[ 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. P0657 THROTTLE VALVE CONTROL SERVO RELAY CIRCUIT MALFUNCTION
Code No. P0657: Throttle Valve Control Servo Relay Circuit Malfunction
 
 
 
 
OPERATION
  • Battery voltage is applied to the throttle valve control servo relay from the engine control relay.
  • Engine-ECU connector terminal C/RL applies current to the throttle valve control servo relay coil by turning ON the power transistor in the unit in order to turn the relay ON.
  • When the throttle valve control servo relay turns ON, battery voltage is supplied by the throttle valve control servo relay to the engine-ECU connector terminal RSB.
 
 
FUNCTION
  • When the ignition switch ON signal is input into the engine-ECU, the engine-ECU turns ON the throttle valve control servo.
 
 
TROUBLE JUDGEMENT
Check Condition
  • Battery positive voltage is more than 8.3 V.
Judgement Criterion
  • The power line voltage of the electronic-controlled throttle system is less than 6.0 V.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Throttle opening degree position is in default position.
 
 
PROBABLE CAUSES
  • Failed throttle valve control servo relay
  • Open/short circuit or harness damage in throttle valve control servo relay circuit or loose connector contact.
  • Failed engine-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. Check throttle valve control servo relay itself.
  • Throttle valve control servo relay check (Refer to ).
Is the check result normal?
Go to Step 2.
Replace the throttle valve control servo relay.
 
STEP 2. Perform voltage measurement at throttle valve control servo relay connector.
  • Remove relay, and measure at relay box side.
  • Ignition switch: ON
  • Voltage between terminal relay switch side power supply line and body earth.
OK: System voltage
Is the check result normal?
Go to Step 3.
Repair the connector(s), or check and repair of open circuit, and short circuit in throttle valve control servo relay switch side power supply line between engine control relay connector and throttle valve control servo relay connector.
 
STEP 3. Perform voltage measurement at throttle valve control servo relay connector.
  • Remove relay, and measure at relay box side.
  • Ignition switch: ON
  • Voltage between terminal relay coil side power supply line and body earth.
OK: System voltage
Is the check result normal?
Go to Step 4.
Repair the connector(s), or check and repair of open circuit, and short circuit in throttle valve control servo relay coil side power supply line between engine control relay connector and throttle valve control servo relay connector.
 
STEP 4. Perform voltage measurement at engine-ECU connector.
  • Disconnect connector, and measure at harness side.
  • Short-circuit engine-ECU connector the terminal C/R to the body earth.
  • Voltage between terminal C/RL and body earth.
OK: System voltage
Is the check result normal?
Go to Step 5.
Repair the connector(s), or check and repair of open circuit, and short circuit in C/RL line between throttle valve control servo relay connector and engine-ECU connector.
 
STEP 5. Perform voltage measurement at engine-ECU connector.
  • Disconnect connector, and measure at harness side.
  • Short-circuit engine-ECU connector terminals C/R and C/RL to the body earth.
  • Voltage between terminal RSB and body earth.
OK: System voltage
Is the check result normal?
Go to Step 8.
Go to Step 6.
 
STEP 6. Check of open circuit, and short circuit in RSB line between throttle valve control servo relay connector and engine-ECU connector.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
 
STEP 7. Check of damage in throttle valve control servo relay coil side power supply line between engine control relay connector and throttle valve control servo relay connector.
Is the check result normal?
Repair the connector(s), or check and repair of damage in C/RL line between throttle valve control servo relay connector and engine-ECU connector.
Repair the connector(s) or wiring harness.
 
STEP 8. Check of damage in throttle valve control servo relay switch side power supply line between engine control relay connector and throttle valve control servo relay connector.
Is the check result normal?
Go to Step 9.
Repair the connector(s) or wiring harness.
 
STEP 9. Check of damage in RSB line between throttle valve control servo relay connector and engine-ECU connector.
Is the check result normal?
Go to Step 10.
Repair the connector(s) or wiring harness.
 
STEP 10. M.U.T.-IIISE diagnosis code
  • Reconfirmation of diagnosis code.
Is the diagnosis code set?
Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).