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Home >> Suzuki >> 2006 >> Aerio Base, FWD, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> Diagnostic Information and Procedures >> DTC P0449: Evaporative Emission System Vent Valve / Solenoid Circuit >> DTC Troubleshooting
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DTC Troubleshooting

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

Step Action YES NO
1  Was "Engine and Emission Control System Check" performed?  Go to Step 2. Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK .
2  Do you have SUZUKI scan tool?  Go to Step 3. Go to Step 4.
3 
  1. Check EVAP canister vent valve circuit.

  1. Connect SUZUKI scan tool to DLC with ignition switch turned OFF.
  2. Turn ON ignition switch, clear DTC and select "MISC TEST" mode on SUZUKI scan tool.
  3. Check voltage at "G04-5" terminal of ECM connector connected to ECM when vent valve is turned ON and OFF by SUZUKI scan tool.

"G04-5" terminal voltage 
Voltage at vent valve OFF:10 - 14 V 
Voltage at vent valve ON: 0 - 1 V 
Is check result satisfactory? 		 Intermittent trouble or faulty ECM.
Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .		 Go to Step 5.
4 
  1. Check EVAP canister vent valve circuit.

  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Check for proper connection to vent valve at "G04- 5" terminal of ECM connector.
  3. If OK, measure voltage at "G04-5" terminal of ECM connector disconnected with ignition switch turned ON.

Is voltage 10 -14 V? 		 Intermittent trouble or faulty ECM.
Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .		 Go to Step 5.
5 
  1. Check EVAP canister vent valve for operation referring to EVAP LEAK CHECK MODULE INSPECTION (VEHICLE WITH ORVR SYSTEM) .

Is check result satisfactory? 		 "BLU/WHT" or "BLK/RED" circuit wire is open or short. If wire and connections are OK, substitute a known-good ECM and recheck. Replace EVAP leak check module.
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