[ 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. P0123 THROTTLE POSITION SENSOR (MAIN) CIRCUIT HIGH INPUT
Code No. P0123: Throttle Position Sensor (main) Circuit High Input
 
 
 
 
OPERATION
  • A power voltage of 5 V is applied to the electronic-controlled throttle valve from the engine-ECU connector terminal TPS5.
  • The power voltage is earthed to the engine-ECU connector terminal TPSE from the electronic-controlled throttle valve.
  • The sensor signal is inputted to the engine-ECU connector terminal TPSM from the electronic-controlled throttle valve output terminal.
 
 
FUNCTION
  • The throttle position sensor converts the throttle valve position into voltage and inputs it into the engine-ECU.
  • The engine-ECU controls the throttle valve opening angle.
 
 
TROUBLE JUDGEMENT
Check Condition
  • Ignition switch is "ON" position.
Judgement Criterion
  • Throttle position sensor (main) output voltage is more than 4.8 V.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if throttle position sensor (sub) fails.
 
 
PROBABLE CAUSES
  • Failed throttle position sensor (main)
  • Open/short circuit or harness damage in throttle position sensor (main) circuit or loose connector contact
  • Failed engine-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE data list
  • Data list reference table (Refer to ).
    1. Item 13: Throttle position sensor (main)
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2.
 
STEP 2. Perform voltage measurement at electronic-controlled throttle valve connector.
  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal engine-ECU TPS5 line and body earth.
OK: 4.9 - 5.1 V
Is the check result normal?
Go to Step 5.
Go to Step 3.
 
STEP 3. Check of short to earth, and open circuit in TPS5 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. M.U.T.-IIISE data list
  • Data list reference table (Refer to ).
    1. Item 13: Throttle position sensor (main)
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU.
 
STEP 5. Perform resistance measurement at electronic-controlled throttle valve connector.
  • Disconnect connector, and measure at harness side.
  • Resistance between terminal engine-ECU TPSE line and body earth.
OK: Continuity (2 Ω or less)
Is the check result normal?
Go to Step 7.
Go to Step 6.
 
STEP 6. Check of open circuit, and damage in TPSE 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 7. Check of damage in TPS5 line between electronic-controlled throttle valve connector and engine-ECU connector.
Is the check result normal?
Go to Step 8.
Repair the connector(s) or wiring harness.
 
STEP 8. Check of open circuit, and damage in TPSM line between electronic-controlled throttle valve connector and engine-ECU connector.
Is the check result normal?
Go to Step 9.
Repair the connector(s) or wiring harness.
 
STEP 9. M.U.T.-IIISE data list
  • Data list reference table (Refer to ).
    1. Item 13: Throttle position sensor (main)
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 10.
 
STEP 10. Replace the electronic-controlled throttle valve
  • After replacing the electronic-controlled throttle valve, reconfirm whether the diagnosis code is set.
Is the diagnosis code set?
Replace the engine-ECU.
Check end.