Emission Compliance [PYUL]: Outline
WARNING: This page is about a different variant/trim than selected.
EMISSION COMPLIANCE (PYUL) DESCRIPTION AND POSSIBLE CAUSE
| Troubleshooting item |
Emission compliance |
| Description |
Fails emissions test. |
| Possible cause |
- Engine overheating
- Cooling system malfunction
- PCM detects DTCs
- Incorrect fuel injection timing
- Ignition timing malfunction
- Spark plug malfunction
- Ignition coil malfunction
- CMP sensor malfunction
- CKP sensor malfunction
- Purge solenoid valve malfunction
- Inadequate fuel pressure (high or low pressure side)
- Fuel leakage at the fuel line and/or fuel injector
- Fuel pressure sensor or related wiring harness malfunction
- High pressure fuel pump malfunction
- Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system)
- Spill valve control solenoid valve malfunction (built-into high pressure fuel pump)
- Relief valve (built-into high pressure fuel pump) malfunction
- Fuel line restriction
- Fuel pump unit malfunction
- Air leakage from intake-air system
- Vacuum leakage
- Intake-air system restriction
- Charcoal canister (damage, overflow)
- Improper engine coolant level
- Excessive carbon built-up in combustion chamber
- Engine compression pressure malfunction
- Improper intake valve timing
- Improper exhaust valve timing
- Exhaust system and/or TWC restricted
- Exhaust system leakage
- TWC malfunction (PCM DTC is stored).
- Positive crankcase ventilation system malfunction
- PCV valve malfunction
- Incorrect PCV valve installation
- Clogging in positive crankcase ventilation system hoses (PCV valve hose, ventilation hose)
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.
- Highly pressurized fuel may spray out if the fuel line is cut. Due to the following dangers occurring with a fuel spray, always complete the [Fuel Line Safety Procedure] to prevent the fuel from spraying. (Refer to [ BEFORE SERVICE PRECAUTION
] in Service Information.)
- Fuel may cause irritation if it comes in contact with skin and eyes.
- If fuel ignites and causes a fire, it may lead to serious injury or death, and damage to property and facilities.
- Fuel is highly flammable and dangerous. Fuel line spills and leakage can cause serious injury or death, and damage to equipment. Always Refer to [ QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION (FUEL SYSTEM)
] before performing the fuel hose installation, and execute the [Fuel Leakage Inspection] after installation. (Refer to [ QUICK RELEASE CONNECTOR (FUEL SYSTEM) REMOVAL/INSTALLATION
] in Service Information). (Refer to [ AFTER SERVICE PRECAUTION
] in Service Information.)
CAUTION:
- Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.
|
| System wiring diagram |
Not applicable |