DTC P0443 - Evaporative (EVAP) Control System Purge Flow Incorrect
- Start engine and allow it to reach normal operating temperature. Turn ignition off. Raise and support vehicle. Start engine. Place gear selector in "L" (A/T) or 2nd (M/T). Set transfer case in 2H. Release parking brake. Go to next step.
- Disconnect purge hose from EVAP canister. Place a finger against end of disconnected hose. Ensure vacuum is not felt with engine at idle. Increase engine speed to greater than 2000 RPM. Vacuum should now be present. If operation is as specified, go to next step. If operation is not as specified, go to step 4).
- Disconnect vacuum hoses from EVAP canister. Blow air into tank port of EVAP canister. Air should flow through both purge port at top of canister and air pipe at bottom of canister. When air is blown into purge port, air should not flow through any port. If operation is as specified, replace PCM. If operation is not as specified, replace EVAP canister. Retest system.
- Disconnect purge hose from intake manifold. With engine idling, vacuum should be felt at vacuum port. If vacuum is present, ensure purge hose is free of restriction and go to next step. If vacuum is not present, clean vacuum port with compressed air. Retest system.
- Turn engine off, leaving ignition on. With purge hose disconnected from intake manifold and EVAP canister purge valve, blow into port "A". See Fig 1
. Air should not flow through port "B". Turn ignition off. Using a fused jumper wire, connect PCM harness connector "B", terminal No. 10 to ground. Turn ignition on. Blow into port "A". Air should flow through port "B". If operation is as specified, replace PCM. If operation is not as specified, go to next step.
- Turn ignition off. Disconnect EVAP canister purge valve harness connector. Using an ohmmeter, measure resistance of purge valve. If resistance is 28-36 ohms at 68°F (20°C), go to next step. If resistance is not as specified, replace EVAP canister purge valve. Retest system.
- Blow into port "A" of purge valve. Air should not flow through port "B". Using fused jumper wires, connect 12-volt battery and ground to EVAP canister purge valve terminals. Blow into hose "A". Air should pass through port "B". If operation is as specified, check EVAP canister purge valve harness for an open or short. Repair as necessary. If operation is not as specified, replace EVAP canister purge valve. Retest system.
Courtesy of SUZUKI OF AMERICA CORP.