F-CAN Circuit Troubleshooting (2.4 L Engine) (2017 2018 2019)

NOTE: 

• Before disconnecting the SRS unit connector, do the 12 volt battery terminal disconnection procedure , and wait for at least 3 minutes.
• Before disconnecting the electric brake booster connector, turn the vehicle to the OFF (LOCK) mode with driver's door open, then wait 3 minutes. Do not open and close the driver's door.

1. 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 Ω?

   YES 

   Go to step  16.

   NO 

   Go to step 2.

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

   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

   -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

   -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

   -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

   -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

   -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

   -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

   -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

    -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

    -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

    -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

    -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

    -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

    -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 Ω?

    YES 

    Go to step 16.

    NO 

    Replace the VSA modulator-control unit .

16. Shorted wire check (F-CAN_H line):

    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)

    -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

    -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

    -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

    -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

    -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

    -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 .