NO.15 EMISSION COMPLIANCE [L8, LF, L5]

id010346802100

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 A/F sensor 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.
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.

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
Inspect 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 soiling
Are all items normal?
Yes
Go to the next step.
No
Service if necessary.
Repeat Step 1.
2
Connect the M-MDS to the DLC-2.
Switch the ignition to ON (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
Yes
DTC is displayed:
Go to appropriate DTC inspection.
(See DTC TABLE [L8, LF, L5].)
No
No DTC is displayed:
Go to the next step.
3
Is any other driveability concern present?
Yes
Go to appropriate symptom troubleshooting.
No
Go to the next step.
4
Connect the M-MDS to the DLC-2.
Access the ECT PID.
Warm up the engine and idle it.
Verify if the ECT PID is correct.
(See PCM INSPECTION [L8, LF, L5].)
Is the ECT PID correct?
Yes
Go to the next step.
No
Inspect for coolant leakage, and inspect the cooling fan and condenser fan operation or thermostat operation.
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, HEATED OXYGEN SENSOR (HO2S) INSPECTION [L8, LF, L5].)
Is the A/F sensor normal?
Yes
Go to the next step.
No
Inspect for followings:
•  Exhaust gas leakage between exhaust manifold and A/F sensor.
•  Loose installation of A/F sensor.
If there are no malfunctions detected, replace the A/F sensor
If there are malfunctions detected, repair or replace malfunctioning part.
(See EXHAUST SYSTEM REMOVAL/INSTALLATION [L8, LF, L5].)
7
Perform the spark test.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L8, LF, 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 spark test result.
8
Inspect the fuel line pressure.
(See FUEL LINE PRESSURE INSPECTION [L8, LF, L5].)
Is the fuel line pressure correct?
Yes
Go to the next step.
No
Low:
Inspect the fuel line for clogging.
If there is no malfunction, replace the fuel pump unit.
High:
Replace the fuel pump unit.
(See FUEL PUMP UNIT REMOVAL/INSTALLATION [L8, LF, L5].)
9
Remove and shake the PCV valve.
Does the PCV valve rattle?
Yes
Go to the next step.
No
Replace the PCV valve.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L8, LF, L5].)
10
Inspect for fuel saturation inside the charcoal canister.
Is there an excess amount of liquid fuel present in canister?
Yes
Replace the charcoal canister.
No
Inspect the fuel tank vent system.
Then, go to the next step.
(See FUEL TANK INSPECTION [L8, LF, L5].)
11
Visually inspect the exhaust system parts.
Are there any deformed exhaust system parts?
Yes
Replace the part.
No
Go to the next step.
12
Inspect the TWC.
(See EXHAUST SYSTEM INSPECTION [L8, LF, L5].)
Is the TWC normal?
Yes
Inspect the EGR system.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L8, LF, L5].)
No
Replace the TWC.
(See EXHAUST SYSTEM REMOVAL/INSTALLATION [L8, LF, L5].)
13
•  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 repair or diagnosis.
•  If the vehicle is repaired, troubleshooting is completed.
•  If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.