P2109 Throttle Pedal Position Sensor Minimum Stop Performance
Component Location
General Description
Using a potentiometer the resistance in accelerator pedal sensor(APS) changes as the accelerator pedal position is different. After the resistance is converted into voltage, the voltage is sent to ETCM. ETCM controls engine power and engine revolution with the voltage from APS. The pedal’s position is calculated from the voltage of potentiometer in the APS. APS is composed of pedal position sensor and two idle switches. Pedal position sensor detects the opening of accelerator pedal and relays voltage signal to ETCM. Two idle switches judge the pedal position sensor failure and let ETCM perform limp home mode. APS value is 0.3V without accelerator pedal depressed but on the other hand APS value is 3.6V with accelerator pedal fully depressed. Even though idle switch fails, if pedal position sensor is normal, engine is operated normally. In case of pedal position sensor failure, idle switch sends signal to ETCM, limp home mode is performed by ETCM to control engine. When both of them are defective, vehicle is driven at idle.
DTC Description (P2109)
If the output voltage of accelerator pedal sensor is below 0.2V for more than 1 second, ETCM judges this as power supply problem of accelerator pedal and DTC is set. The possible cause may be short to ground, open in harness, poor connection of connector. If both of idle switches are normal, engine is controlled in limp home mode and engine speed is fixed at 800 RPM regardless of accelerator pedal position.
| Item | Detecting Condition | Possible Cause | ||
| DTC Strategy | • Voltage monitoring | • Poor connection in connectors • Short to ground • Open in harness |
||
| Enable Conditions |
• Ignition ON or at driving | |||
| Threshold Value |
• Accelerator pedal＜ 0.2V | |||
| Diagnosis Time |
• Above 1 seconds | |||
| Fail Safe | Fuel Cut | No | • Idle mode driving • Engine speed limit (800RPM) |
|
| Fuel Limit | Yes | |||
| MIL | On | |||
Specification
| 1-2 (Non-operating) | 1-2 (Operating) |
| 207.62Ω±20% | 2.5kΩ±20% ->7%±2% |
| 1-3 (Non-operating) | 1-3 (Operating) | 2-3 |
| 2.5kΩ±20% | 614.44Ω±20% | 2.5kΩ±20% ->77.5%±2% |
Diagnostic Circut Diagram
Monitor Scantool Data
1. Connect scantool to Data Link Connector(DLC).
2. Warm up the engine to normal operating temperature.
3. Turn the electrical equipment and air conditioner OFF.
4. Monitor “Start” parameter on the scantool.
Refer to “Accelerator pedal” parameter depending on DTC detecting condition.
Terminal & 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?
| YES | Repair as necessary and then go to “Verification of Vehicle Repair” procedure. |
| NO | Go to “Signal Circuit Inspection” procedure. |
Signal Circuit Inspection
1.Signal Voltage Inspection
(1) Leave the accelerator pedal sensor connector connected.
(2) IG “ON”, and set the start safety switch ON. Leave the engine “OFF”
(3) Measure voltage between terminal 2 of the accelerator pedal sensor harness connector and chassis ground.
Specification :
Approx. 0.3 V (at idle)
Approx. 3.8V (Fully depressed)
(4) Is the voltage measured within specification?
| YES | Go to “Power Circuit Inspection” procedure. |
| NO | Go to “Signal Open Inspection” procedure. |
2.Signal Open Inspection
(1) IG “OFF”, and set the start safety switch ON.
(2) Disconnect the accelerator pedal sensor connector and the ETCM connector.
(3) Measure resistance between terminal 2 of the accelerator pedal sensor harness connector and
terminal 33 of ETCM connector.
Specification: Continuity(Below 1.0 Ω)
(4) Is the resistance measured within specification?
| YES | Go to “Signal Short to Ground Inspection” procedure. |
| NO | Repair open in circuit and then go to “Verification of Vehicle Repair” procedure. |
3.Signal Short to Ground Inspection
(1) IG “OFF”, and set the start safety switch ON.
(2) Disconnect the accelerator pedal sensor connector and the ETCM connector.
(3) Measure resistance between terminal 2 of the accelerator pedal sensor harness connector and chassis ground.
Specification: Infinite
(4) Is the resistance measured within specification?
| YES | Go to “Power circuit Inspection” procedure. |
| NO | Repair short to ground and then go to “Verification of Vehicle Repair” procedure. |
Power Circuit Inspection
1.Power Voltage Inspection
(1) Leave the accelerator pedal sensor connector connected.
(2) IG “ON”, and set the start safety switch ON. Leave the engine “OFF”
(3) Measure voltage between terminal 1 of the accelerator pedal sensor harness connector and chassis ground.
Specification : Approx. 5.0 V
(4) Is the voltage measured within specification?
| YES | Go to “Ground Circuit Inspection” procedure. |
| NO | Go to “Power Open Inspection” procedure. |
2.Power Open Inspection
(1) IG “OFF”, and set the start safety switch ON.
(2) Disconnect the accelerator pedal sensor connector and the ETCM connector.
(3) Measure resistance between terminal 1 of the accelerator pedal sensor harness connector and terminal 34 of ETCM connector.
Specification: Continuity(Below 1.0 Ω)
(4) Is the resistance measured within specification?
| YES | Go to “Short to Ground Inspection” procedure. |
| NO | Repair open in circuit and then go to “Verification of Vehicle Repair” procedure. |
3.Short to Ground Inspection
(1) IG “OFF”, and set the start safety switch ON.
(2) Disconnect the accelerator pedal sensor connector and the ETCM connector.
(3) Measure resistance between terminal 1 of the accelerator pedal sensor harness connector and chassis ground.
Specification: Infinite
(4) Is the resistance measured within specification?
| YES | Go to “Ground Circuit Inspection” procedure. |
| NO | Repair short to ground and then go to “Verification of Vehicle Repair” procedure. |
Ground Circuit Inspection
1.Voltage Drop Inspection
(1) Disconnect the accelerator pedal sensor connector and the ETCM connector.
(2) IG “ON”, and set the start safety switch ON. Leave the engine “OFF”.
(3) Measure voltage drop between terminal 3 of the accelerator pedal sensor harness connector and chassis ground.
Specification: Below 200mV
(4) Is the voltage drop measured within specification?
| YES | Go to “Ground Open Inspection” procedure. |
| NO | Repair poor connection to ground and then go to “Verification of Vehicle Repair” procedure. |
2. Ground Open Inspection
(1) IG “OFF”, and set the start safety switch ON.
(2) Disconnect the accelerator pedal sensor connector and the ETCM connector.
(3) Measure resistance between terminal 3 of the accelerator pedal sensor harness connector and terminal 37 of ETCM connector.
Specification: Continuity(Below 1.0 Ω)
(4) Is the resistance measured within specification?
| YES | Go to “Component Inspection” procedure. |
| NO | Repair open in circuit and then go to “Verification of Vehicle Repair” procedure. |
Component Inspection
1.Accelerator Pedal Sensor Resistance Inspection
(1) IG “OFF”, and set the start safety switch ON.
(2) Disconnect the accelerator pedal sensor connector.
(3) Measure resistance between terminal 1 – 2, 1 – 3, and 2 – 3 of the accelerator pedal sensor connector.
| ②-③(Non-operating) | ②-③(Operating) | ①-②(Non-operating) | ①-②(Operating) | ①-③ |
| 207.62Ω±20% | 2.5kΩ±20% ->7%±2% | 2.5kΩ±20% | 614.44Ω±20% | Approx. 2.5kΩ± 20% ->77.5%±2% |
(4) Is the resistance measured within specification?
| YES | Go to “Verification of Vehicle Repair” procedure. |
| NO | Replace the accelerator pedal sensor and then go to “Verification of Vehicle Repair” procedure. |
Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select “Diagnostic Trouble Codes(DTCs)” mode.
2. Using a scantool, clear the DTC.
3. Operate the vehicle within DTC enable conditions in General Information.
4.Are any DTCs present?
| YES | Go to the applicable DTC procedure. |
| NO | System is performing to specification at this time. |
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