CVT Symptom Troubleshooting - HDS does not communicate with the TCM
HDS does not communicate with the TCM
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshots, and review the General Troubleshooting Information.

1.
CVT system communication check:

CVT system communication check
?1.
Connect the HDS to the DLC.

?2.
Turn the vehicle to the ON mode.

?3.
Check the Mode Menu of the CVT system with the HDS.

Does the HDS show the Mode Menu of the CVT system?

     
YES
     
     
     
The CVT system communication is OK. Intermittent failure, the system is OK at this time.?
     
NO
     
     
     
Go to step 2.
2.
Fuse check:

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

?2.
Check the following fuses.
Fuse
No. A16 (15 A)
Location
Under-hood fuse/relay box

Fuse
No. D17 (10 A)
Location
Under-dash fuse/relay box

Are the fuses OK?

     
YES
     
     
     
The fuses are OK. Reinstall the fuses, then go to step 3.
     
NO
     
     
     
Replace the No. A16 (15 A) fuse and/or the No. D17 (10 A) and recheck. If the fuse(s) blows again, repair a short to ground in the No. A16 (15 A) fuse circuit and/or the No. D17 (10 A) fuse circuit.?
3.
Open wire check (+B line):

Open wire check (+B line)
?1.
Jump the SCS line with the HDS, and wait more than 1 minute.
NOTE: This step must be done to protect the TCM from damage.


?2.
Disconnect the following connector.
TCM 50P connector

?3.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
TCM 50P connector: disconnected
Test point 1
TCM 50P connector No. 1
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The +B wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the +B wire between the under-hood fuse/relay box and the TCM.?
4.
Open wire check (IG1 line):

Open wire check (IG1 line)
?1.
Turn the vehicle to the ON mode.

?2.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
TCM 50P connector: disconnected
Test point 1
TCM 50P connector No. 8
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The IG1 wire is OK. Go to step 5.
     
NO
     
     
     
Repair an open in the IG1 wire between the under-dash fuse/relay box and the TCM.?
5.
Open wire check (GND1 (TCU) line, GND2 (TCU) line):

Open wire check (GND1 (TCU) line, GND2 (TCU) line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
TCM 50P connector: disconnected
Test point 1
TCM 50P connector No. 9
TCM 50P connector No. 10
Test point 2
Body ground

Are there continuity?

     
YES
     
     
     
The GND1 (TCU) wire and the GND2 (TCU) wire are OK. Go to step 6.
     
NO
     
     
     
Repair an open in the GND1 (TCU) wire and/or the GND2 (TCU) wire between the TCM and ground (G151), or repair poor ground (G151).?
6.
Open wire check (F-CAN A_H line, F-CAN A_L line):

Open wire check (F-CAN_H line, F-CAN_L line)
?1.
Check for continuity between test points 1 and 2.
F-CAN A_H wire
Test condition
Vehicle OFF (LOCK) mode
 
TCM 50P connector: disconnected
Test point 1
DLC (16P) (female terminals) No. 6 :
Test point 2
TCM 50P connector No. 3

F-CAN A_L wire
Test condition
Vehicle OFF (LOCK) mode
 
TCM 50P connector: disconnected
Test point 1
DLC (16P) (female terminals) No. 14 :
Test point 2
TCM 50P connector No. 11


Is there continuity?

     
YES
     
     
     
The F-CAN A_H wire and the F-CAN A_L wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the original TCM.?
     
NO
     
     
     
Repair an open in the F-CAN A_H wire and/or the F-CAN A_L wire between the DLC and the TCM.?