F-CAN Circuit Troubleshooting (L15B7/L15BA/L15BY: Without CAN gateway)

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 (50P)

?4.

Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
Test point 1	PCM connector A (50P) No. 36
Test point 2	PCM connector A (50P) No. 37

Is there about 85?107 ? (CVT), 88?111 ? (M/T)?


	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)
	Audio unit connector E (16P) (display audio type, without navigation)
	Audio-navigation unit connector E (16P) (with navigation)
	TCM 50P connector (CVT)

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	PCM connector A (50P) No. 36
Test point 2	PCM connector A (50P) No. 37

Is there continuity?


	YES

Repair a short in the F-CAN_H wire to F-CAN_L wire between the PCM terminals A36 and A37.?


	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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	Gauge control module connector A (32P) No. 19
Test point 2	PCM connector A (50P) No. 37

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 (A37) 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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	VSA modulator-control unit 46P connector No. 20
Test point 2	PCM connector A (50P) No. 37

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 (A37) 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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	EPS control unit connector B (6P) No. 3
Test point 2	PCM connector A (50P) No. 37

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 (A37) 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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	SRS unit connector A (39P) No. 34
Test point 2	PCM connector A (50P) No. 37

Is there continuity?


	YES (CVT)

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


	YES (M/T)

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


	NO

Repair an open in the F-CAN_H wire between the PCM (A37) and the SRS unit.?

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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector: disconnected
Test point 1	TCM 50P connector No. 3
Test point 2	PCM connector A (50P) No. 37

Is there continuity?


	YES

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


	NO

Repair an open in the F-CAN_H wire between the PCM (A37) and the TCM.?

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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	Body control module connector B (36P) No. 22
Test point 2	PCM connector A (50P) No. 37

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 (A37) and the body control module.?

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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected: disconnected
Test point 1	Gauge control module connector A (32P) No. 20
Test point 2	PCM connector A (50P) No. 36

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 (A36) 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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	VSA modulator-control unit 46P connector No. 21
Test point 2	PCM connector A (50P) No. 36

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 (A36) 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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	EPS control unit connector B (6P) No. 1
Test point 2	PCM connector A (50P) No. 36

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 (A36) 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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	SRS unit connector A (39P) No. 35
Test point 2	PCM connector A (50P) No. 36

Is there continuity?


	YES (CVT)

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


	YES (M/T)

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


	NO

Repair an open in the F-CAN_L wire between the PCM (A36) and the SRS unit.?

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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector: disconnected
Test point 1	TCM 50P connector No. 11
Test point 2	PCM connector A (50P) No. 36

Is there continuity?


	YES

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


	NO

Repair an open in the F-CAN_L wire between the PCM (A36) and the TCM.?

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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	Body control module connector B (36P) No. 23
Test point 2	PCM connector A (50P) No. 36

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 (A36) and the body control module.?

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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	PCM connector A (50P) No. 36
Test point 2	PCM connector A (50P) No. 37

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)
	Audio unit connector E (16P) (display audio type, without navigation)
	Audio-navigation unit connector E (16P) (with navigation)
	TCM 50P connector (CVT)

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	PCM connector A (50P) No. 37
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the F-CAN_H wire between the PCM (A37) and the gauge control module, the VSA modulator-control unit, the EPS control unit, the body control module, the SRS unit, the audio unit, the audio-navigation unit, the TCM, 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 (50P): 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
	Audio unit connector E (16P) (display audio type, without navigation): disconnected
	Audio-navigation unit connector E (16P) (with navigation): disconnected
	TCM 50P connector (CVT): disconnected
Test point 1	PCM connector A (50P) No. 36
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the F-CAN_L wire between the PCM (A36) and the gauge control module, the VSA modulator-control unit, the EPS control unit, the body control module, the SRS unit, the audio unit, the audio-navigation unit, the TCM, 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

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

19.

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 (with navigation)

Reconnect the VSA modulator-control unit 46P connector with vehicle in OFF (LOCK) mode, then go to step 21.


	NO (without display audio type)

Reconnect the VSA modulator-control unit 46P connector with vehicle in OFF (LOCK) mode, then go to step 22.


	OK (display audio type, without navigation)

Reconnect the VSA modulator-control unit 46P connector with vehicle in OFF (LOCK) mode, then go to step 20.

20.

Audio unit check:

Audio unit check

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

?2.

Disconnect the following connector.

Audio unit connector E (16P)

?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 E (16P) with vehicle in OFF (LOCK) mode, then go to step 22.

21.

Audio-navigation unit check:

Audio-navigation unit check

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

?2.

Disconnect the following connector.

Audio-navigation unit connector E (16P)

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

Does the HDS identify the vehicle?


	YES

Replace the audio-navigation unit.?


	NO

Reconnect audio-navigation unit connector E (16P) with vehicle in OFF (LOCK) mode, then go to step 22.

22.

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 (CVT)

Reconnect EPS control unit connector B (6P) with vehicle in OFF (LOCK) mode, then go to step 23.


	NO (M/T)

Reconnect EPS control unit connector B (6P) with vehicle in OFF (LOCK) mode, then go to step 24.

23.

TCM check:

TCM check

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

?2.

Disconnect the following connector.

TCM 50P connector

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

Does the HDS identify the vehicle?


	YES

Replace the TCM.?


	NO

Reconnect the TCM 50P connector with vehicle in OFF (LOCK) mode, then go to step 24.

24.

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

	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, then recheck. If the HDS identifies the vehicle and the PCM was substituted, replace the original PCM.?