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P0455


DTC P0455 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED (GROSS LEAK)





WIRING DIAGRAM

CIRCUIT DESCRIPTION
An evaporative emission control system is used to prevent emission of fuel vapor. The vapor generated in the fuel tank while driving or the engine at a stop passes through a tank pressure control valve and enters the EVAP canister where the charcoal absorbs and stores the fuel vapor. EVAP canister is purged or cleaned in the same way as EVAP control system for vehicle not equipped with tank pressure control solenoid vacuum valve. Tank pressure control valve operates as follows: As tank pressure control solenoid vacuum valve closes under the following either condition, vapor passage of tank pressure control valve also closes.
- Engine stops or
- Engine is running, vehicle stops and fuel level is higher than specified.
Therefore, when the pressure of the vapor generated in the fuel tank increases higher than specified pressure, it pushes open the tank pressure control valve and enters EVAP canister. However, under the conditions that the engine is running and the fuel level is lower than the specified level (or vehicle is running and fuel level is higher than the specified level), tank pressure control solenoid vacuum valve is turned ON by ECM and vacuum is applied to the diaphragm of tank pressure control valve. Thus, the vapor passage of tank pressure control valve opens to allow continuity between the fuel tank and EVAP canister. The EVAP canister air valve and the fuel tank pressure sensor are installed so that ECM diagnoses leakage of the fuel vapor from the evaporative emission control system. The EVAP canister air valve is usually open but it is closed by ECM when checking such leakage.






DETECTING CONDITION

DTC CONFIRMATION PROCEDURE

WARNING:
- When performing a road test, select a place where there is no traffic or possibility of a traffic accident and be very careful during testing to avoid occurrence of an accident.
- Road test should be carried out with 2 persons, a driver and a tester, on a level road.

1) Turn ignition switch OFF
2) Clear DTC with ignition switch ON.
3) Check vehicle and environmental condition for:
- Indication of fuel level meter in combination meter: within 1/4-3/4
- Altitude (barometric pressure): 2400m, 8000ft or less (560mmHg, 75kPa or more)
- Ambient temp.: -10°C, l4°For higher
- Intake air temp.: 70°C, 158°F or lower
- Engine coolant temp.: 70 - 110°C, 158 - 230°F
4) Drive vehicle under usual driving condition, driving at 30-40mph (50-60km/h) including short stop to traffic signal (under driving condition other than high-load, high-engine speed, rapid accelerating and decelerating), for 20min.
5) Keep vehicle speed at 30-40mph, 50-60km/h and hold throttle valve at that opening position for 3 min.
6) Stop vehicle (do not turn ignition switch OFF) and confirm test results according to "Test Result Confirmation Flow Table."








INSPECTION

WARNING: This work must be performed in a well ventilated area and away from any open flames such as gas hot water.











EVAP Canister Purge Valve and Its Circuit Inspection
When using SUZUKI scan tool:
1) Connect SUZUKI scan tool to DLC with ignition switch OFF and disconnect vacuum hoses from canister.
2) Turn ignition switch ON, clear DTC and select "MISC TEST" mode on SUZUKI scan tool.

When not using SUZUKI scan tool:
1) Disconnect vacuum hoses from canister.
2) Turn ignition switch ON.
Using service wire, ground C21-7 terminal of ECM connector (valve ON) and unground it (valve OFF).
3) Check purge valve for operation and vacuum passage for clog when valve is switched ON and OFF by using SUZUKI scan tool or service wire.
Valve OFF: When blowing into hose "A," air should not come out of hose"B."
Valve ON : When blowing into hose "A," air should come out of hose"B."
If check result is not described, check vacuum hoses, purge valve, wire harness and connections.

















EVAP Canister Purge Valve Inspection
1) With ignition switch OFF, disconnect coupler from canister purge valve.
2) Check resistance of EVAP canister purge valve.

Resistance between two terminals : 30 - 34ohms at 20°C (68°F)

Resistance between terminal and body :1 Mohms or higher

If resistance is as specified, proceed to next operation check. If not, replace.
3) Disconnect vacuum hoses.
4) With coupler disconnected, blow into hose "A." Air should not come out of hose "B."
5) Connect 12V-battery to EVAP canister purge valve terminals. In this state, blow hose "A." Air should come out of hose "B."

WARNING: Do not suck the air through valve. Fuel vapor inside valve is harmful.

If check result is not described, replace purge valve.

Tank Pressure Control Solenoid Valve and Its Circuit Inspection
When using SUZUKI scan tool:
1) Disconnect hose from tank pressure control valve.
2) Connect SUZUKI scan tool to DLC with ignition switch OFF.
3) Turn ignition switch ON, clear DTC and select "MISC JEST" mode on SUZUKI scan tool.

When not using SUZUKI scan tool:
1) Disconnect hose from tank pressure control valve.
2) Turn ignition switch ON.
3) Using service wire, ground C21-16 terminal of ECM connector (valve ON) and unground it (valve OFF).
4) Check solenoid vacuum valve for operation and vacuum passage for clog and leakage when valve is switched ON and OFF by SUZUKI scan tool or service wire.
Valve OFF: When blowing into hose "A," air should come out of filter and not enter into intake manifold.
Valve ON : When blowing into hose "A," air should enter into intake manifold and not out of filter.
If check result is not described, check vacuum hoses, solenoid vacuum valve, wire harness and connections.

















EVAP Canister Air Valve and Its Circuit Inspection
When using SUZUKI scan tool:
1) Disconnect canister air valve hose from canister.
2) Connect SUZUKI scan tool to DLC with ignition switch OFF.
3) Turn ignition switch ON, clear DTC and select "MISC TEST" mode on SUZUKI scan tool.

When not using SUZUKI scan tool:
1) Disconnect canister air valve hose from canister.
2) Turn ignition switch ON.
3) Using service wire, ground C21-3 terminal of ECM connector (valve ON) and unground it (valve OFF).
4) Check canister air valve for operation and hose for clog when valve is switched ON and OFF by SUZUKI scan tool or service wire.
Valve OFF: When blowing into hose "A," air should come out of hoses "B." A
Valve ON : When blowing into hose "A," air should not come out of hose "B."
If check result is not described, check hose, canister air valve, wire harness and connections.

EVAP Leakage Inspection
1) Disconnect purge hose from intake manifold and tank pressure control valve hose from solenoid vacuum valve.
2) Plug EVAP canister air valve hose end.
3) Connect SUZUKI scan tool to DLC with ignition switch OFF
4) Open EVAP canister purge valve using "MISC TEST" mode on SUZUKI scan tool or grounding C21 -7 terminal of ECM connector.
5) While observing tank pressure displayed on SUZUKI scan tool, connect vacuum pump gauge to disconnected tank pressure control valve hose end. And apply vacuum to tank pressure control valve.
6) Apply 3.5 kPa (14.0 in Aq, 26.0 mmHg) to purge hose and seal it.
After 15 sec., check to make sure that pressure is higher than 3.3 kPa (13.6 in Aq, 24.5 mmHg).
If check result is not satisfactory, locate pressure leaking point by using soap water or leak detector.
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