F-CAN Circuit Troubleshooting CR-V...8237

Engine

F-CAN Circuit Troubleshooting

ElectronicCircuitSchematics-button

F-CAN Circuit Troubleshooting

1- F-CAN circuit resistance check:

F-CAN circuit resistance check

1- Turn the ignition switch to LOCK (0)- 2- Jump the SCS line with the HDS- SCS Short

3- Disconnect the following connector- PCM connector A (49P)

4- Disconnect the HDS- 5- Measure the resistance between test points 1 and 2- Test condition

IG LOCK (0)

PCM connector A (49P): disconnected

Test circuit

F CAN-H, F CAN-L

Test point 1

PCM connector A (49P) No. 3 (WHT)

Test point 2

PCM connector A (49P) No. 4 (RED)

Is there about 48 62

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- NOTE: Before disconnecting SRS unit connector A (39P), do the battery terminal disconnection procedure and wait for at least 3 minutes-

Gauge control module 32P connector

VSA modulator-control unit 38P connector

Steering angle sensor 4P connector

EPS control unit connector A (11P)

Real time AWD control unit 24P connector (with real time AWD)

SRS unit connector A (39P)

Audio-navigation unit connector B (20P) (with navigation)

2- Check for continuity between test points 1 and 2- Test condition

IG LOCK (0)

PCM connector A (49P): disconnected

Gauge control module 32P connector: disconnected

VSA modulator-control unit 38P connector: disconnected

Steering angle sensor 4P connector: disconnected

EPS control unit connector A (11P): disconnected

Real time AWD control unit 24P connector (with real time AWD): disconnected

SRS unit connector A (39P): disconnected

Audio-navigation unit connector B (20P) (with navigation): disconnected

Test circuit

F CAN-H, F CAN-L

Test point 1

PCM connector A (49P) No. 3 (WHT)

Test point 2

PCM connector A (49P) No. 4 (RED)

Is there continuity

YES

Repair a short in the F CAN-H wire to the F CAN-L wire between PCM terminals A3 and A4.

NO

The F CAN-H wire and the F CAN-L wire 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

IG LOCK (0)

PCM connector A (49P): disconnected

Gauge control module 32P connector: disconnected

VSA modulator-control unit 38P connector: disconnected

Steering angle sensor 4P connector: disconnected

EPS control unit connector A (11P): disconnected

Real time AWD control unit 24P connector (with real time AWD): disconnected

SRS unit connector A (39P): disconnected

Audio-navigation unit connector B (20P) (with navigation): disconnected

Test circuit

F CAN-H

Test point 1

PCM connector A (49P) No. 3 (WHT)

Test point 2

Gauge control module 32P connector No. 19 (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 (A3) 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

IG LOCK (0)

PCM connector A (49P): disconnected

Gauge control module 32P connector: disconnected

VSA modulator-control unit 38P connector: disconnected

Steering angle sensor 4P connector: disconnected

Real time AWD control unit 24P connector (with real time AWD): disconnected

EPS control unit connector A (11P): disconnected

SRS unit connector A (39P): disconnected

Audio-navigation unit connector B (20P) (with navigation): disconnected

Test circuit

F CAN-H

Test point 1

PCM connector A (49P) No. 3 (WHT)

Test point 2

VSA modulator-control unit 38P connector No. 38 (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 (A3) 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

IG LOCK (0)

PCM connector A (49P): disconnected

Gauge control module 32P connector: disconnected

VSA modulator-control unit 38P connector: disconnected

Steering angle sensor 4P connector: disconnected

EPS control unit connector A (11P): disconnected

Real time AWD control unit 24P connector (with real time AWD): disconnected

SRS unit connector A (39P): disconnected

Audio-navigation unit connector B (20P) (with navigation): disconnected

Test circuit

F CAN-H

Test point 1

PCM connector A (49P) No. 3 (WHT)

Test point 2

EPS control unit connector A (11P) No. 7 (WHT)

Is there continuity

YES (with real time AWD)

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

YES (without real time AWD)

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 (A3) 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

IG LOCK (0)

PCM connector A (49P): disconnected

Gauge control module 32P connector: disconnected

VSA modulator-control unit 38P connector: disconnected

Steering angle sensor 4P connector: disconnected

EPS control unit connector A (11P): disconnected

Real time AWD control unit 24P connector (with real time AWD): disconnected

SRS unit connector A (39P): disconnected

Audio-navigation unit connector B (20P) (with navigation): disconnected

Test circuit

F CAN-H

Test point 1

PCM connector A (49P) No. 3 (WHT)

Test point 2

Real time AWD control unit 24P No. 14 (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 (A3) and the real time AWD 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

IG LOCK (0)

PCM connector A (49P): disconnected

Gauge control module 32P connector: disconnected

VSA modulator-control unit 38P connector: disconnected

Steering angle sensor 4P connector: disconnected

EPS control unit connector A (11P): disconnected

Real time AWD control unit 24P connector (with real time AWD): disconnected

SRS unit connector A (39P): disconnected

Audio-navigation unit connector B (20P) (with navigation): disconnected

Test circuit

F CAN-L

Test point 1

PCM connector A (49P) No. 4 (RED)

Test point 2

Gauge control module 32P connector No. 20 (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 (A4) 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

IG LOCK (0)

PCM connector A (49P): disconnected

Gauge control module 32P connector: disconnected

VSA modulator-control unit 38P connector: disconnected

Steering angle sensor 4P connector: disconnected

EPS control unit connector A (11P): disconnected

Real time AWD control unit 24P connector (with real time AWD): disconnected

SRS unit connector A (39P): disconnected

Audio-navigation unit connector B (20P) (with navigation): disconnected

Test circuit

F CAN-L

Test point 1

PCM connector A (49P) No. 4 (RED)

Test point 2

VSA modulator-control unit 38P connector No. 26 (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 (A4) 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

IG LOCK (0)

PCM connector A (49P): disconnected

Gauge control module 32P connector: disconnected

VSA modulator-control unit 38P connector: disconnected

Steering angle sensor 4P connector: disconnected

EPS control unit connector A (11P): disconnected

Real time AWD control unit 24P connector (with real time AWD): disconnected

SRS unit connector A (39P): disconnected

Audio-navigation unit connector B (20P) (with navigation): disconnected

Test circuit

F CAN-L

Test point 1

PCM connector A (49P) No. 4 (RED)

Test point 2

EPS control unit connector A (11P) No. 9 (RED)

Is there continuity

YES (with real time AWD)

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

YES (without real time AWD)

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 (A4) 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

IG LOCK (0)

PCM connector A (49P): disconnected

Gauge control module 32P connector: disconnected

VSA modulator-control unit 38P connector: disconnected

Steering angle sensor 4P connector: disconnected

EPS control unit connector A (11P): disconnected

Real time AWD control unit 24P connector (with real time AWD): disconnected

SRS unit connector A (39P): disconnected

Audio-navigation unit connector B (20P) (with navigation): disconnected

Test circuit

F CAN-L

Test point 1

PCM connector A (49P) No. 4 (RED)

Test point 2

Real time AWD control unit 24P No. 24 (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 (A4) and the real time AWD control unit.

11- VSA modulator-control unit internal resistance check:

VSA modulator-control unit internal resistance check

1- Reconnect VSA modulator-control unit 38P connector- 2- Measure the resistance between test points 1 and 2- Test condition

IG LOCK (0)

PCM connector A (49P): disconnected

Gauge control module 32P connector: disconnected

Steering angle sensor 4P connector: disconnected

EPS control unit connector A (11P): disconnected

Real time AWD control unit 24P connector (with real time AWD): disconnected

SRS unit connector A (39P): disconnected

Audio-navigation unit connector B (20P) (with navigation): disconnected

Test circuit

F CAN-H, F CAN-L

Test point 1

PCM connector A (49P) No. 3 (WHT)

Test point 2

PCM connector A (49P) No. 4 (RED)

Is there about 108 132

YES

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

NO

Replace the original VSA modulator-control unit.

12- Shorted wire check (F CAN-H line):

Shorted wire check (F CAN-H line)

1- Disconnect the following connectors:

NOTE: Before disconnecting SRS unit connector A (39P), do the battery terminal disconnection procedure and wait for at least 3 minutes-

Gauge control module 32P connector

VSA modulator-control unit 38P connector

Steering angle sensor 4P connector

EPS control unit connector A (11P)

Real time AWD control unit 24P connector (with real time AWD): disconnected

SRS unit connector A (39P)

Audio-navigation unit connector B (20P) (with navigation)

2- Check for continuity between test points 1 and 2- Test condition

IG LOCK (0)

PCM connector A (49P): disconnected

Gauge control module 32P connector: disconnected

VSA modulator-control unit 38P connector: disconnected

Steering angle sensor 4P connector: disconnected

EPS control unit connector A (11P): disconnected

Real time AWD control unit 24P connector (with real time AWD): disconnected

SRS unit connector A (39P): disconnected

Audio-navigation unit connector B (20P) (with navigation): disconnected

Test circuit

F CAN-H

Test point 1

PCM connector A (49P) No. 3 (WHT)

Test point 2

Body ground

Is there continuity

YES

Repair a short in the F CAN-H wire between the PCM (A3) and the gauge control module, the VSA modulator-control unit, the steering angle sensor, the EPS control unit, the real time AWD control unit, the SRS unit, the audio-navigation 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

IG LOCK (0)

Test circuit

F CAN-L

Test point 1

PCM connector A (49P) No. 4 (RED)

Test point 2

Body ground

Test condition

IG LOCK (0)

PCM connector A (49P): disconnected

Gauge control module 32P connector: disconnected

VSA modulator-control unit 38P connector: disconnected

Steering angle sensor 4P connector: disconnected

EPS control unit connector A (11P): disconnected

Real time AWD control unit 24P connector (with real time AWD): disconnected

SRS unit connector A (39P): disconnected

Audio-navigation unit connector B (20P) (with navigation): disconnected

Test circuit

F CAN-L

Test point 1

PCM connector A (49P) No. 4 (RED)

Test point 2

Body ground

Is there continuity

YES

Repair a short in the F CAN-L wire between the PCM (A4) and the gauge control module, the VSA modulator-control unit, the steering angle sensor, the EPS control unit, the real time AWD control unit, the SRS unit, the audio-navigation 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- Do the battery terminal reconnection procedure- 3- Connect the HDS to the DLC- 4- Disconnect the following connector- Gauge control module 32P connector

5- Turn the ignition switch to ON (II), 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- Turn the ignition switch to LOCK (0)- 2- Reconnect the gauge control module 32P connector- 3- Disconnect the following connector- VSA modulator-control unit 38P connector

4- Turn the ignition switch to ON (II)- 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- Turn the ignition switch to LOCK (0)- 2- Reconnect the VSA modulator-control unit 38P connector- 3- Disconnect the following connector- Steering angle sensor 4P connector

4- Turn the ignition switch to ON (II), and read the HDS- Does the HDS identify the vehicle

YES

Replace the steering angle sensor.

NO

Go to step 17- 17- EPS control unit check:

EPS control unit check

1- Turn the ignition switch to LOCK (0)- 2- Reconnect the steering angle sensor 4P connector- 3- Disconnect the following connector- EPS control unit connector A (11P)

4- Turn the ignition switch to ON (II), and read the HDS- Does the HDS identify the vehicle

YES

Replace the EPS control unit.

NO (with real time AWD)

Go to step 18-

NO (without real time AWD)

Go to step 19- 18- Real time AWD control unit check:

Real time AWD control unit check

1- Turn the ignition switch to LOCK (0)- 2- Reconnect EPS control unit connector A (11P)- 3- Disconnect the following connector- Real time AWD control unit 24P connector

4- Turn the ignition switch to ON (II), and read the HDS- Does the HDS identify the vehicle

YES

Replace the real time AWD control unit.

NO

Go to step 19- 19- SRS unit check:

SRS unit check

1- Turn the ignition switch to LOCK (0)- 2- Reconnect EPS control unit connector A (11P) or real time AWD control unit 24P connector- 3- Do the battery terminal disconnection procedure and wait for at least 3 minutes- 4- Disconnect the following connector- SRS unit connector A (39P)

5- Do the battery terminal reconnection procedure- 6- Turn the ignition switch to ON (II), and read the HDS- Does the HDS identify the vehicle

YES

Replace the SRS unit.

NO (with navigation)

Go to step 20-

NO (without navigation)

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.

20- Audio-navigation unit check:

Audio-navigation unit check

1- Turn the ignition switch to LOCK (0)- 2- Reconnect SRS unit connector A (39P)- 3- Disconnect the following connector- Audio-navigation unit connector B (20P)

4- Turn the ignition switch to ON (II), and read the HDS- Does the HDS identify the vehicle

YES

Replace the audio-navigation unit.

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.

Troubleshooting Start
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