F-CAN Circuit Troubleshooting (V6) - Honda Accord CR/CT 2012-2017

1.

F-CAN circuit resistance check:

F-CAN circuit resistance check

?1.	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 A (51P)

?4.

Measure the resistance between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
Test circuit	F CAN-H, F CAN-L
Test point 1	PCM connector A (51P) No. 9 (WHT)
Test point 2	PCM connector A (51P) No. 10 (RED)

Is there about 55?65 ??


	YES

Go to step 12


	NO

Go to step 2.

2.

Shorted wire check (F CAN-H line to F CAN-L line):

Shorted wire check (F CAN-H line to F CAN-L line)

?1.

Disconnect the following connectors.

	Gauge control module connector A (32P)
	VSA modulator-control unit 21P connector
	Steering angle sensor 4P connector
	EPS control unit connector A (11P)
	Engine mount control unit 16P connector
	Keyless access control unit connector C (24P)
	SRS unit connector A (39P)
	Audio-navigation unit connector D (18P) (with navigation)
	ANC/active sound control unit 20P connector
	ACC unit 20P connector (if equipped)
	LaneWatch camera 10P connector (if equipped)

?2.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector A (11P): disconnected
	Engine mount control unit 16P connector: disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Audio-navigation unit connector D (18P) (with navigation): disconnected
	ANC/active sound control unit 20P connector: disconnected
	ACC unit 20P connector (if equipped): disconnected
	LaneWatch camera 10P connector (if equipped): disconnected
Test circuit	F CAN-H, F CAN-L
Test point 1	PCM connector A (51P) No. 9 (WHT)
Test point 2	PCM connector A (51P) No. 10 (RED)

Is there continuity?


	YES

Repair a short in the F CAN-H wire to F CAN-L wire between PCM terminals A9 and A10.?


	NO

The F CAN-H and F CAN-L wires are not shorted. Go to step 3.

3.

Open wire check (F CAN-H line) 1:

Open wire check (F CAN-H line) 1

?1.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector A (11P): disconnected
	Engine mount control unit 16P connector: disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Audio-navigation unit connector D (18P) (with navigation): disconnected
	ANC/active sound control unit 20P connector: disconnected
	ACC unit 20P connector (if equipped): disconnected
	LaneWatch camera10P connector (if equipped): disconnected
Test circuit	F CAN-H
Test point 1	Gauge control module connector A (32P) No. 19 (WHT)
Test point 2	PCM connector A (51P) No. 9 (WHT)

Is there continuity?


	YES

The F CAN-H wire is not open. Go to step 4.


	NO

Repair an open in the F CAN-H wire between the PCM (A9) and the gauge control module.?

4.

Open wire check (F CAN-H line) 2:

Open wire check (F CAN-H line) 2

?1.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector A (11P): disconnected
	Engine mount control unit 16P connector: disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Audio-navigation unit connector D (18P) (with navigation): disconnected
	ANC/active sound control unit 20P connector: disconnected
	ACC unit 20P connector (if equipped): disconnected
	LaneWatch camera 10P connector (if equipped): disconnected
Test circuit	F CAN-H
Test point 1	VSA modulator-control unit 21P connector No. 8 (WHT)
Test point 2	PCM connector A (51P) No. 9 (WHT)

Is there continuity?


	YES

The F CAN-H wire is not open. Go to step 5.


	NO

Repair an open in the F CAN-H wire between the PCM (A9) and the VSA modulator-control unit.?

5.

Open wire check (F CAN-H line) 3:

Open wire check (F CAN-H line) 3

?1.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector A (11P): disconnected
	Engine mount control unit 16P connector: disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Audio-navigation unit connector D (18P) (with navigation): disconnected
	ANC/active sound control unit 20P connector: disconnected
	ACC unit 20P connector (if equipped): disconnected
	LaneWatch camera 10P connector (if equipped): disconnected
Test circuit	F CAN-H
Test point 1	EPS control unit connector A (11P) No. 10 (WHT)
Test point 2	PCM connector A (51P) No. 9 (WHT)

Is there continuity?


	YES

The F CAN-H wire is not open. Go to step 6.


	NO

Repair an open in the F CAN-H wire between the PCM (A9) and the EPS control unit.?

6.

Open wire check (F CAN-H line) 4:

Open wire check (F CAN-H line) 4

?1.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector A (11P): disconnected
	Engine mount control unit 16P connector: disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Audio-navigation unit connector D (18P) (with navigation): disconnected
	ANC/active sound control unit 20P connector: disconnected
	ACC unit 20P connector (if equipped): disconnected
	LaneWatch camera 10P connector (if equipped): disconnected
Test circuit	F CAN-H
Test point 1	Engine mount control unit 16P connector No. 13 (WHT)
Test point 2	PCM connector A (51P) No. 9 (WHT)

Is there continuity?


	YES

The F CAN-H wire is not open. Go to step 7.


	NO

Repair an open in the F CAN-H wire between the PCM (A9) and the engine mount control unit.?

7.

Open wire check (F CAN-L line) 1:

Open wire check (F CAN-L line) 1

?1.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector A (11P): disconnected
	Engine mount control unit 16P connector: disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Audio-navigation unit connector D (18P) (with navigation): disconnected
	ANC/active sound control unit 20P connector: disconnected
	ACC unit 20P connector (if equipped): disconnected
	LaneWatch camera 10P connector (if equipped): disconnected
Test circuit	F CAN-L
Test point 1	Gauge control module connector A (32P) No. 20 (RED)
Test point 2	PCM connector A (51P) No. 10 (RED)

Is there continuity?


	YES

The F CAN-L wire is not open. Go to step 8.


	NO

Repair an open in the F CAN-L wire between the PCM (A10) and the gauge control module.?

8.

Open wire check (F CAN-L line) 2:

Open wire check (F CAN-L line) 2

?1.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector A (11P): disconnected
	Engine mount control unit 16P connector: disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Audio-navigation unit connector D (18P) (with navigation): disconnected
	ANC/active sound control unit 20P connector: disconnected
	ACC unit 20P connector (if equipped): disconnected
	LaneWatch camera 10P connector (if equipped): disconnected
Test circuit	F CAN-L
Test point 1	VSA modulator-control unit 21P connector No. 15 (RED)
Test point 2	PCM connector A (51P) No. 10 (RED)

Is there continuity?


	YES

The F CAN-L wire is not open. Go to step 9.


	NO

Repair an open in the F CAN-L wire between the PCM (A10) and the VSA modulator-control unit.?

9.

Open wire check (F CAN-L line) 3:

Open wire check (F CAN-L line) 3

?1.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector A (11P): disconnected
	Engine mount control unit 16P connector: disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Audio-navigation unit connector D (18P) (with navigation): disconnected
	ANC/active sound control unit 20P connector: disconnected
	ACC unit 20P connector (if equipped): disconnected
	LaneWatch camera 10P connector (if equipped): disconnected
Test circuit	F CAN-L
Test point 1	EPS control unit connector A (11P) No. 11 (RED)
Test point 2	PCM connector A (51P) No. 10 (RED)

Is there continuity?


	YES

The F CAN-L wire is not open. Go to step 10.


	NO

Repair an open in the F CAN-L wire between the PCM (A10) and the EPS control unit.?

10.

Open wire check (F CAN-L line) 4:

Open wire check (F CAN-L line) 4

?1.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector A (11P): disconnected
	Engine mount control unit 16P connector: disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Audio-navigation unit connector D (18P) (with navigation): disconnected
	ANC/active sound control unit 20P connector: disconnected
	ACC unit 20P connector (if equipped): disconnected
	LaneWatch camera 10P connector (if equipped): disconnected
Test circuit	F CAN-L
Test point 1	Engine mount control unit 16P connector No. 15 (RED)
Test point 2	PCM connector A (51P) No. 10 (RED)

Is there continuity?


	YES

The F CAN-L wire is not open. Go to step 11.


	NO

Repair an open in the F CAN-L wire between the PCM (A10) and the engine mount control unit.?

11.

VSA modulator-control unit internal resistance check:

VSA modulator-control unit internal resistance check

?1.	Reconnect VSA modulator-control unit 21P connector.

?2.

Measure the resistance between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector A (11P): disconnected
	Engine mount control unit 16P connector: disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Audio-navigation unit connector D (18P) (with navigation): disconnected
	ANC/active sound control unit 20P connector: disconnected
	ACC unit 20P connector (if equipped): disconnected
	LaneWatch camera 10P connector (if equipped): disconnected
Test circuit	F CAN-H, F CAN-L
Test point 1	PCM connector A (51P) No. 9 (WHT)
Test point 2	PCM connector A (51P) No. 10 (RED)

Is there about 108?132 ??


	YES

The VSA modulator-control unit is OK. Go to step 12.


	NO

Replace the VSA modulator-control unit.?

12.

Shorted wire check (F CAN-H line):

Shorted wire check (F CAN-H line)

?1.

Disconnect the following connectors.

	Gauge control module connector A (32P)
	VSA modulator-control unit 21P connector
	Steering angle sensor 4P connector
	EPS control unit connector A (11P)
	Engine mount control unit 16P connector
	Keyless access control unit connector C (24P)
	SRS unit connector A (39P)
	Audio-navigation unit connector D (18P) (with navigation)
	ANC/active sound control unit 20P connector
	ACC unit 20P connector (if equipped)
	LaneWatch camera 10P connector (if equipped)

?2.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector A (11P): disconnected
	Engine mount control unit 16P connector: disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Audio-navigation unit connector D (18P) (with navigation): disconnected
	ANC/active sound control unit 20P connector: disconnected
	ACC unit 20P connector (if equipped): disconnected
	LaneWatch camera 10P connector (if equipped): disconnected
Test circuit	F CAN-H
Test point 1	PCM connector A (51P) No. 9 (WHT)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the F CAN-H wire between the PCM (A9) and the gauge control module, the VSA modulator-control unit, the steering angle sensor, the EPS control unit, the engine mount control unit, the keyless access control unit, the SRS unit, the ANC/active sound control unit, the audio-navigation unit, the ACC unit (if equipped), the FCW/LCW camera unit (if equipped), or the DLC.?


	NO

The F CAN-H wire is OK. Go to step 13.

13.

Shorted wire check (F CAN-L line):

Shorted wire check (F CAN-L line)

?1.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector A (11P): disconnected
	Engine mount control unit 16P connector: disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Audio-navigation unit connector D (18P) (with navigation): disconnected
	ANC/active sound control unit 20P connector: disconnected
	ACC unit 20P connector (if equipped): disconnected
	LaneWatch camera 10P connector (if equipped): disconnected
Test circuit	F CAN-L
Test point 1	PCM connector A (51P) No. 10 (RED)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the F CAN-L wire between the PCM (A10) and the gauge control module, the VSA modulator-control unit, the steering angle sensor, the EPS control unit, the engine mount control unit, the keyless access control unit, the SRS unit, the ANC/active sound control unit, the audio-navigation unit (or audio unit), the ACC unit (if equipped), the LaneWatch camera (if equipped), or the DLC.?


	NO

The F CAN-L wire is OK. Go to step 14.

14.

Gauge control module check:

Gauge control module check

?1.	Reconnect all connectors.

?2.	Connect the HDS to the DLC.

?3.

Disconnect the following connector.

Gauge control module connector A (32P)

?4.	Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the gauge control module.?


	NO

Go to step 15.

15.

VSA modulator-control unit check:

VSA modulator-control unit check

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Reconnect the gauge control module connector A (32P).

?3.

Disconnect the following connector.

VSA modulator-control unit 21P connector

?4.	Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the VSA modulator-control unit.?


	NO

Go to step 16.

16.

Steering angle sensor check:

Steering angle sensor check

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Reconnect the VSA modulator-control unit 21P connector.

?3.

Disconnect the following connector.

Steering angle sensor 4P connector

?4.	Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the steering angle sensor.?


	NO (with navigation)

Go to step 17.


	NO (without navigation)

Go to step 18.

17.

Navigation unit check:

Navigation unit check

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Reconnect the steering angle sensor 4P connector.

?3.

Disconnect the following connector.

Audio-navigation unit connector D (18P)

?4.	Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the audio-navigation unit.?


	NO

Go to step 18.

18.

EPS control unit check:

EPS control unit check

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Reconnect the steering angle sensor 4P connector (without navigation) or the audio-navigation unit connector D (18P) (with navigation).

?3.

Disconnect the following connector.

EPS control unit connector A (11P)

?4.	Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the EPS control unit.?


	NO

Go to step 19.

19.

Engine mount control unit check:

Engine mount control unit check

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Reconnect EPS control unit connector A (11P).

?3.

Disconnect the following connector.

Engine mount control unit 16P connector

?4.	Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the engine mount control unit.?


	NO

Go to step 20.

20.

ANC/active sound control unit check:

ANC/active sound control unit check

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Reconnect the engine mount control unit 16P connector.

?3.

Disconnect the following connector.

ANC/active sound control unit 20P connector

?4.	Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the ANC/active sound control unit.?


	NO

Go to step 21.

21.

Keyless access control unit check:

Keyless access control unit check

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Reconnect the ANC/active sound control unit 20P connector.

?3.

Disconnect the following connector.

Keyless access control unit connector C (24P)

?4.	Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the keyless access control unit.?


	NO

Go to step 22.

22.

SRS unit check:

SRS unit check

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Reconnect keyless access control unit connector C (24P).

?3.

Disconnect the following connector.

SRS unit connector A (39P)

?4.	Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the SRS unit.?


	NO (without ACC or FCW/LCW camera unit)

Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the HDS identifies the vehicle and the PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the PCM was substituted, replace the original PCM.?


	NO (with ACC or FCW/LCW camera unit)

Go to step 23.

23.

ACC unit check:

ACC unit check

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Reconnect SRS unit connector A (39P).

?3.

Disconnect the following connector.

ACC unit 20P connector

?4.	Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the ACC unit.?


	NO (without FCW/LCW camera unit)

Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the HDS identifies the vehicle and the PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the PCM was substituted, replace the original PCM.?


	NO (with FCW/LCW camera unit)

Go to step 24.

24.

FCW/LCW camera unit check:

FCW/LCW camera unit check

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Reconnect the ACC unit 20P connector .

?3.

Disconnect the following connector.

LaneWatch camera 10P connector

?4.	Press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the LaneWatch camera.?


	NO

Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the HDS identifies the vehicle and the PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the PCM was substituted, replace the original PCM.?