NO.15 EMISSION COMPLIANCE [L3]

BME010300000W17

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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual.
(See BEFORE REPAIR PROCEDURE [L3].)
(See AFTER REPAIR PROCEDURE [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.

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION

1
Inspect for 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 okay?
Yes
Go to next step.
No
Service as necessary.
Repeat Step 1.
2
Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and KOER DTCs.
Are there any DTCs displayed?
Yes

DTC is displayed:

Go to appropriate DTC test.
No

No DTC is displayed:

Go to next step.
3
Is any other driveability concern present?
Yes
Go to appropriate symptom troubleshooting.
No
Go to next step.
4
Connect WDS or equivalent to DLC-2.
Access ECT PID.
Warm up engine and run it at idle.
Verify ECT PID is correct.
Is ECT PID correct?
Yes
Go to next step.
No
Inspect for coolant leakage, cooling fan and condenser fan operation or thermostat operation.
5
Is strong blue spark visible at each disconnected high-tension lead while cranking engine?
Yes
Inspect for 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 malfunctioning parts.
If okay, go to next step.
No
Inspect following:
• High-tension leads
• Ignition coil and connector
6
Install fuel pressure gauge between fuel pipe and fuel distributor.
Start engine and run it at idle.
Measure fuel line pressure at idle.
Is fuel line pressure correct at idle?
Yes
Go to next step.
No

Zero or low:

Inspect for clogged fuel line.
If okay, replace fuel pump unit.

High:

Replace fuel pump unit.
7
Remove and shake PCV valve.
Does PCV valve rattle?
Yes
Go to next step.
No
Replace PCV valve.
8
Inspect for fuel saturation inside charcoal canister.
Is excess amount of liquid fuel present in canister?
Yes
Replace charcoal canister.
No
Inspect fuel tank vent system.
Then, go to next step.
9
Is there restriction in exhaust system?
Yes
Inspect exhaust system.
No
Inspect EGR system.
10
Inspect threeway catalytic converter.
Is threeway catalytic converter okay?
Yes
Inspect EGR system.
No
Replace threeway catalytic converter.
11
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.