1. DTC P0651 description
The ECM supplies 5 V power to the following sensors via 5 V reference circuit 2.
- Accelerator pedal position sensor 2
The ECM also supplies 5 V power to the following sensors through 5 V reference circuit 8.
- FRP sensor
- CMP sensor
- Exhaust gas temperature sensor 2 (Front of oxidation catalyst)
5 V reference circuits 2 and 8 are independent of each other outside the ECM but share the bus inside the ECM. Therefore, whole 5 V reference circuits 2 and 8 may be affected by a short circuit in one of the sensor 5 V reference circuits. The ECM monitors the voltage of 5 V reference circuits 2 and 8, and if it detects that the voltage is excessively low or high, the DTC is set.
2. Condition for setting DTC P0651
Condition for running the DTC
- The battery voltage is 9 to 16 V.
- The ignition switch is ON.
Condition for setting the DTC
- The ECM detects that the voltage of 5 V reference circuit 2 or 8 is 4.5 V or less, or 5.5 V or more.
3. Action taken when DTC P0651 sets
- The ECM illuminates the MIL. Refer to Action taken when DTC sets - Type A.
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".
- The ECM limits the fuel injection quantity.
- The ECM inhibits engine startup.
- The ECM inhibits pre-injection.
- The ECM inhibits the EGR control.
- The ECM inhibits the cruise control.
- The ECM assumes a default Exhaust gas temperature sensor 2 (front of oxidation catalyst) value.
- The ECM assumes a default FRP sensor value.
4. Condition for clearing DTC P0651
- Refer to Conditions for clearing the MIL/DTC - Type A or Type B.
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".