DTC P0638 (Flash Code 61) Throttle Actuator Control Range/Performance (RZ4E-TC)

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 voltage is 9 to 16 V.
The ignition switch is ON.
The intake throttle valve opening position is constant.
The intake throttle motor duty ratio is the predetermined value or more.
The intake throttle valve 0-point learning is not in progress.
DTCs P0122, P0123, P02E3, P060B, and P1655 are not set.

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0122 (Flash Code 43) Throttle Position Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0123 (Flash Code 43) Throttle Position Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P02E3 (Flash Code 43) Intake Air Flow (IAF) Valve Control Circuit High Voltage".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P060B (Flash Code 36) Internal Control Module A/D Processing Performance".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P1655 (Flash Code 59) Sensor Reference Voltage 4 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 the predetermined value or more for 5.1 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(RZ4E-TC) DTC type definitions".

The ECM inhibits pre-injection.
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(RZ4E-TC) DTC type definitions".