F-CAN Circuit Troubleshooting
F-CAN Circuit Troubleshooting
1.
F-CAN circuit resistance check:

F-CAN circuit resistance check
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.

?4.
Measure the resistance between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
 
PCM connector A (51P): disconnected
Test circuit
F CAN-H, F CAN-L
Test point 1
PCM connector A (51P) No. 2 (WHT)
Test point 2
PCM connector A (51P) No. 1 (RED)


Is there about 55?65 ??

     
YES
     
     
     
Go to step 10
     
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.

?2.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
 
PCM connector A (51P): disconnected
 
Gauge control module connector A (32P): disconnected
 
VSA modulator-control unit 21P connector: disconnected
 
Steering angle sensor 4P connector: disconnected
 
EPS control unit connector A (11P): disconnected
 
Keyless access control unit connector C (24P): disconnected
 
SRS unit connector A (39P): disconnected
 
Audio-navigation unit connector D (18P) (with navigation): disconnected
 
ANC/active sound control unit 20P connector: disconnected
Test circuit
F CAN-H, F CAN-L
Test point 1
PCM connector A (51P) No. 2 (WHT)
Test point 2
PCM connector A (51P) No. 1 (RED)


Is there continuity?

     
YES
     
     
     
Repair a short in the F CAN-H wire to F CAN-L wire between 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
IG LOCK (0) or OFF mode
 
PCM connector A (51P): disconnected
 
Gauge control module connector A (32P): disconnected
 
VSA modulator-control unit 21P connector: disconnected
 
Steering angle sensor 4P connector: disconnected
 
EPS control unit connector A (11P): disconnected
 
Keyless access control unit connector C (24P): disconnected
 
SRS unit connector A (39P): disconnected
 
Audio-navigation unit connector D (18P) (with navigation): disconnected
 
ANC/active sound control unit 20P connector: disconnected
Test circuit
F CAN-H
Test point 1
Gauge control module connector A (32P) No. 19 (WHT)
Test point 2
PCM connector A (51P) No. 2 (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 (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
IG LOCK (0) or OFF mode
 
PCM connector A (51P): disconnected
 
Gauge control module connector A (32P): disconnected
 
VSA modulator-control unit 21P connector: disconnected
 
Steering angle sensor 4P connector: disconnected
 
EPS control unit connector A (11P): disconnected
 
Keyless access control unit connector C (24P): disconnected
 
SRS unit connector A (39P): disconnected
 
Audio-navigation unit connector D (18P) (with navigation): disconnected
 
ANC/active sound control unit 20P connector: disconnected
Test circuit
F CAN-H
Test point 1
VSA modulator-control unit 21P connector No. 8 (WHT)
Test point 2
PCM connector A (51P) No. 2 (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 (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
IG LOCK (0) or OFF mode
 
PCM connector A (51P): disconnected
 
Gauge control module connector A (32P): disconnected
 
VSA modulator-control unit 21P connector: disconnected
 
Steering angle sensor 4P connector: disconnected
 
EPS control unit connector A (11P): disconnected
 
Keyless access control unit connector C (24P): disconnected
 
SRS unit connector A (39P): disconnected
 
Audio-navigation unit connector D (18P) (with navigation): disconnected
 
ANC/active sound control unit 20P connector: disconnected
Test circuit
F CAN-H
Test point 1
EPS control unit connector A (11P) No. 10 (WHT)
Test point 2
PCM connector A (51P) No. 2 (WHT)


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-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) or OFF mode
 
PCM connector A (51P): disconnected
 
Gauge control module connector A (32P): disconnected
 
VSA modulator-control unit 21P connector: disconnected
 
Steering angle sensor 4P connector: disconnected
 
EPS control unit connector A (11P): disconnected
 
Keyless access control unit connector C (24P): disconnected
 
SRS unit connector A (39P): disconnected
 
Audio-navigation unit connector D (18P) (with navigation): disconnected
 
ANC/active sound control unit 20P connector: disconnected
Test circuit
F CAN-L
Test point 1
Gauge control module connector A (32P) No. 20 (RED)
Test point 2
PCM connector A (51P) No. 1 (RED)


Is there continuity?

     
YES
     
     
     
The F CAN-L wire is not open. Go to step 7.
     
NO
     
     
     
Repair an open in the F CAN-L wire between the PCM (A1) and the gauge control module.?
7.
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) or OFF mode
 
PCM connector A (51P): disconnected
 
Gauge control module connector A (32P): disconnected
 
VSA modulator-control unit 21P connector: disconnected
 
Steering angle sensor 4P connector: disconnected
 
EPS control unit connector A (11P): disconnected
 
Keyless access control unit connector C (24P): disconnected
 
SRS unit connector A (39P): disconnected
 
Audio-navigation unit connector D (18P) (with navigation): disconnected
 
ANC/active sound control unit 20P connector: disconnected
Test circuit
F CAN-L
Test point 1
VSA modulator-control unit 21P connector No. 15 (RED)
Test point 2
PCM connector A (51P) No. 1 (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 (A1) and the VSA modulator-control unit.?
8.
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) or OFF mode
 
PCM connector A (51P): disconnected
 
Gauge control module connector A (32P): disconnected
 
VSA modulator-control unit 21P connector: disconnected
 
Steering angle sensor 4P connector: disconnected
 
EPS control unit connector A (11P): disconnected
 
Keyless access control unit connector C (24P): disconnected
 
SRS unit connector A (39P): disconnected
 
Audio-navigation unit connector D (18P) (with navigation): disconnected
 
ANC/active sound control unit 20P connector: disconnected
Test circuit
F CAN-L
Test point 1
EPS control unit connector A (11P) No. 11 (RED)
Test point 2
PCM connector A (51P) No. 1 (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 (A1) and the EPS control unit.?
9.
VSA modulator-control unit internal resistance check:

VSA modulator-control unit internal resistance check
?1.
Reconnect VSA modulator-control unit 21P connector.

?2.
Measure the resistance between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
 
PCM connector A (51P): disconnected
 
Gauge control module connector A (32P): disconnected
 
Steering angle sensor 4P connector: disconnected
 
EPS control unit connector A (11P): disconnected
 
Keyless access control unit connector C (24P): disconnected
 
SRS unit connector A (39P): disconnected
 
Audio-navigation unit connector D (18P) (with navigation): disconnected
 
ANC/active sound control unit 20P connector: disconnected
Test circuit
F CAN-H, F CAN-L
Test point 1
PCM connector A (51P) No. 2 (WHT)
Test point 2
PCM connector A (51P) No. 1 (RED)


Is there about 108?132 ??

     
YES
     
     
     
The VSA modulator-control unit is OK. Go to step 10.
     
NO
     
     
     
10.
Shorted wire check (F CAN-H line):

Shorted wire check (F CAN-H line)
?1.
Disconnect the following connectors.

?2.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
 
PCM connector A (51P): disconnected
 
Gauge control module connector A (32P): disconnected
 
VSA modulator-control unit 21P connector: disconnected
 
Steering angle sensor 4P connector: disconnected
 
EPS control unit connector A (11P): disconnected
 
Keyless access control unit connector C (24P): disconnected
 
SRS unit connector A (39P): disconnected
 
Audio-navigation unit connector D (18P) (with navigation): disconnected
 
ANC/active sound control unit 20P connector: disconnected
Test circuit
F CAN-H
Test point 1
PCM connector A (51P) No. 2 (WHT)
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 steering angle sensor, the EPS control unit, the keyless access control unit, the SRS unit, the ANC/active sound control unit, the audio-navigation unit, or the DLC.?
     
NO
     
     
     
The F CAN-H wire is OK. Go to step 11.
11.
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) or OFF mode
 
PCM connector A (51P): disconnected
 
Gauge control module connector A (32P): disconnected
 
VSA modulator-control unit 21P connector: disconnected
 
Steering angle sensor 4P connector: disconnected
 
EPS control unit connector A (11P): disconnected
 
Keyless access control unit connector C (24P): disconnected
 
SRS unit connector A (39P): disconnected
 
Audio-navigation unit connector D (18P) (with navigation): disconnected
 
ANC/active sound control unit 20P connector: disconnected
Test circuit
F CAN-L
Test point 1
PCM connector A (51P) No. 1 (RED)
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 steering angle sensor, the EPS control unit, the keyless access control unit, the SRS unit, the ANC/active sound control unit, the audio-navigation unit, or the DLC.?
     
NO
     
     
     
The F CAN-L wire is OK. Go to step 12.
12.
Gauge control module check:

Gauge control module check
?1.
Reconnect all connectors.

?2.
Connect the HDS to the DLC.

?3.
Disconnect the following connector.

?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

     
YES
     
     
     
     
NO
     
     
     
Go to step 13.
13.
VSA modulator-control unit check:

VSA modulator-control unit check
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Reconnect the gauge control module connector A (32P).

?3.
Disconnect the following connector.

?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

     
YES
     
     
     
     
NO
     
     
     
Go to step 14.
14.
Steering angle sensor check:

Steering angle sensor check
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Reconnect the VSA modulator-control unit 21P connector.

?3.
Disconnect the following connector.

?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

     
YES
     
     
     
     
NO (with navigation)
     
     
     
Go to step 15.
     
NO (without navigation)
     
     
     
Go to step 16.
15.
Navigation unit check:

Navigation unit check
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Reconnect the steering angle sensor 4P connector.

?3.
Disconnect the following connector.

?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

     
YES
     
     
     
     
NO
     
     
     
Go to step 16.
16.
EPS control unit check:

EPS control unit check
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Reconnect the steering angle sensor 4P connector (without navigation) or the audio-navigation unit connector D (18P) (with navigation).

?3.
Disconnect the following connector.

?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

     
YES
     
     
     
     
NO
     
     
     
Go to step 17.
17.
ANC/active sound control unit check:

ANC/active sound control unit check
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Reconnect the EPS control unit connector A (11P).

?3.
Disconnect the following connector.

?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

     
YES
     
     
     
     
NO
     
     
     
Go to step 18.
18.
Keyless access control unit check:

Keyless access control unit check
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Reconnect the ANC/active sound control unit 20P connector.

?3.
Disconnect the following connector.

?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

     
YES
     
     
     
     
NO
     
     
     
Go to step 19.
19.
SRS unit check:

SRS unit check
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Reconnect keyless access control unit connector C (24P).

?3.
Disconnect the following connector.

?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS.

Does the HDS identify the vehicle?

     
YES
     
     
     
     
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.?