NO.14 EMISSION COMPLIANCE [F2]

id010394850700

14

EMISSION COMPLIANCE
DESCRIPTION
Fails emissions test.
POSSIBLE CAUSE
•  Vacuum lines leakage or blockage
•  Cooling system malfunction
•  Spark plug malfunction
•  Leakage from intake manifold
•  Inadequate fuel pressure
•  PCV valve malfunction or incorrect valve installation
•  Exhaust system clogging
•  Fuel tank ventilation system malfunction
•  Charcoal canister damage
•  Excessive carbon is built up in combustion chamber
•  Improper engine compression
•  Improper valve timing
Warning
•  The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the 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 the “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual.

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 normal?
Yes
Go to the next step.
No
Service if necessary.
Repeat Step 1.
2
Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
Yes
DTC is displayed:
•  Go to appropriate the DTC inspection.
No
No DTC is displayed:
•  Inspect instrument cluster operation.
3
Is any other drivability concern present?
Yes
Go to appropriate symptom troubleshooting.
No
Go to the next step.
4
Connect the M-MDS to the DLC-2.
Access ECT PID.
Warm-up the engine and idle it.
Verify ECT PID is correct.
(See PCM INSPECTION [F2].)
Is ECT PID correct?
Yes
Go to the next step.
No
Inspect for coolant leakage, cooling fan and thermostat operation.
5
Is strong blue spark visible at each disconnected high-tension lead while cranking engine?
Yes
Inspect for the following:
•  Spark plug malfunction
Repair or replace malfunctioning parts.
If normal, go to the next step.
No
Inspect for the following:
•  High-tension leads
•  Ignition coil and connector
6
Install fuel pressure gauge between fuel main pipe and fuel distributor.
Start engine and run it at idle.
Measure fuel line pressure at idle.
Is fuel line pressure correct at idle?
(See FUEL PUMP UNIT INSPECTION [F2].)
Yes
Go to the next step.
No
Zero or low:
Inspect the fuel pump circuit.
Inspect for the open fuel pump relief valve.
Inspect for the fuel leakage inside pressure regulator.
Inspect for the clogged main fuel line.
High:
Inspect the pressure regulator for high pressure cause.
Inspect for the clogged fuel return line.
7
Does fuel line pressure remain at specification for 60 s when ignition switch is turned on?
(See FUEL PUMP UNIT INSPECTION [F2].)
Yes
Go to the next step.
No
Inspect pressure regulator for high pressure cause.
8
Remove and shake the PCV valve.
Does the PCV valve rattle?
Yes
Go to the next step.
No
Replace the PCV valve.
9
Is there restriction in the exhaust system?
Yes
Inspect exhaust system.
No
Go to the next step.
10
Inspect for fuel saturation inside charcoal canister.
Is excessive amount of liquid fuel present in canister?
Yes
Replace charcoal canister.
No
Inspect fuel tank vent system.
11
•  Verify test results.
―  If normal, return to diagnostic index to service any additional symptoms.
―  If malfunction remains, inspect related Service Information and perform repair or diagnosis.
•  If vehicle is repaired, troubleshooting completed.
•  If vehicle is not repaired or additional diagnostic information is not available, replace the PCM.