DTC Troubleshooting: P0443 (L4) - Honda Accord CR/CT 2012-2017

1.

Problem verification:

Problem verification

?1.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?2.	Clear the DTC with the HDS.

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

?4.

Check for Pending or Confirmed DTCs with the HDS.

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

Is DTC P0443 indicated?


	YES

The failure is duplicated. 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.?

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 ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, and allow the engine to cool below 140 °F (60 °C).

?2.	Disconnect the vacuum hose (A) from the EVAP canister (B) in the engine compartment, then connect a vacuum pump/gauge to the hose.

?3.	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 (PCS line, EVAP canister purge valve):

Determine possible failure area (PCS line, EVAP canister purge valve)

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

EVAP canister purge valve 2P connector

?3.

Check for continuity between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
	EVAP canister purge valve 2P connector: disconnected
Test circuit	PCS
Test point 1	EVAP canister purge valve 2P connector No. 1 (YEL/BLU)
Test point 2	Body ground

Is there continuity?


	YES

Go to step 4.


	NO

Replace the EVAP canister purge valve, then do the repair verification.

4.

Shorted wire check (PCS line):

Shorted wire check (PCS line)

?1.	Jump the SCS line with the HDS.

?2.

Disconnect the following connector.

PCM connector B (51P)

?3.

Check for continuity between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
	EVAP canister purge valve 2P connector: disconnected
	PCM connector B (51P): disconnected
Test circuit	PCS
Test point 1	EVAP canister purge valve 2P connector No. 1 (YEL/BLU)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the PCS wire between the PCM (B15) and the EVAP canister purge valve, then do the repair verification.


	NO

The PCS wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.

5.

Open wire check (IG1 (PCS)/IG1 ACG line):

Open wire check (IG1 (PCS)/IG1 ACG line)

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

EVAP canister purge valve 2P connector

?3.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	IG ON (II) or ON mode
	EVAP canister purge valve 2P connector: disconnected
Test circuit	IG1 (PCS)
Test point 1	EVAP canister purge valve 2P connector No. 2 (BLK/YEL)
Test point 2	Body ground

Is there battery voltage?


	YES

The IG1 (PCS)/IG1 ACG wire is OK. Go to step 6.


	NO

Repair an open in the IG1 (PCS)/IG1 ACG wire between the EVAP canister purge valve and the No. B13 (15 A) fuse in the under-dash fuse/relay box, then do the repair verification.

6.

Open wire check (PCS line):

Open wire check (PCS line)

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.	Jump the SCS line with the HDS.

?3.

Disconnect the following connector.

PCM connector B (51P)

?4.

Check for continuity between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
	EVAP canister purge valve 2P connector: disconnected
	PCM connector B (51P): disconnected
Test circuit	PCS
Test point 1	EVAP canister purge valve 2P connector No. 1 (YEL/BLU)
Test point 2	PCM connector B (51P) No. 15 (YEL/BLU)

Is there continuity?


	YES

The PCS wire is OK. Go to step 7.


	NO

Repair an open in the PCS wire between the PCM (B15) and the EVAP canister purge valve, then do the repair verification.

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	IG LOCK (0) or OFF mode
	EVAP canister purge valve 2P connector: disconnected
	PCM connector B (51P): disconnected
Test circuit	IG1 (PCS), PCS
Test point 1	EVAP canister purge valve 2P connector No. 1 (EVAP canister purge valve side)
Test point 2	EVAP canister purge valve 2P connector No. 2 (EVAP canister purge valve side)

Is there about 23?26 ? at room temperature?


	YES

The EVAP canister purge valve is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.


	NO

Replace the EVAP canister purge valve, then do the repair verification.

Repair verification (OBD STATUS check):

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.	Reconnect all connectors.

?3.	Exit the SCS mode with the HDS.

?4.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?5.	Reset the PCM with the HDS.

?6.	Do the PCM idle learn procedure.

?7.

Monitor the OBD STATUS for DTC P0443 in the DTCs MENU with the HDS.

DTC Description	OBD STATUS
P0443 EVAP Canister Purge Valve Circuit Malfunction

Does the HDS indicate PASSED, FAILED, EXECUTING, or OUT OF CONDITION?


	PASSED

Troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.?


	FAILED

Go to step 1 and recheck. If the PCM was updated, substitute a known-good PCM, then check the OBD STATUS again.


	EXECUTING

Keep idling until a result comes on.


	OUT OF CONDITION

Keep idling until a result comes on