OPERATION
- Battery voltage is applied to the Throttle valve control servo relay terminal (terminal No. 4).
- Battery voltage is applied to the Throttle valve control servo relay terminal (terminal No. 3) from the engine control relay (terminal No. 1).
- Engine-A/T-ECU (terminal No. 15) 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 (terminal No. 1) to the engine-A/T-ECU (terminal No. 132).
FUNCTION
- When the ignition switch ON signal is input into the engine-A/T-ECU, the engine-A/T-ECU turns ON the Throttle valve control servo.
TROUBLE JUDGMENT
Check Condition
- Ignition switch is in "ON" position.
Judgement Criterion
- The power line voltage of the electronic controlled throttle system is 4.0 V or less for 1 second.
PROBALE CAUSE
- Failed throttle valve return spring
- Open/short circuit in throttle valve control servo circuit or loose connector contact.
- Failed engine-A/T-ECU
)
Q: Is the check result normal?
YES:
Go to Step 2 
.NO: Repair.
- Remove relay, and measure at relay box side.
- Voltage between terminal No. 4 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 4 .NO:
- Check intermediate connector A-14, and repair if necessary. If intermediate connector is normal, check and repair harness between B-14X (terminal No. 4) throttle valve control servo relay connector and battery.
- Check power supply line for open/short circuit.
- Remove relay, and measure at relay box side.
- Ignition switch: ON
- Voltage between terminal No. 3 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 5 .NO: Go to Step 6
.)
Q: Is the check result normal?
YES:
- Check intermediate connector C-17, and repair if necessary. If intermediate connector is normal, check and repair harness between B-17X (terminal No. 1) engine control relay connector and B-14X (terminal No. 3) throttle valve control servo relay connector.
- Check power supply line for open/short circuit.
)
- Disconnect connector, and measure at harness side.
- Ignition switch: ON
- Voltage between terminal No. 15 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
- Check and repair harness between B-14X (terminal No. 2) throttle valve control servo relay connector and C-134 (terminal No. 15) engine-A/T-ECU connector.
- Check earthing line for open/short circuit.
.)
- Disconnect connector, and measure at harness side.
- Ignition switch: ON
- Voltage between terminal No. 132 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 10 .NO: Go to Step 8
.
- Check output line for open/short circuit.
Q: Is the check result normal?
YES:
Go to Step 9 .NO: Repair.
NOTE: Before checking harness, check intermediate connector C-17, and repair if necessary.
- Check output line for damage.
Q: Is the check result normal?
YES:
- Check and repair harness between B-14X (terminal No. 2) throttle valve control servo relay connector and C-134 (terminal No. 15) engine-A/T-ECU connector.
- Check earthing line for open/short circuit.
)
Q: Is the check result normal?
YES:
Go to Step 11 .NO: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points
).
- Check power supply line for damage.
Q: Is the harness connector in good condition?
YES:
Go to Step 12 .NO: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points
).
- Check power supply line for damage.
Q: Is the harness connector in good condition?
YES:
Go to Step 13 .NO: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points
).