DTC P0651 (KA/Kc)
DTC P0651: Sensor Reference Voltage B Malfunction
General Description
The powertrain control module (PCM) is equipped with a voltage monitor (5 V power source) to supply a stable 5 V to each sensor as reference voltage. The correct voltage for the sensors are loaded in the CPU of the PCM (A/D input) and when the sensor power voltage is a set value (high or low) for a certain time, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 2.0 seconds or more |
| DTC Type | One drive cycle, MIL on |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
The sensor power voltage is 5.2 V or more, or 4.5 V or less, for at least 2.0 seconds.
Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Accelerator pedal position (APP) sensor VCC line short to power
- A/C pressure sensor VCC line short to power
- Exhaust gas recirculation (EGR) valve VCC line short to power
- CVT driven pulley pressure sensor VCC line short to power* 1
- CVT speed sensor VCC line short to power* 1
- Torque converter turbine speed sensor VCC line short to power* 1
- Neutral position sensor VCC line short to power* 2
- FTP sensor VCC line short to power
- APP sensor VCC line short to ground
- A/C pressure sensor VCC line short to ground
- EGR valve VCC line short to ground
- CVT driven pulley pressure sensor VCC line short to ground* 1
- CVT speed sensor VCC line short to ground* 1
- Torque converter turbine speed sensor VCC line short to ground* 1
- Neutral position sensor VCC line short to ground* 2
- FTP sensor VCC line short to ground
- PCM internal circuit failure
*1: CVT model
*2: M/T model
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.