DTC Troubleshooting: P0560 (K20C1) - Honda Civic FC/FK 2016-2021

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.	Turn the vehicle to the ON mode.

?5.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC
P0560 PCM Power Source Circuit Unexpected Voltage

Is DTC P0560 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 relay circuit board (PGM-FI main relay 1 circuit) 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.

Relay circuit board check:

Relay circuit board check

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

?2.	Remove and test the relay circuit board.

Is the relay circuit board OK?


	YES

Go to step 3.


	NO

Replace the relay circuit board.?

3.

Fuse check:

Fuse check

?1.

Check the following fuse.

Fuse	No. A7 (20 A)
Location	Under-hood fuse/relay box

Is the fuse OK?


	YES

Go to step 6.


	NO

Go to step 4.

4.

Shorted wire check (+B IGP line):

Shorted wire check (+B IGP line)

?1.	Remove the blown No. A7 (20 A) fuse from the under-hood fuse/relay box.

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Relay circuit board: removed
Test point 1	Relay circuit board connector C (18P) (female terminals) No. 18:
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the +B IGP wire between the relay circuit board and the No. A7 (20 A) fuse in the under-hood fuse/relay box.?


	NO

Go to step 5.

5.

Shorted wire check (FI MAIN RLY OUT line):

Shorted wire check (FI MAIN RLY OUT line)

?1.	Remove PGM-FI main relay 2.

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

?3.

Disconnect the following connector.

PCM connector No. 2 (58P)

?4.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Relay circuit board: removed
	PGM-FI main relay 2: disconnected
	PCM connector No. 2 (58P): disconnected
Test point 1	Relay circuit board connector C (18P) (female terminals) No. 17:
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the FI MAIN RLY OUT wire between PCM connector No. 2 terminals (No. 2, No. 4, No. 6), the relay circuit board, and PGM-FI main relay 2.?


	NO

The FI MAIN RLY OUT wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0560 goes away and the PCM was substituted, replace the original PCM.?

6.

Open wire check (+B IGP line):

Open wire check (+B IGP line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Relay circuit board: removed
Test point 1	Relay circuit board connector C (18P) (female terminals) No. 18:
Test point 2	Body ground

Is there battery voltage?


	YES

Go to step 7.


	NO

Repair an open in the +B IGP wire between the relay circuit board and the No. A7 (20 A) fuse in the under-hood fuse/relay box.?

7.

Open wire check (FI MAIN RLY CL- line):

Open wire check (FI MAIN RLY CL- line)

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

?2.

Disconnect the following connector.

PCM connector No. 2 (58P)

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Relay circuit board: removed
	PCM connector No. 2 (58P): disconnected
Test point 1	Relay circuit board connector C (18P) (female terminals) No. 5:
Test point 2	PCM connector No. 2 (58P) No. 26

Is there continuity?


	YES

Go to step 8.


	NO

Repair an open in the FI MAIN RLY CL- wire between PCM connector No. 2 terminal No. 26 and the relay circuit board.?

8.

Open wire check (FI MAIN RLY OUT line):

Open wire check (FI MAIN RLY OUT line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Relay circuit board: removed
	PCM connector No. 2 (58P): disconnected
Test point 1	Relay circuit board connector C (18P) (female terminals) No. 17:
Test point 2	PCM connector No. 2 (58P) No. 2, No. 4, and No. 6

Is there continuity?


	YES

The FI MAIN RLY OUT wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0560 goes away and the PCM was substituted, replace the original PCM.?


	NO

Repair an open in the FI MAIN RLY OUT wire between PCM connector No. 2 terminals (No. 2, No. 4, No. 6) and the relay circuit board.?