LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2011 >> Grand Vitara Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis >> Diagnostic Information and Procedures >> DTC P0443: Evaporative Emission System Purge Control Valve Circuit >> DTC Troubleshooting
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Troubleshooting

P0443 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:J24B .
2  EVAP canister purge valve power supply circuit check 
  1. Turn OFF ignition switch and disconnect connector from EVAP canister purge valve.
  2. Check for proper terminal connection to EVAP canister purge valve connector.
  3. If connections are OK, check that EVAP canister purge valve power supply circuit (A1) voltage is battery voltage between EVAP canister purge valve connector and vehicle body ground with ignition switch in ON position.

Is it in good condition? 		 Go to Step 3. Repair or replace defective wire harness.
3  EVAP canister purge valve drive circuit check 
  1. Turn OFF ignition switch and disconnect connectors from ECM.
  2. Check that EVAP canister purge valve drive circuit (B1) is as follows.
    • Wiring harness resistance of EVAP canister purge valve drive circuit is less than 3 Ω.
    • Insulation resistance of EVAP canister purge valve drive circuit is infinity between EVAP canister purge valve connector and vehicle body ground.
    • Insulation resistance of wire harness is infinity between EVAP canister purge valve drive circuit terminal and each terminal at EVAP canister purge valve connector.
    • Circuit voltage of EVAP canister purge valve drive circuit is 0 - 1 V with ignition switch in ON position.

Is it in good condition? 		 Go to Step 4. Repair or replace defective wire harness.
4  EVAP canister purge valve check 
  1. Check EVAP canister purge valve for resistance, see EVAP CANISTER PURGE VALVE INSPECTION .

Is it in good condition? 		 Substitute a known-good ECM and recheck. Replace EVAP canister purge valve.
scientia non olet · About LEMON Manuals