DTC Troubleshooting: P0641(CVT (TCM))
DTC P0641 : Sensor Reference Voltage 1 Circuit Malfunction
NOTE:
- Before you troubleshoot, review the General Troubleshooting Information .
- This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
| DTC Description | Confirmed DTC | Pending DTC | Freeze Frame |
|---|---|---|---|
| P0641 Sensor Reference Voltage 1 Circuit Malfunction |
DTC(CVT)
- Problem verification
-1. Turn the vehicle to the ON mode.
-2. Clear the DTC with the HDS.
-3. Turn the vehicle to the OFF (LOCK) mode.
-4. Turn the vehicle to the ON mode.
-5. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame P0641 Sensor Reference Voltage 1 Circuit Malfunction Is DTC P0641 indicated?
YES
The failure is duplicated. Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for poor connections and loose terminals between the TCM and the following parts. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.
- CVT drive pulley speed sensor
- CVT driven pulley pressure sensor
- Determine possible failure area (VCC lines, others)
-1. Clear the DTC with the HDS.
-2. Turn the vehicle to the OFF (LOCK) mode.
-3. Disconnect the following connector.
CVT drive pulley speed sensor 3P connector CVT driven pulley pressure sensor 3P connector -4. Turn the vehicle to the ON mode.
-5. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame P0641 Sensor Reference Voltage 1 Circuit Malfunction Is DTC P0641 indicated?
YES
Go to step 4.
NO
Go to step 3.
- Shorted part check:
Check for Pending or Confirmed DTCs with the HDS while reconnecting these parts, one at a time:
- CVT drive pulley speed sensor
- CVT driven pulley pressure sensor
DTC Description Confirmed DTC Pending DTC Freeze Frame P0641 Sensor Reference Voltage 1 Circuit Malfunction Is DTC P0641 indicated?
YES
Replace the part that caused the DTC when it was reconnected.
NO
Check for poor connections and loose terminals at the TCM and the following parts, then go to step 1.
- CVT drive pulley speed sensor
- CVT driven pulley pressure sensor
- Shorted wire check (VCC lines to ground)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. 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.
-3. Disconnect the following connector.
TCM 50P connector -4. Check for continuity between these test points and body ground individually.
Test condition Vehicle OFF (LOCK) mode CVT drive pulley speed sensor 3P connector: disconnected CVT driven pulley pressure sensor 3P connector: disconnected TCM 50P connector: disconnected Connector Terminal TCM 50P connector No. 17 No. 18 Is there continuity?
YES
Repair a short to ground in the VCC wire between the TCM and each part that was disconnected in step 2.
NO
Go to step 5.
- Shorted wire check (VCC lines to power)
-1. Turn the vehicle to the ON mode.
-2. Measure the voltage between these test points and body ground individually.
Test condition Vehicle ON mode CVT drive pulley speed sensor 3P connector: disconnected CVT driven pulley pressure sensor 3P connector: disconnected TCM 50P connector: disconnected Connector Terminal TCM 50P connector No. 17 No. 18 Is there battery voltage?
YES
Repair a short to power in the VCC wire between the TCM and each part that was disconnected in step 2.
NO
The VCC wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the original TCM .