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CVT Symptom Troubleshooting - HDS does not communicate with the TCM
HDS does not communicate with the TCM
NOTE:
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Information marked with an asterisk (*1) applies to the model not equipped with keyless access system, and an asterisk (*2) applies to the model equipped with keyless access system. |
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Information marked with an asterisk (*3) applies to the model not equipped with CAN gateway, and an asterisk (*4) applies to the model equipped with CAN gateway. |
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1. |
CVT system communication check:
CVT system communication check
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?2. |
Turn the vehicle to the ON mode. |
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?3. |
Check the Mode Menu of the CVT system with the HDS. | |
Does the HDS show the Mode Menu of the CVT system?
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The CVT system communication is OK. Intermittent failure, the system is OK at this time.? |
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2. |
Fuse check:
Fuse check
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?1. |
Turn the vehicle to the OFF (LOCK) mode. |
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?2. |
Check the following fuses.
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Fuse |
No. A16 (15 A) |
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Location |
Under-hood fuse/relay box | |
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Fuse |
No. B4 (10 A)*1 |
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No. B17 (10 A)*2 |
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Location |
Under-dash fuse/relay box | |
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Are the fuses OK?
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The fuses are OK. Reinstall the fuses, then go to step 3. |
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Replace the No. A16 (15 A) fuse and/or the No. B4 (10 A) fuse*1/No. B17 (10 A) fuse*2, 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. B4 (10 A) fuse*1/No. B17 (10 A) fuse*2 circuit.? |
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3. |
Open wire check (+B line):
Open wire check (+B line)
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?1. |
Disconnect the following connector.
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?2. |
Measure the voltage between test points 1 and 2.
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Test condition |
Vehicle OFF (LOCK) mode |
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TCM 50P connector: disconnected |
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Test point 1 |
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Test point 2 |
Body ground | |
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Is there battery voltage?
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The +B wire is OK. Go to step 4. |
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Repair an open in the +B wire between the under-hood fuse/relay box and the TCM.? |
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4. |
Open wire check (IG1 line):
Open wire check (IG1 line)
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?1. |
Turn the vehicle to the ON mode. |
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?2. |
Measure the voltage between test points 1 and 2.
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Test condition |
Vehicle ON mode |
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TCM 50P connector: disconnected |
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Test point 1 |
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Test point 2 |
Body ground | |
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Is there battery voltage?
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The IG1 wire is OK. Go to step 5. |
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Repair an open in the IG1 wire between the under-dash fuse/relay box and the TCM.? |
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5. |
Open wire check (GND1(TCU) line, GND2(TCU) line):
Open wire check (GND1(TCU) line, GND2(TCU) line)
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?1. |
Turn the vehicle to the OFF (LOCK) mode. |
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?2. |
Check for continuity between test points 1 and 2.
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Test condition |
Vehicle OFF (LOCK) mode |
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TCM 50P connector: disconnected |
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Test point 1 |
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Test point 2 |
Body ground | |
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Are there continuity?
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The GND1(TCU) wire and the GND2(TCU) wire are OK. Go to step 6. |
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Repair an open in the GND1(TCU) wire and/or the GND2(TCU) wire between the TCM and ground (G201), or repair poor ground (G201).? |
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6. |
Open wire check (F-CAN_H line*3/F-CAN A_H line*4, F-CAN_L line*3/F-CAN A_L line*4):
Open wire check (F-CAN_H line/F-CAN A_H line, F-CAN_L line/F-CAN A_L line)
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?1. |
Check for continuity between test points 1 and 2.
F-CAN_H wire*3/F-CAN A_H wire*4
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Test condition |
Vehicle OFF (LOCK) mode |
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TCM 50P connector: disconnected |
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Test point 1 |
DLC (16P) (female terminals) No. 6:  |
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Test point 2 |
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F-CAN_L wire*3/F-CAN A_L wire*4
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Test condition |
Vehicle OFF (LOCK) mode |
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TCM 50P connector: disconnected |
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Test point 1 |
DLC (16P) (female terminals) No. 14:  |
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Test point 2 |
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Is there continuity?
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The F-CAN_H wire* 3/F-CAN A_H wire* 4 and the F-CAN_L wire* 3/F-CAN A_L wire* 4 are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good TCM, then recheck. If the symptom goes away and the TCM was substituted, replace the original TCM.? |
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Repair an open in the F-CAN_H wire*3/F-CAN A_H wire*4 and/or the F-CAN_L wire*3/F-CAN A_L wire*4 between the DLC and the TCM.? | | 