DTC Troubleshooting: P1549 (L4) - Honda Accord CR/CT 2012-2017

DTC Troubleshooting: P1549

DTC P1549: Charging System High Voltage

NOTE:

	Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
	If a high voltage battery (24 V, etc.) is connected to the vehicle, this DTC can be stored.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P1549 Charging System High Voltage

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.

?4.

Check under these conditions:

	A/C off
	Headlights off
	Rear window defogger off

?5.	Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) for 1 minute.

?6.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P1549 Charging System High Voltage

Is DTC P1549 indicated?


	YES

The failure is duplicated. Replace the alternator, then do the repair verification.


	NO

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box.?

Repair verification (OBD STATUS check):

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

?2.	Reset the PCM with the HDS.

?3.	Do the PCM idle learn procedure.

?4.	Start the engine.

?5.

Check under these conditions:

	A/C off
	Headlights off
	Rear window defogger off

?6.

Monitor the OBD STATUS for DTC P1549 in the DTCs MENU with the HDS.

DTC Description	OBD Status
P1549 Charging System High Voltage

Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?


	PASSED

Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.?


	FAILED

Go to step 1 and recheck.


	NOT COMPLETED

Meet the test condition, and check the OBD STATUS again.