DTC 17

Throttle Position Sensor System Circuit:

Connectors:

CIRCUIT OPERATION
The throttle position sensor signal is sent to the auto-cruise control-ECU through this circuit. The auto-cruise control-ECU receives a signal from the throttle position sensor at terminal 1. The signal is OFF when the accelerator pedal is depressed, and ON when the accelerator pedal is released. The throttle position sensor sends a voltage signal to terminal 1 of the auto-cruise control-ECU. The voltage depends on throttle opening angle.

DTC SET CONDITIONS
If 2.5 volts or more 0.2 volts or less is output for four seconds or more.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:
- Malfunction of the throttle position sensor.
- Damaged harness or connector.
- Malfunction of the auto-cruise control-ECU.

DIAGNOSIS

Required Special Tools:
- MB991502: Scan Tool (MUT-II)
- MB991223: Harness Set




STEP 1. Check the throttle position sensor.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Using scan tool MB991502.
2. Connect scan tool MB991502 to the data link connector.
3. Turn the ignition switch to the "ON" position.
4. Read the MFI-DTC.
5. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the MFI-DTC P0121, P0122 or P0123 is output?

YES: Refer to Diagnosis - Diagnostic Trouble Code Chart.

NO: Go to Step 2.

STEP 2. Check the output circuit voltage at auto-cruise control-ECU connector C-107 by backprobing.
1. Do not disconnect auto-cruise control-ECU connector C-107.
2. Turn the ignition switch to the "ON" position and the auto-cruise control main switch to the "ON" position.




3. Measure the voltage between terminal 1 and ground by backprobing.
- Voltage should be between 4.0 and 5.5 volts. (When accelerator pedal is fully depressed.)]
- Voltage should be between 0.4 and 1.0 volts. (When accelerator pedal is released.)

4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Are the voltage within specifications?

YES: Check that diagnostic trouble code 17 is not output. If diagnostic trouble code 17 is output, replace the auto-cruise control-ECU. Then check that diagnostic trouble code 17 is not.

NO: Go to Step 3.




STEP 3. Check auto-cruise control-ECU connector C-107.

Q: Is the connector damaged?

YES: Repair or replace connector. Refer to Harness Connector Inspection. Then check that diagnostic trouble code 17 is not output.

NO: Go to Step 4.







STEP 4. Check the harness wire between throttle position sensor connector B-03 and auto-cruise control-ECU connector C-107.

Q: Is the harness wire between throttle position sensor connector B-03 and auto-cruise control-ECU connector C-107 damaged?

YES: Repair harness wire and then check that diagnostic trouble code 17 is not output.

NO: Check that diagnostic trouble code 17 is not output. If diagnostic trouble code 17 is output, replace the auto-cruise control-ECU. Then check that diagnostic trouble code 17 is not output.