P0443

DTC P0443 EVAP CONTROL SYSTEM INCORRECT PURGE FLOW





SYSTEM DIAGRAM






WIRING DIAGRAM






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.

NOTE: Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION PROCEDURE.
- Intake air temp. or intake air temp. at start: higher than -7°C (19°F)
- Engine coolant temp. at start: higher than -7°C (19°F)
- Atmospheric pressure: higher than 570 mmHg (Altitude: lower than 2360 m (7740 ft))
- Power steering pressure switch : OFF

(1) Connect scan tool to DLC with ignition switch OFF.
(2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data in ECM memory by using scan tool and start engine.
(3) Increase vehicle speed to 56km/h (35mph) or more.
(4) Keep driving above vehicle speed for 20 mm (Change of vehicle speed is permitted in this step).
(5) Stop vehicle and run engine at idle speed for 2min.
(6) Check pending DTC by using scan tool.





TROUBLESHOOTING





Canister Purge System Check
1) Hoist vehicle so that rear wheels rotate freely.
2) Set M/T or A/T in "Neutral" and transfer in "2H".
3) Start engine, release parking brake lever and check that rear propeller shaft (tires) is turning.
If not, perform following check with one rear tire locked and the other turned by hand.

WARNING: Make sure that M/T or A/T is set to "Neutral" position for this check. If it is set to any other position, rear tires will turn at high speed and a very dangerous situation may occur.

4) Warm up engine to normal operating temperature.

NOTE: Warming up by idling only (i.e., the engine speed is not raised very high) may result in vacuum not being detected in the following inspection. Also, if the ignition switch has been turned OFF after engine warm up, purging can not be performed for a specified time even with the engine started again.
Therefore, to ensure accurate result of EVAP canister purge inspection, warm up the engine fully, turn OFF the ignition switch once, restart it and keep it running at 2,000 rpm for about 3 minutes before performing the inspection.

5) Disconnect purge hose from EVAP canister.
6) Place finger against the end of disconnected hose and check that vacuum is not felt there when engine is running at idle speed.
7) Also check that vacuum is felt when engine speed is increased to higher than about 1,500 r/min.





Vacuum Passage Inspection
Start engine and run it at idle speed. With finger placed against vacuum nozzle, check that vacuum is applied.
If it is not applied, clean vacuum passage by blowing compressed air.





Vacuum Hose Inspection
Check hoses for connection, leakage, clog and deterioration.
Replace as necessary.





EVAP Canister Purge Value And Its Circuit Check
1) Disconnect vacuum hoses from intake manifold and EVAP canister.
2) With ignition switch ON, blow into hose "A". Air should not come out of hose "B".





Using SUZUKI scan tool
3) Connect SUZUKI scan tool to DLC with ignition switch OFF.
3-1) Turn ON EVAP canister purge valve by using SUZUKI scan tool with ignition switch ON.
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 results are as describe above, EVAP canister purge valve and its circuit are in good condition, connect vacuum hoses securely.
If not, proceed to step 4).





Not using SUZUKI scan tool
3) Using a service wire, connect E33-25 (E172-25) terminal of ECM coupler and body ground with ignition switch OFF.
3-1) Turn ON ignition switch.
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 results are as described above and E33-25 (E172-25) terminal to ECM connection is OK, EVAP canister purge valve and its circuit are in good condition, connect vacuum hoses securely.
If not, proceed to step 4).





4) With ignition switch OFF, disconnect coupler from EVAP canister purge valve.
5) Check resistance between two terminals of EVAP canister purge valve.

Resistance of EVAP canister purge valve:
28-36 Ohms at 20°C (68°F)

If resistance is as specified, proceed to next operation check. If not, replace.





6) Disconnect vacuum hoses from intake manifold and EVAP canister.
7) With coupler disconnected, blow into hose "A". Air should not come out of hose "B".





8) Connect 12V-battery to solenoid 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 as specified above, check EVAP canister purge valve harness.
If not, replace EVAP canister purge valve.





EVAP Canister Inspection
1) Disconnect vacuum hoses from EVAP canister.
2)
- When air is blown into tank pipe, there should be no restriction of flow through purge pipe and air pipe.
- When air is blown into purge pipe, air should not pass through either tank pipe or air pipe.
3) If operation differs from above description, EVAP canister must be replaced.
4) Connect hoses to canister.