COMPONENT LOCATION
GENERAL DESCRIPTION

The Throttle Position Sensor (TPS) is mounted on the throttle body and detects the opening angle of the throttle plate. The TPS has a variable resistor (potentiometer) whose characteristic is the resistance changing according to the throttle angle. During acceleration, the TPS resistance between the reference 5V and the signal terminal decreases and output voltage increases; during deceleration, the TPS resistance increases and TPS output voltage decreases. The PCM supplies a reference 5V to the TPS and the output voltage increases directly with the opening of the throttle valve. The PCM determines operating conditions such as idle (closed throttle), part load, acceleration/deceleration, and wide-open throttle from the TPS. Also The PCM uses the Mass Air Flow Sensor (MAFS) signal along with the TPS signal to adjust fuel injection duration and ignition timing.

DTC DESCRIPTION

ECM sets DTC P0123 if the ECM detects signal voltage higher than the possible range of a properly operating TPS

DTC DETECTING CONDITION

Item

Detecting Condition

Possible Cause

DTC Strategy

●

Voltage range check

●

Open in signal or ground circuit

●

Short to battery in signal circuit

●

Contact resistance in connectors

●

Faulty TP sensor

Enable Conditions

●

6 ＜ Battery voltage ＜ 16V

Threshold Value

●

Voltage ＞ 4.86 V

Diagnostic Time

●

1 sec.

MIL On Condition

●

2 Driving Cycles

SIGNAL WAVEFORM AND DATA

Test Condition

Scan Tool Parameter

Scan Tool Screen

TPS VOLTAGE

Normal value with ignition "ON" ＆ engine "OFF"

Accelerator pedal released

0.20~0.47V

Fig.1

Normal value with engine ON ＆ accelerator pedal fully depressed

4.2~4.7V

-

Abnormal value with ignition "ON" ＆ engine "OFF"

Power circuit open

0.01V

Fig. 2

Ground circuit open

4.99V

Fig. 3

TPS signal circuit open

4.99V

Fig. 4

TPS signal circuit short to ground

Approx. 0V

-

TPS signal circuit short to battery

Above 4.99V

-

SPECIFICATION

Closed throttle status

Wide open throttle

Throttle opening angle(˚)

0 ~ 0.5°

Approx. 86 ˚

Voltage (V)

0.25 ~ 0.9 V

Min. 4.0V

Resistance (㏀)

Terminal 1 ＆ 2

0.71 ~ 1.38㏀

2.7㏀

Terminal 2 ＆ 3

1.6 ~ 2.4㏀

SCHEMATIC DIAGRAM
MONITOR DTC STATUS
note

If any DTCs relating to TPS are stored, do ALL REPAIRS associated with those codes before proceeding with further troubleshooting

1.

Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.

2.

Press F4(DTAL) to select DTC information from the DTCs menu.

3.

Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.

4.

Read "DTC Status" parameter.

5.

Is parameter displayed "History(Not Present) fault"?

note
-

History (Not Present) fault : DTC occurred but has been cleared.

-

Present fault : DTC is occurring at present time.

▶ Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

▶ Go to next step as below.

GROUND CIRCUIT INSPECTION
note

Check for open or short circuit in harness. Refer to "Signal Waveform ＆ Data" in the "General Information" procedure

1.

Ignition "OFF"

2.

Disconnect TPS connector

3.

Measure resistance between terminal 2 of the sensor harness connector and chassis ground

Specification : Approx. 0Ω

4.

Is resistance within the specification?

▶ Go to next step as below

▶ Check the ground circuit for an open.

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure

SIGNAL CIRCUIT INSPECTION
note

Check for open or short circuit in harness. Refer to "Signal Waveform ＆ Data" in the "General Information" procedure

1.

Check for short to battery in signal circuit

(1)

Disconnect ECM connector

(2)

Ignition "ON" ＆ Engine "OFF"

(3)

Measure voltage between terminal 1 of the sensor harness connector and chassis ground

Specification : Approx. 0V

(4)

Is voltage within the specification?

▶ Go to next step as below

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure

2.

Check for open in signal circuit

(1)

Ignition "OFF"

(2)

Measure resistance between terminals 1 of the sensor harness connector and 41 of the ECM harness connector

Specification : Approx. 0Ω

(3)

Is resistance within the specification?

▶ Go to next step as below

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure

TERMINAL AND CONNECTOR INSPECTION
1.

Many malfunctions in the electrical system are caused by poor harness(es) 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?

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure

▶ Go to next step as below

COMPONENT INSPECTION
1.

Ignition "OFF"

2.

Disconnect TPS connector

3.

Measure resistance between terminals 2 and 3 of the TPS connector(Component side)

Specification : Approx. 1.6 ~ 2.4 ㏀ at all throttle position

4.

With still TPS connector disconnected, measure resistance between terminals 1 and 2 of the sensor connector(Component side)

5.

Operate the throttle valve slowly from the idle position to the full open position and check the resistance changes smoothly in proportion with the throttle valve opening angle.

Specification : 0.71 ~ 1.38 ㏀ at closed throttle valve, 2.7 ㏀ at wide open throttle

6.

Is resistance within the specification?

▶ Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure

▶ Check TPS for contamination, deterioration, or damage. Substitute with a known-good TPS and check for proper operation. If the problem is corrected, replace TPS 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 scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.

2.

Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". 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"?

▶ System performing to specification at this time. Clear the DTC

▶ Go to the applicable troubleshooting procedure.

Яндекс.Метрика