DTC Troubleshooting: P0651
DTC P0651: Sensor Reference Voltage B Malfunction
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0651 Sensor Reference Voltage B Malfunction
      

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0651 Sensor Reference Voltage B Malfunction
      

Is DTC P0651 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the PCM and these 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.?
APP sensor
Throttle body
CVT speed sensor
CVT driven pulley pressure sensor
Torque converter turbine speed sensor
2.
Determine possible failure area (VCC lines, others):

Determine possible failure area (VCC lines, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
APP sensor 6P connector
Throttle body 6P connector
CVT speed sensor 3P connector
CVT driven pulley pressure sensor 3P connector
Torque converter turbine speed sensor 3P connector

?3.
Turn the vehicle to the ON mode.

?4.
Clear the DTC with the HDS.


?5.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0651 Sensor Reference Voltage B Malfunction
      

Is DTC P0651 indicated?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Go to step 3.
3.
Shorted part check:

Shorted part check
?1.
Check for Pending or Confirmed DTCs with the HDS while reconnecting these parts, one at a time:
APP sensor
Throttle body
CVT speed sensor
CVT driven pulley pressure sensor
Torque converter turbine speed sensor

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0651 Sensor Reference Voltage B Malfunction
      

Is DTC P0651 indicated?

     
YES
     
     
     
Replace the part that caused the DTC when it was reconnected.?
     
NO
     
     
     
Check for poor connections or loose terminals at the PCM and the following parts, then go to step 1.
APP sensor
Throttle body
CVT speed sensor
CVT driven pulley pressure sensor
Torque converter turbine speed sensor
4.
Shorted wire check (VCC lines):

Shorted wire check (VCC lines)
?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 connectors.
PCM connector A (51P)
PCM connector B (51P)
PCM connector C (51P)

?4.
Check for continuity between these test points and body ground individually.
Test condition
Vehicle OFF (LOCK) mode
APP sensor 6P connector: disconnected
Throttle body 6P connector: disconnected
CVT speed sensor 3P connector: disconnected
CVT driven pulley pressure sensor 3P connector: disconnected
Torque converter turbine speed sensor 3P connector: disconnected
PCM connector A (51P): disconnected
PCM connector B (51P): disconnected
PCM connector C (51P): disconnected

Connector
Terminal
PCM connector A (51P)
No. 40
PCM connector B (51P)
No. 48
PCM connector C (51P)
No. 30

Is there continuity?

     
YES
     
     
     
Repair a short in the VCC wire between the PCM (A40, B48, or C30) and each part that was disconnected in step 2.?
     
NO
     
     
     
The VCC wires are OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0651 goes away and the PCM was updated, troubleshooting is complete. If DTC P0651 goes away and the PCM was substituted, replace the original PCM.?