[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
13 -FUEL > 13A-DIRECT INJECTION AND MULTIPOINT FUEL INJECTION (DI AND MPI) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > CODE NO. P0638 THROTTLE VALVE CONTROL SERVO CIRCUIT RANGE/PERFORMANCE PROBLEM
Code No. P0638: Throttle Valve Control Servo Circuit Range/Performance Problem
 
 
 
 
OPERATION
  • Check code No. P2101: Throttle valve control servo magneto malfunction (Refer to ).
 
 
FUNCTION
  • Engine-ECU checks the electronic controlled throttle system for abnormal conditions.
 
 
TROUBLE JUDGEMENT
Check Conditions
  • Ignition switch is "ON" position.
  • Battery positive voltage is more than 8.3 V.
Judgement Criterion
  • The drive current of the throttle valve control servo is not normal.
or
  • The temperature in the drive circuit of the throttle valve control servo is not normal.
Check Conditions
  • Ignition switch is "ON" position.
  • The throttle position sensor is normal.
Judgement Criterion
  • Throttle position sensor (main) mid opening learning value is more than 4.0 V.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Throttle opening degree position is in default position.
 
 
PROBABLE CAUSES
  • Failed throttle valve return spring.
  • Failed throttle valve operation.
  • Failed throttle valve control servo.
  • Harness damage in throttle valve control servo circuit or loose connector contact.
  • Failed engine-ECU.

 
 
DIAGNOSIS PROCEDURE
STEP 1. Check throttle body.
  • Check whether the throttle valve return spring is normal.
Is the check result normal?
Go to Step 2.
Replace the throttle body assembly.
 
STEP 2. Check throttle valve control servo itself.
  • Throttle valve control servo check (Refer to ).
Is the check result normal?
Go to Step 3.
Replace the throttle body assembly.
 
STEP 3. Check of damage in ETV- line between electronic-controlled throttle valve connector and engine-ECU connector.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Check of damage in ETV+ line between electronic-controlled throttle valve connector and engine-ECU connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. M.U.T.-IIISE diagnosis code
  • Reconfirmation of diagnosis code.
Is the diagnosis code set?
Replace engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).