F-CAN Circuit Troubleshooting | 2012-2016 CR-V RM1/RM4,RE5/RE6 HONDA CR-V Service Manual

1.

F-CAN circuit resistance check:

F-CAN circuit resistance check

?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 (51P)

?4.

Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
Test point 1	PCM connector A (51P) No. 2
Test point 2	PCM connector A (51P) No. 1

Is there about 80?116 ??


	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 38P connector
	Steering angle sensor 4P connector
	Audio unit or audio-navigation unit connector G (24P)
	EPS control unit connector A (11P)
	Keyless access control unit connector C (24P) (with keyless access system)
	SRS unit connector A (39P)
	Real time AWD control unit 24P connector (with real time AWD system)
	Multipurpose camera unit 20P connector (With ACC)

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 38P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	Audio unit or audio-navigation unit connector G (24P): disconnected
	EPS control unit connector A (11P): disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 8P connector: disconnected
Test point 1	PCM connector A (51P) No. 1
Test point 2	PCM connector A (51P) No. 2

Is there continuity?


	YES

Repair a short in the F-CAN_H wire to F-CAN_L wire between PCM terminals A1 and A2.?


	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	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 38P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	Audio unit or audio-navigation unit connector G (24P): disconnected
	EPS control unit connector A (11P): disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 20P connector: disconnected
Test point 1	Gauge control module connector A (32P) No. 19
Test point 2	PCM connector A (51P) No. 2

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 (A2) 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	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 38P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	Audio unit or audio-navigation unit connector G (24P): disconnected
	EPS control unit connector A (11P): disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 20P connector: disconnected
Test point 1	VSA modulator-control unit 38P connector No. 38
Test point 2	PCM connector A (51P) No. 2

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 (A2) 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	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 38P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	Audio unit or audio-navigation unit connector G (24P): disconnected
	EPS control unit connector A (11P): disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 20P connector: disconnected
Test point 1	EPS control unit connector A (11P) No. 7
Test point 2	PCM connector A (51P) No. 2

Is there continuity?


	YES (With keyless access system)

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


	YES (Without keyless access system)

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 (A2) 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	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 38P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	Audio unit or audio-navigation unit connector G (24P): disconnected
	EPS control unit connector A (11P): disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 20P connector: disconnected
Test point 1	Keyless access control unit connector C (24P) No. 4
Test point 2	PCM connector A (51P) No. 2

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 (A2) and the keyless access 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	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 38P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	Audio unit or audio-navigation unit connector G (24P): disconnected
	EPS control unit connector A (11P): disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 20P connector: disconnected
Test point 1	Gauge control module connector A (32P) No. 20
Test point 2	PCM connector A (51P) No. 1

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 (A1) 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	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 38P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	Audio unit or audio-navigation unit connector G (24P): disconnected
	EPS control unit connector A (11P): disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 20P connector: disconnected
Test point 1	VSA modulator-control unit 38P connector No. 26
Test point 2	PCM connector A (51P) No. 1

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 (A1) 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	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 38P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	Audio unit or audio-navigation unit connector G (24P): disconnected
	EPS control unit connector A (11P): disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 20P connector: disconnected
Test point 1	EPS control unit connector A (11P) No. 9
Test point 2	PCM connector A (51P) No. 1

Is there continuity?


	YES (With keyless access system)

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


	YES (Without keyless access system)

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 (A1) 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	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 38P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	Audio unit or audio-navigation unit connector G (24P): disconnected
	EPS control unit connector A (11P): disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 20P connector: disconnected
Test point 1	Keyless access control unit connector C (24P) No. 5
Test point 2	PCM connector A (51P) No. 1

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 (A1) and the keyless access control unit.?

11.

Gauge control module internal resistance check:

Gauge control module internal resistance check

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

?2.

Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	VSA modulator-control unit 38P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	Audio unit or audio-navigation unit connector G (24P): disconnected
	EPS control unit connector A (11P): disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 20P connector: disconnected
Test point 1	PCM connector A (51P) No. 1
Test point 2	PCM connector A (51P) No. 2

Is there about 109?134 ??


	YES

The gauge control module is OK. Go to step 12.


	NO

Replace the gauge control module.?

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 38P connector
	Steering angle sensor 4P connector
	Audio unit or audio-navigation unit connector G (24P)
	EPS control unit connector A (11P)
	Keyless access control unit connector C (24P) (with keyless access system)
	SRS unit connector A (39P)
	Real time AWD control unit 24P connector (with real time AWD system)
	Multipurpose camera unit 20P connector (With ACC)

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 38P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	Audio unit or audio-navigation unit connector G (24P): disconnected
	EPS control unit connector A (11P): disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 20P connector: disconnected
Test point 1	PCM connector A (51P) No. 2
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the F-CAN_H wire between the PCM (A2) and the gauge control module, the VSA modulator-control unit, the steering angle sensor, the audio unit or audio-navigation unit, the EPS control unit, the keyless access control unit, the SRS unit, real time AWD control unit, the multipurpose camera unit, 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	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module connector A (32P): disconnected
	VSA modulator-control unit 38P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	Audio unit or audio-navigation unit connector G (24P): disconnected
	EPS control unit connector A (11P): disconnected
	Keyless access control unit connector C (24P): disconnected
	SRS unit connector A (39P): disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 20P connector: disconnected
Test point 1	PCM connector A (51P) No. 1
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the F-CAN_L wire between the PCM (A1) and the gauge control module, the VSA modulator-control unit, the steering angle sensor, the audio unit or audio-navigation unit, the EPS control unit, the keyless access control unit, the SRS unit, the real time AWD control unit, the multipurpose camera unit, 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.	Turn the vehicle to the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the gauge control module.?


	NO

Reconnect gauge control module connector A (32P) with vehicle in OFF (LOCK) mode, then go to step 15.

15.

VSA modulator-control unit check:

VSA modulator-control unit check

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

?2.

Disconnect the following connector.

VSA modulator-control unit 38P connector

?3.	Turn the vehicle to the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the VSA modulator-control unit.?


	NO

Reconnect the VSA modulator-control unit 38P connector with vehicle in OFF (LOCK) mode, then go to step 16.

16.

Steering angle sensor check:

Steering angle sensor check

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

?2.

Disconnect the following connector.

Steering angle sensor 4P connector

?3.	Turn the vehicle to the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the steering angle sensor.?


	NO (With display audio)

Reconnect the steering angle sensor 4P connector with vehicle in OFF (LOCK) mode, then go to step 17.


	NO (Without display audio)

Reconnect the steering angle sensor 4P connector with vehicle in OFF (LOCK) mode, then go to step 18.

17.

Audio unit or audio-navigation unit check:

Audio unit or audio-navigation unit check

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

?2.

Disconnect the following connector.

With navigation: Audio-navigation unit connector G (24P)

Without navigation: Audio unit connector G (24P)

?3.	Turn the vehicle to the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the audio-unit or the audio-navigation unit.?


	NO

Reconnect audio unit or audio-navigation unit connector G (24P) with vehicle in OFF (LOCK) mode, then go to step 18.

18.

EPS control unit check:

EPS control unit check

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

?2.

Disconnect the following connector.

EPS control unit connector A (11P)

?3.	Turn the vehicle to the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the EPS control unit.?


	NO (With real time AWD system)

Reconnect EPS control unit connector A (11P) with vehicle in OFF (LOCK) mode, then go to step 19.


	NO (Without real time AWD system)

Reconnect EPS control unit connector A (11P) with vehicle in OFF (LOCK) mode, then go to step 21.

19.

Real time AWD control unit check:

Real time AWD control unit check

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

?2.

Disconnect the following connector.

Real time AWD control unit 24P connector

?3.	Turn the vehicle to the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the real time AWD control unit.?


	NO (With ACC)

Reconnect the real time AWD control unit 24P connector with vehicle in OFF (LOCK) mode, then go to step 20.


	NO (Without ACC)

Reconnect the real time AWD control unit 24P connector with vehicle in OFF (LOCK) mode, then go to step 21.

20.

Multipurpose camera unit check:

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

?2.

Disconnect the following connector.

Multipurpose camera unit 20P connector

?3.	Turn the vehicle to the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the multipurpose camera unit.?


	NO

Reconnect the multipurpose camera unit 20P connector with vehicle in OFF (LOCK) mode, then go to step 21.

21.

SRS unit check:

SRS unit check

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

?2.	Do the 12 volt battery terminal disconnection procedure, and wait for at least 3 minutes.

?3.

Disconnect the following connector.

SRS unit connector A (39P)

?4.	Do the 12 volt battery terminal reconnection procedure.

?5.	Turn the vehicle to the ON mode, and read the HDS.

Does the HDS identify the vehicle?


	YES

Replace the SRS unit.?


	NO (Without keyless access system)

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 keyless access system)

	Substitute a known-good keyless access control unit, then recheck. If the HDS identifies the vehicle and the keyless access control unit was substituted, replace the original keyless access control 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.?