DTC P0638 Throttle Actuator Control Range/Performance (4JJ3 without DPD)

1. DTC P0638 description

The ECM controls the opening position of the intake throttle valve based on the driving condition of the engine by controlling the intake throttle motor. The intake throttle valve opening position is detected by the position sensor, and is sent to the ECM. If the ECM detects the difference between the actual intake throttle valve position and the desired intake throttle valve position while the intake throttle motor is commanded ON, the DTC is set.

2. Condition for setting DTC P0638

Condition for running the DTC

The battery voltage is 9 to 16 V.
The ignition switch is ON.
The desired intake throttle valve opening position is stable.
The intake throttle motor is commanded ON.
DTCs P0122, P0123, P060B, and P0697 are not set.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P0122 Throttle Position Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P0123 Throttle Position Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P060B Internal Control Module A/D Processing Performance".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P0697 Sensor Reference Voltage 3 Circuit".

Condition for setting the DTC

The ECM detects that the difference between the actual intake throttle valve opening position and the desired valve opening position is 10% or more for 5 seconds.

3. Action taken when DTC P0638 sets

Euro4: The ECM illuminates the MIL. Refer to Action taken when DTC sets - Type A (Euro4).
Except Euro4: The ECM illuminates the check engine warning light. Refer to Action taken when DTC sets - Type A (Except Euro4).

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC type definitions".

The ECM inhibits the EGR control.
The ECM inhibits the cruise control.

4. Condition for clearing DTC P0638

Euro4: Refer to Condition for clearing the MIL/DTC - Type A or Type B (Euro4).
Except Euro4: Refer to Condition for clearing the check engine warning light/DTC - Type A or Type B (Except Euro4).

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC type definitions".