F-CAN Circuit Troubleshooting (2.4 L Engine)

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. 1
Test point 2	PCM connector A (51P) No. 2

Is there about 85?107 ??


	YES

Go to step 16.


	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 46P connector
	EPS control unit connector B (6P)
	Body control module connector B (36P)
	SRS unit connector A (39P)
	Electric brake booster 26P connector
	Real time AWD control unit 24P connector (with AWD)

?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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): 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 the 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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): 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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): disconnected
Test point 1	VSA modulator-control unit 46P connector No. 40
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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): disconnected
Test point 1	EPS control unit connector B (6P) No. 3
Test point 2	PCM connector A (51P) No. 2

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 (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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): disconnected
Test point 1	Electric brake booster 26P connector No. 26
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 electric brake booster.?

7.

Open wire check (F-CAN_H line) 5:

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 connector A (32P): disconnected
	VSA modulator-control unit 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): disconnected
Test point 1	Body control module connector B (36P) No. 22
Test point 2	PCM connector A (51P) No. 2

Is there continuity?


	YES (with AWD)

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


	YES (without real time AWD)

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


	NO

Repair an open in the F-CAN_H wire between the PCM (A2) and the body control module.?

8.

Open wire check (F-CAN_H line) 6:

Open wire check (F-CAN_H line) 6

?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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): disconnected
Test point 1	Real time AWD control unit 24P connector No. 14
Test point 2	PCM connector A (51P) No. 2

Is there continuity?


	YES

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


	NO

Repair an open in the F-CAN_H wire between the PCM (A2) and the real time AWD control unit.?

9.

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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): 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 10.


	NO

Repair an open in the F-CAN_L wire between the PCM (A1) and the gauge control module.?

10.

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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): disconnected
Test point 1	VSA modulator-control unit 46P connector No. 28
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 VSA modulator-control unit.?

11.

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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): disconnected
Test point 1	EPS control unit connector B (6P) No. 1
Test point 2	PCM connector A (51P) No. 1

Is there continuity?


	YES

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


	NO

Repair an open in the F-CAN_L wire between the PCM (A1) and the EPS control unit.?

12.

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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): disconnected
Test point 1	Electric brake booster 26P connector No. 18
Test point 2	PCM connector A (51P) No. 1

Is there continuity?


	YES

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


	NO

Repair an open in the F-CAN_L wire between the PCM (A1) and the electric brake booster.?

13.

Open wire check (F-CAN_L line) 5:

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 connector A (32P): disconnected
	VSA modulator-control unit 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): disconnected
Test point 1	Body control module connector B (36P) No. 23
Test point 2	PCM connector A (51P) No. 1

Is there continuity?


	YES (with AWD)

The F-CAN_L wire is not open. Go to step 14.


	YES (without real time AWD)

The F-CAN_L wire is not open. Go to step 15.


	NO

Repair an open in the F-CAN_L wire between the PCM (A1) and the body control module.?

14.

Open wire check (F-CAN_L line) 6:

Open wire check (F-CAN_L line) 6

?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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): disconnected
Test point 1	Real time AWD control unit 24P connector No. 24
Test point 2	PCM connector A (51P) No. 1

Is there continuity?


	YES

The F-CAN_L wire is not open. Go to step 15.


	NO

Repair an open in the F-CAN_L wire between the PCM (A1) and the real time AWD control unit.?

15.

VSA modulator-control unit internal resistance check:

VSA modulator-control unit internal resistance check

?1.	Reconnect VSA modulator-control unit 46P 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 connector A (32P): disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): disconnected
Test point 1	PCM connector A (51P) No. 1
Test point 2	PCM connector A (51P) No. 2

Is there about 112?136 ??


	YES

Go to step 16.


	NO

Replace the VSA modulator-control unit.?

16.

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 46P connector
	EPS control unit connector B (6P)
	Body control module connector B (36P)
	SRS unit connector A (39P)
	Electric brake booster 26P connector
	Real time AWD control unit 24P connector

?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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): 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 EPS control unit, the body control module, the SRS unit, the electric brake booster, the real time AWD control unit, or the DLC.?


	NO

The F-CAN_H wire is OK. Go to step 17.

17.

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 46P connector: disconnected
	EPS control unit connector B (6P): disconnected
	Body control module connector B (36P): disconnected
	SRS unit connector A (39P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector (with AWD): 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 EPS control unit, the body control module, the SRS unit, the electric brake booster, the real time AWD control unit, or the DLC.?


	NO

The F-CAN_L wire is OK. Go to step 18.

18.

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 (without real time AWD)

Reconnect gauge control module connector A (32P) with vehicle in OFF (LOCK) mode, then go to step 20.


	NO (with AWD)

Reconnect gauge control module connector A (32P) with vehicle in OFF (LOCK) mode, then go to step 19.

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

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

20.

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 46P 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 46P connector with vehicle in OFF (LOCK) mode, then go to step 21.

21.

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 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

Reconnect EPS control unit connector B (6P) with vehicle in OFF (LOCK) mode, then go to step 22.

22.

Electric brake booster check:

Electric brake booster check

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

?2.

Disconnect the following connector.

Electric brake booster 26P connector

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

Does the HDS identify the vehicle?


	YES

Replace the electric brake booster.?


	NO

	Substitute a known-good body control module, then recheck. If the HDS identifies the vehicle and the body control module was substituted, replace the original body control module.?
	Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM.?