results.

― If there is no malfunction:

• Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5].)

High:

• Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5].)

Go to the next step.

Inspect for fuel saturation inside the charcoal canister.

Is there an excess amount of liquid fuel present in canister?

Yes

Replace the charcoal canister.

(See CHARCOAL CANISTER REMOVAL/INSTALLATION [L5].)

Inspect the fuel tank vent system, then go to the next step.

(See FUEL TANK INSPECTION [L5].)

Visually inspect the exhaust system parts.

Are there any deformed exhaust system parts?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Inspect the TWC.

(See EXHAUST SYSTEM INSPECTION [L5].)

Is there any malfunction?

Yes

Replace the TWC.

(See EXHAUST SYSTEM REMOVAL/INSTALLATION [L5].)

Go to the next step.

Perform the EGR Control System Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Inspect the engine compression.

(See COMPRESSION INSPECTION [L5].)

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Inspect the PCV valve.

(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [L5].)

Is there any malfunction?

Yes

Replace the PCV valve and the oil separator as a single unit, then go to the next step.

(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L5].)

Inspect the valve timing.

(See TIMING CHAIN REMOVAL/INSTALLATION [L5].)

Repair or replace the malfunctioning part according to the inspection results.

Verify test results.

• If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [L5].)

• If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis.

― If the vehicle is repaired, troubleshooting is completed.

― If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.