DTC P0638
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
P0638: Throttle Actuator Control Range / Performance Inlet throttle valve internal failure. (1 D/C detection logic) |
•Inlet throttle valve and/or its circuit
•ECM |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | B1: | Inlet throttle valve position sensor power supply circuit | 1. | ECM |
| A1: | Inlet throttle valve (+) drive circuit | B2: | Inlet throttle valve position sensor signal circuit | 2. | Inlet throttle valve motor |
| A2: | Inlet throttle valve (–) drive circuit | B3: | Inlet throttle valve position sensor ground circuit | 3. | Inlet throttle valve position sensor |
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
Inlet throttle valve (+) drive circuit and (–) drive circuit check
1)Check “A1” and “A2” circuits according to Step 2 of Inlet Throttle Valve Operation Check:D16AA.
Is check result OK?
|
Go to Step 3.
|
Repair or replace defective wire harness.
|
| 3 |
Inlet throttle valve check
1)Check inlet throttle valve.
Is check result OK?
|
Replace ECM and recheck inlet throttle valve operation.
|
Replace inlet throttle valve.
|