DTC 17

DTC 17: Throttle Position Sensor System

Throttle Position Sensor System Circuit Part 1:

Throttle Position Sensor System Circuit Part 2:

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 3. 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 P0120 is output?

YES: For 2.4L engine, refer to Diagnosis - Diagnostic Trouble Code Chart. For 3.0L engine, 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-20 (terminal number 1) by backprobing.

1. Do not disconnect auto-cruise control-ECU connector C-20.
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 output.

NO: Go to Step 3.




STEP 3. Check auto-cruise control-ECU connector C-20.

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-07 (terminal number 3) and auto-cruise control-ECU connector C-20 (terminal number 1).

Q: Is the harness wire between throttle position sensor connector B-07 (terminal number 3) and auto-cruise control-ECU connector C-20 (terminal number 1) 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.