DTC Troubleshooting: P0201, P0204 (L15BA) - 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.	Start the engine (If the engine does not start, crank the engine for 20 seconds).

?4.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC
P0201 No. 1 Cylinder Injector Circuit Malfunction
P0204 No. 4 Cylinder Injector Circuit Malfunction

Is DTC P0201 and/or P0204 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 injector 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.

Engine starting check:

Engine starting check

?1.	Try to start the engine.

Does the engine start?


	YES

Go to step 9.


	NO

Go to step 3.

3.

Relay check:

Relay check

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

?2.	Remove the injector relay.

?3.	Test the injector relay.

Is the relay OK?


	YES

The relay is OK. Go to step 4.


	NO

Replace the injector relay.?

4.

Open wire check (+B INJ line):

Open wire check (+B INJ line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
Test condition	Injector relay: disconnected
Test point 1	Injector relay 4P socket (female terminals) No. 3 and No. 7:
Test point 2	Body ground

Is there battery voltage?


	YES

The +B INJ wire is OK. Go to step 6.


	NO

Go to step 5.

5.

Fuse check:

Fuse check

?1.

Check the following fuse.

Fuse	No. A10 (15 A)
Location	Under-hood fuse/relay box

Is the fuse OK?


	YES

Repair an open in the +B INJ wire between the No. A10 (15 A) fuse and the injector relay.?


	NO

Repair a short in the +B INJ wire between the injector relay and the No. A10 (15 A) fuse. Also replace the No. A10 (15 A) fuse.?

6.

Determine possible failure area (FI MAIN RLY CL- line, others):

Determine possible failure area (FI MAIN RLY CL- line, others)

?1.	Turn the vehicle to ON mode.

?2.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test condition	Injector relay: disconnected
Test point 1	Injector relay 4P socket (female terminals) No. 7:
Test point 2	Injector relay 4P socket (female terminals) No. 8:

Is there battery voltage?


	YES

Go to step 8.


	NO

Go to step 7.

7.

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

Open wire check (FI MAIN RLY CL- 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 A (50P)

?4.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Injector relay: disconnected
	PCM connector A (50P): disconnected
Test point 1	Injector relay 4P socket (female terminals) No. 8:
Test point 2	PCM connector A (50P) No. 5

Is there continuity?


	YES

The FI MAIN RLY CL- 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 P0201 and/or P0204 goes away and the PCM was substituted, replace the original PCM.?


	NO

Repair an open in the FI MAIN RLY CL- wire between the PCM (A5) and the injector relay.?

8.

Open wire check (INJ RLY OUT line):

Open wire check (INJ RLY OUT line)

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

?2.

Connect terminals A and B with a jumper wire.

Terminal A	Injector relay 4P socket (female terminals) No. 3:
Terminal B	Injector relay 4P socket (female terminals) No. 4:

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

?4.

Disconnect the following connector.

PCM connector A (50P)

?5.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Injector relay: disconnected
	Injector relay 4P socket No. 3 and No. 4: jumped
	PCM connector A (50P): disconnected
Test point 1	PCM connector A (50P) No. 1 and No. 2
Test point 2	Body ground

Is there battery voltage?


	YES

The INJ RLY OUT wire is OK. Go to step 9.


	NO

Repair an open in the INJ RLY OUT wire between the PCM (A1, A2) and the injector relay.?

9.

DTC check:

DTC check

?1.	Check the indicated DTC in step 1.

Is DTC P0201 indicated?


	YES

Go to step 10.


	NO

Go to step 18.

10.

Open wire check (INJH1 line, INJL1 line):

Open wire check (INJH1 line, INJL1 line)

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

?2.	Reinstall the injector relay.

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

?4.

Disconnect the following connector.

PCM connector E (80P)

?5.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
Test point 1	PCM connector E (80P) No. 3
Test point 2	PCM connector E (80P) No. 15

Is there continuity?


	YES

The INJH1 and INJL1 wires are not open. Go to step 13.


	NO

Go to step 11.

11.

Open wire check (INJH1 line):

Open wire check (INJH1 line)

?1.

Disconnect the following connector.

No. 1 injector 2P connector

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 1 injector 2P connector: disconnected
Test point 1	No. 1 injector 2P connector (female terminals) No. 1:
Test point 2	PCM connector E (80P) No. 15

Is there continuity?


	YES

The INJH1 wire is OK. Go to step 12.


	NO

Repair an open in the INJH1 wire between the PCM (E15) and the No. 1 injector.?

12.

Open wire check (INJL1 line):

Open wire check (INJL1 line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 1 injector 2P connector: disconnected
Test point 1	No. 1 injector 2P connector (female terminals) No. 2:
Test point 2	PCM connector E (80P) No. 3

Is there continuity?


	YES

The INJL1 wire is OK. Replace the No. 1 injector.?


	NO

Repair an open in the INJL1 wire between the PCM (E3) and the No. 1 injector.?

13.

Shorted wire check (INJH1 line to power):

Shorted wire check (INJH1 line to power)

?1.

Disconnect the following connector.

No. 1 injector 2P connector

?2.	Turn the vehicle to the ON mode.

?3.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 1 injector 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 15
Test point 2	Body ground

Is there any voltage?


	YES

Repair a short to power in the INJH1 wire between the PCM (E15) and the No. 1 injector.?


	NO

Go to step 14.

14.

Shorted wire check (INJL1 line to power):

Shorted wire check (INJL1 line to power)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 1 injector 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 3
Test point 2	Body ground

Is there any voltage?


	YES

Repair a short to power in the INJL1 wire between the PCM (E3) and the No. 1 injector.?


	NO

Go to step 15.

15.

Shorted wire check (INJH1 line to ground):

Shorted wire check (INJH1 line to ground)

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

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 1 injector 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 15
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the INJH1 wire between the PCM (E15) and the No. 1 injector.?


	NO

The INJH1 wire is OK. Go to step 16.

16.

Shorted wire check (INJL1 line to ground):

Shorted wire check (INJL1 line to ground)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 1 injector 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 3
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the INJL1 wire between the PCM (E3) and the No. 1 injector.?


	NO

The INJL1 wire is OK. Go to step 17.

17.

Shorted wire check (INJH4 line):

Shorted wire check (INJH4 line)

?1.

Disconnect the following connector.

No. 4 injector 2P connector

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 1 injector 2P connector: disconnected
	No. 4 injector 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 2
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the INJH4 wire between the PCM (E2) and the No. 4 injector.?


	NO

The INJH4 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 P0201 and/or P0204 goes away and the PCM was substituted, replace the original PCM.?

18.

Open wire check (INJH4 line, INJL4 line):

Open wire check (INJH4 line, INJL4 line)

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

?2.	Reinstall the injector relay.

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

?4.

Disconnect the following connector.

PCM connector E (80P)

?5.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
Test point 1	PCM connector E (80P) No. 2
Test point 2	PCM connector E (80P) No. 16

Is there continuity?


	YES

The INJH4 and INJL4 wires are not open. Go to step 21.


	NO

Go to step 19.

19.

Open wire check (INJH4 line):

Open wire check (INJH4 line)

?1.

Disconnect the following connector.

No. 4 injector 2P connector

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 4 injector 2P connector: disconnected
Test point 1	No. 4 injector 2P connector (female terminals) No. 1:
Test point 2	PCM connector E (80P) No. 2

Is there continuity?


	YES

The INJH4 wire is OK. Go to step 20.


	NO

Repair an open in the INJH4 wire between the PCM (E2) and the No. 4 injector.?

20.

Open wire check (INJL4 line):

Open wire check (INJL4 line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 4 injector 2P connector: disconnected
Test point 1	No. 4 injector 2P connector (female terminals) No. 2:
Test point 2	PCM connector E (80P) No. 16

Is there continuity?


	YES

The INJL4 wire is OK. Replace the No. 4 injector.?


	NO

Repair an open in the INJL4 wire between the PCM (E16) and the No. 4 injector.?

21.

Shorted wire check (INJH4 line to power):

Shorted wire check (INJH4 line to power)

?1.

Disconnect the following connector.

No. 4 injector 2P connector

?2.	Turn the vehicle to the ON mode.

?3.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 4 injector 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 2
Test point 2	Body ground

Is there any voltage?


	YES

Repair a short to power in the INJH4 wire between the PCM (E2) and the No. 4 injector.?


	NO

Go to step 22.

22.

Shorted wire check (INJL4 line to power):

Shorted wire check (INJL4 line to power)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 4 injector 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 16
Test point 2	Body ground

Is there any voltage?


	YES

Repair a short to power in the INJL4 wire between the PCM (E16) and the No. 4 injector.?


	NO

Go to step 23.

23.

Shorted wire check (INJH4 line to ground):

Shorted wire check (INJH4 line to ground)

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

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 4 injector 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 2
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the INJH4 wire between the PCM (E2) and the No. 4 injector.?


	NO

The INJH4 wire is OK. Go to step 24.

24.

Shorted wire check (INJL4 line to ground):

Shorted wire check (INJL4 line to ground)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 4 injector 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 16
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the INJL4 wire between the PCM (E16) and the No. 4 injector.?


	NO

The INJL4 wire is OK. Go to step 25.

25.

Shorted wire check (INJH1 line):

Shorted wire check (INJH1 line)

?1.

Disconnect the following connector.

No. 1 injector 2P connector

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	PCM connector E (80P): disconnected
	No. 4 injector 2P connector: disconnected
	No. 1 injector 2P connector: disconnected
Test point 1	PCM connector E (80P) No. 15
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the INJH1 wire between the PCM (E15) and the No. 1 injector.?


	NO

The INJH1 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 P0201 and/or P0204 goes away and the PCM was substituted, replace the original PCM.?