DTC Troubleshooting: P0443
DTC P0443: EVAP Canister Purge Valve Circuit Malfunction
Special Tools Required
Vacuum Pump/Gauge, 0?30 inHg Snap-on YA4000A or equivalent, commercially available
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0443 EVAP Canister Purge Valve Circuit Malfunction
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Turn the vehicle to the OFF (LOCK) mode.

?4.
Start the engine.

?5.
Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

?6.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0443 EVAP Canister Purge Valve Circuit Malfunction
    

Is DTC P0443 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EVAP canister purge valve and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
2.
Determine possible failure area (EVAP canister purge valve stuck open failure, EVAP canister purge valve stuck closed failure):

Determine possible failure area (EVAP canister purge valve stuck open failure, EVAP canister purge valve stuck closed failure)
?1.
Turn the vehicle to the OFF (LOCK) mode, and allow the engine to cool below 131 °F (55 °C).

?2.
Remove the EVAP canister purge valve with its connector and vacuum hose connected.

?3.
Disconnect the vacuum hose (purge line) (A) from the EVAP canister purge valve (B) in the engine compartment, then connect a vacuum pump/gauge, 0?30 inHg (C) to the EVAP canister purge valve as shown.


?4.
Start the engine, and let it idle.

Is there vacuum?

     
YES
     
     
     
The EVAP canister purge valve is stuck open. Go to step 3.
     
NO
     
     
     
The EVAP canister purge valve is stuck closed. Go to step 5.
3.
Determine possible failure area (IPV line, EVAP canister purge valve):

Determine possible failure area (IPV line, EVAP canister purge valve)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
EVAP canister purge valve 2P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
EVAP canister purge valve 2P connector: disconnected
Test point 1
EVAP canister purge valve 2P connector (female terminals) No. 1:
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
4.
Shorted wire check (IPV line):

Shorted wire check (IPV line)
?1.
Jump the SCS line with the HDS, and wait more than 1 minute.


?2.
Disconnect the following connector.
PCM connector E (80P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
EVAP canister purge valve 2P connector: disconnected
 
PCM connector E (80P): disconnected
Test point 1
EVAP canister purge valve 2P connector (female terminals) No. 1:
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short in the IPV wire between the PCM (E80) and the EVAP canister purge valve.?
     
NO
     
     
     
The IPV wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM.?
5.
Open wire check (IGPS(IPV)/IGPS(LAF) line):

Open wire check (IGPS(IPV)/IGPS(LAF) line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
EVAP canister purge valve 2P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
EVAP canister purge valve 2P connector: disconnected
Test point 1
EVAP canister purge valve 2P connector (female terminals) No. 2:
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
Go to step 6.
     
NO
     
     
     
Repair an open in the IGPS(IPV)/IGPS(LAF) wire between the EVAP canister purge valve and the No. A11 (7.5 A) fuse in the under-hood fuse/relay box.?
6.
Open wire check (IPV line):

Open wire check (IPV line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS, and wait more than 1 minute.


?3.
Disconnect the following connector.
PCM connector E (80P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
EVAP canister purge valve 2P connector: disconnected
 
PCM connector E (80P): disconnected
Test point 1
EVAP canister purge valve 2P connector (female terminals) No. 1:
Test point 2
PCM connector E (80P) No. 80


Is there continuity?

     
YES
     
     
     
Go to step 7.
     
NO
     
     
     
Repair an open in the IPV wire between the PCM (E80) and the EVAP canister purge valve.?
7.
EVAP canister purge valve internal resistance check:

EVAP canister purge valve internal resistance check
?1.
At the purge valve side, measure the resistance between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
EVAP canister purge valve 2P connector: disconnected
 
PCM connector E (80P): disconnected
Test point 1
EVAP canister purge valve 2P connector (male terminals) No. 1 (EVAP canister purge valve side):
Test point 2
EVAP canister purge valve 2P connector (male terminals) No. 2 (EVAP canister purge valve side):


Is there about 23?26 ? at room temperature?

     
YES
     
     
     
The EVAP canister purge valve is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM.?
     
NO