LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2005 >> Aerio SX, FWD, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> DTC P0448: Evaporative Emission Control System Vent Control Circuit Shorted >> Diagnostic Trouble Codes Troubleshooting
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Trouble Codes Troubleshooting

WARNING: In order to reduce risk of fire and personal injury, this work must be performed in a well ventilated area and away from any open flames such as gas hot water.
DTC TROUBLESHOOTING

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 Check EVAP canister vent valve power supply circuit 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Disconnect connector from EVAP canister vent valve.
  3. Turn ON ignition switch, measure voltage between vehicle body ground and "G04-5" terminal of ECM connector.

Is it voltage 0 V? 		 Go To Step 3. "BLK/RED" wire shorted to power supply circuit and faulty ECM.
3 Check EVAP canister vent valve 
  1. Check EVAP canister vent valve referring to EVAP CANISTER VENT VALVE INSPECTION .

Is it good condition? 		 Go To Step 4. Faulty EVAP canister vent valve.
4 Check EVAP canister vent control circuit 
  1. With ignition switch turned OFF, measure resistance between "G04-6" (or "G04-7") terminal and "G04-5" terminal of ECM connector.

Is resistance above 30 Ω at 20°C, 68°F? 		 Faulty ECM, substitute a known-good ECM and recheck. Shorted circuit between "BLK/RED" and "BLU/ WHT" wire and faulty ECM.
scientia non olet · About LEMON Manuals