F-CAN Circuit Troubleshooting (2016 2017 2018)

F-CAN Circuit Troubleshooting

F-CAN circuit resistance check

-1. Turn the vehicle to the OFF (LOCK) 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	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
Test point 1	PCM connector A (51P) No. 3
Test point 2	PCM connector A (51P) No. 4

Is there about 78-95 Ω?

YES

Go to step 14.

Go to step 2.

Shorted wire check (F-CAN_H line to F-CAN_L line):

Disconnect the following connectors.

Gauge control module 32P connector
VSA modulator-control unit 21P connector
Steering angle sensor 4P connector
EPS control unit connector B (6P)
Keyless access control unit connector C (20P) (with keyless access system)
SRS unit connector A (39P) (SRS unt connector A (39P) type)
Audio unit connector C (24P) (with display audio)
Electric parking brake control unit 30P connector
AWD control unit 24P connector (AWD)
Multipurpose camera unit 12P connector (with FCW)

-2. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P) (with keyless access system): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	PCM connector A (51P) No. 3

Test point 2

PCM connector A (51P) No. 4

Is there continuity?

YES

Repair a short in the F-CAN_H wire to F-CAN_L wire between PCM terminals A3 and A4.

The F-CAN_H and F-CAN_L wires are not shorted. Go to step 3.

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 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P) (with keyless access system): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	Gauge control module 32P connector No. 21
Test point 2	PCM connector A (51P) No. 3

Is there continuity?

YES

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

Repair an open in the F-CAN_H wire between the PCM (A3) and the gauge control module.

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 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P) (with keyless access system): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	VSA modulator-control unit 21P connector No. 8
Test point 2	PCM connector A (51P) No. 3

Is there continuity?

YES

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

Repair an open in the F-CAN_H wire between the PCM (A3) and the VSA modulator-control unit.

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 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P) (with keyless access system): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	EPS control unit connector B (6P) No. 4
Test point 2	PCM connector A (51P) No. 3

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.

Repair an open in the F-CAN_H wire between the PCM (A3) and the EPS control unit.

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 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	Keyless access control unit connector C (20P) No. 2
Test point 2	PCM connector A (51P) No. 3

Is there continuity?

YES

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

Repair an open in the F-CAN_H wire between the PCM (A3) and the keyless access control unit.

Open wire check (F-CAN_H line) 5

-1. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P) (with keyless access system): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	SRS unit connector A (39P) No. 20 (SRS unit connector A (39P) type)
Test point 2	PCM connector A (51P) No. 3

Is there continuity?

YES

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

Repair an open in the F-CAN_H wire between the PCM (A3) and the SRS unit.

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 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P) (with keyless access system): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	Gauge control module 32P connector No. 22
Test point 2	PCM connector A (51P) No. 4

Is there continuity?

YES

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

Repair an open in the F-CAN_L wire between the PCM (A4) and the gauge control module.

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 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected

	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P) (with keyless access system): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	VSA modulator-control unit 21P connector No. 15
Test point 2	PCM connector A (51P) No. 4

Is there continuity?

YES

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

Repair an open in the F-CAN_L wire between the PCM (A4) and the VSA modulator-control unit.

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 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P) (with keyless access system): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	EPS control unit connector B (6P) No. 3
Test point 2	PCM connector A (51P) No. 4

Is there continuity?

YES (with keyless access system)

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

YES (without keyless access system)

The F-CAN_L wire is not open. Go to step 12.

Repair an open in the F-CAN_L wire between the PCM (A4) and the EPS control unit.

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 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	Keyless access control unit connector C (20P) No. 12
Test point 2	PCM connector A (51P) No. 4

Is there continuity?

YES

The F-CAN_L wire is not open. Go to step 12.

Repair an open in the F-CAN_L wire between the PCM (A4) and the keyless access control unit.

Open wire check (F-CAN_L line) 5

-1. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P) (with keyless access system): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	SRS unit connector A (39P) No. 21 (SRS unit connector A (39P) type)
Test point 2	PCM connector A (51P) No. 4

Is there continuity?

YES

The F-CAN_L wire is not open. Go to step 13.

Repair an open in the F-CAN_L wire between the PCM (A4) and the SRS unit.

Electric parking brake control unit internal resistance check

-1. Reconnect the electric parking brake control unit 30P connector.

-2. Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P) (with keyless access system): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	PCM connector A (51P) No. 3
Test point 2	PCM connector A (51P) No. 4

Is there about 112-136 Ω?

YES

The electric parking brake control unit is OK. Go to step 14.

Replace the electric parking brake control unit .

Shorted wire check (F-CAN_H line):

Disconnect the following connectors.

Gauge control module 32P connector
VSA modulator-control unit 21P connector
Steering angle sensor 4P connector
EPS control unit connector B (6P)
Keyless access control unit connector C (20P) (with keyless access system)
SRS unit connector A (39P) (SRS unit connector A (39P) type)
Audio unit connector C (24P) (with display audio)
Electric parking brake control unit 30P connector
AWD control unit 24P connector (AWD)
Multipurpose camera unit 12P connector (with FCW)

-2. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	Gauge control module 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P) (with keyless access system): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	PCM connector A (51P) No. 3
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 keyless access control unit, the SRS unit, the audio unit, the electric parking brake control unit, the AWD control unit, the multipurpose camera unit, or the DLC.

The F-CAN_H wire is OK. Go to step 15.

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 32P connector: disconnected
	VSA modulator-control unit 21P connector: disconnected
	Steering angle sensor 4P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Keyless access control unit connector C (20P) (with keyless access system): disconnected
	SRS unit connector A (39P): disconnected
	Audio unit connector C (24P) (with display audio): disconnected
	Electric parking brake control unit 30P connector: disconnected
	AWD control unit 24P connector (AWD): disconnected
	Multipurpose camera unit 12P connector (with FCW): disconnected
Test point 1	PCM connector A (51P) No. 4
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 keyless access control unit, the SRS unit, the audio unit, electric parking brake control unit, the AWD control unit, the multipurpose camera unit, or the DLC.

The F-CAN_L wire is OK. Go to step 16.

Gauge control module check
-1. Reconnect all connectors.

-2. Connect the HDS to the DLC.

-3. Disconnect the following connector.

Gauge control module 32P connector

-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 the gauge control module 32P connector with vehicle in OFF (LOCK) mode, then go to step 17.
VSA modulator-control unit check
-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Disconnect the following connector.

VSA modulator-control unit 21P 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 21P connector with vehicle in OFF (LOCK) mode, then go to step 18.
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 19.

NO (without display audio)

Reconnect the steering angle sensor 4P connector with vehicle in OFF (LOCK) mode, then go to step 20.
Audio unit check
-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Disconnect the following connector.

Audio unit connector C (24P)

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

Does the HDS identify the vehicle?

YES

Replace the audio unit .

NO

Reconnect audio unit connector C (24P) with vehicle in OFF (LOCK) mode, then go to step 20.
EPS control unit check
-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Disconnect the following connector.

EPS control unit connector B (6P)

-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 FCW)

Reconnect EPS control unit connector B (6P) with vehicle in OFF (LOCK) mode, then go to step 21.

NO (without FCW)

Reconnect EPS control unit connector B (6P) with vehicle in OFF (LOCK) mode, then go to step 22.
Multipurpose camera unit check
-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Disconnect the following connector.

Multipurpose camera unit 12P 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 12P connector with vehicle in OFF (LOCK) mode, then go to step 22.
Electric parking brake control unit check
-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Disconnect the following connector.

Electric parking brake control unit 30P connector

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

Does the HDS identify the vehicle?

YES

Replace the electric parking brake control unit .

NO(2WD)

Reconnect the electric parking brake control unit 30P connector with vehicle in OFF (LOCK) mode, then go to step 23.

NO (AWD)

Reconnect the electric parking brake control unit 30P connector with vehicle in OFF (LOCK) mode, then go to step 23.
AWD control unit check
-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Disconnect the following connector.

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 AWD control unit .

NO

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