DTC P0641 Sensor Reference Voltage 1 Circuit (4JJ3 with DPD)

1. DTC P0641 description

The ECM supplies 5 V power to the following sensors via 5 V reference circuit 1.

Accelerator pedal position sensor 1

The ECM supplies 5 V power to the following sensors via 5 V reference circuit 7.

CKP sensor

5 V reference circuit 1 and 7 are independent of each other outside the ECM but share the bus inside the ECM. Therefore, whole 5 V reference circuits 1 and 7 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 1 and 7, and if it detects that the voltage is excessively low or high, the DTC is set.

2. Condition for setting DTC P0641

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 1 or 7 is 4.5 V or less, or 5.5 V or more.

3. Action taken when DTC P0641 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 inhibits the cruise control.

4. Condition for clearing DTC P0641

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".