Fuel System

General Description

The ECM provides a 5 volt reference voltage to Throttle Position Sensor 1(TPS1). The ECM monitors reference voltage deviation from the power supply circuit of the sensors.

DTC Description

Checking the voltage from sensor power supply every 1.87 sec. under detecting condition, if the value within detecting condition lasts for more than 0.2 sec., ECM sets P0641. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

DTC Detecting Condition






Diagnostic Circuit Diagram






Monitor GDS Data

1. Connect GDS to Data Link Connector(DLC).
2. IG "ON".
3. Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.
4. Read "DTC Status" parameter.






5. Is parameter displayed "Present fault"?






Terminal and Connector inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Power Circuit Inspection

Check voltage
1. IG "OFF" and disconnect ETC Motor & TPS connector.
2. IG "ON"
3. Measure voltage between TPS power terminal of ETC Motor & TPS harness connector and chassis ground.

Specification :Approx. 5V

4. Is the measured voltage within specification ?






Check short in power harness
1. IG "OFF" and disconnect ETC Motor & TPS connector and ECM connector.
2. Measure the resistance between TPS power and ETC motor (+) terminals of ETC Motor & TPS harness connector.(Measurement "A")
3. Measure the resistance between TPS power and ETC motor (-) terminals of ETC Motor & TPS harness connector.(Measurement "A")
4. Measure the resistance between TPS power and TPS ground terminals of ETC Motor & TPS harness connector.(Measurement "B")

Specification :Infinite

5. Is the measured resistance within specification ?






Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect GDS and select "DTC" button.
2. Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History(Not Present) fault"?