DTC P0122 Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input |
DTC P0123 Throttle / Pedal Position Sensor / Switch "A" Circuit High Input |
for Preparation Click here
DESCRIPTION
The throttle position sensor is mounted on the diesel throttle body and detects the opening angle of the throttle valve. This sensor is an electronic sensor and uses Hall-effect elements.When the throttle valve is fully closed, a voltage of approximately 0.7 V is applied to terminal VLU of the ECM. The voltage applied to terminal VLU of the ECM increases in proportion to the opening angle of the throttle valve and becomes approximately 3.5 to 4.0 V when the throttle valve is fully opened.
The data is used for EGR control, etc.
DTC Detection Drive Pattern | DTC Detection Condition | Trouble Area |
Ignition switch ON for 3 seconds | Throttle position sensor output (VLU) is below 0.2 V for 3 seconds. (1 trip detection logic) |
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DTC Detection Drive Pattern | DTC Detection Condition | Trouble Area |
Ignition switch ON for 3 seconds | Throttle position sensor output (VLU) is higher than 4.8 V for 3 seconds. (1 trip detection logic) |
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DTC No. | Data List |
P0122 | Throttle Sensor Volt % |
P0123 |
- HINT:
- Throttle Sensor Volt %: Throttle position sensor output voltage is converted using 5 V = 100%.
- When fully closed: 14% or less.
- When fully open: 70% or more.
- When the ignition switch is turned from off to ON, the throttle valve fully opens once.
- When the ignition switch is turned from ON to off, the throttle valve fully closes once.
- If DTC P0122 and/or P0123 is stored, the following symptoms may appear:
- Intake booming noise
- Black smoke
- Lack of power
- Vibration at engine stop
- Turbo overspeed, turbo damage
MONITOR DESCRIPTION
When the output voltage of the throttle position sensor deviates from the normal operating range (between 0.2 V and 4.8 V) for more than 3 seconds, the ECM interprets this as a malfunction of the sensor circuit and illuminates the MIL.WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).
- HINT:
- Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
1.CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM) |
Disconnect the diesel throttle body assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition B107-5 (VC) - B32-97 (VCVL) Always Below 1 Ω B107-6 (VTA) - B32-119 (VLU) Always Below 1 Ω B107-3 (E2) - B32-96 (EVLU) Always Below 1 Ω
- Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition B107-5 (VC) or B32-97 (VCVL) - Body ground Always 10 kΩ or higher B107-6 (VTA) or B32-119 (VLU) - Body ground Always 10 kΩ or higher B107-3 (E2) or B32-96 (EVLU) - Body ground Always 10 kΩ or higher
Text in Illustration *1 Front view of wire harness connector
(to Throttle Body)*2 Front view of wire harness connector
(to ECM)
Reconnect the diesel throttle body assembly connector.
Reconnect the ECM connector.
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OK | |
2.CHECK ECM TERMINAL VOLTAGE (VC TERMINAL) |
Disconnect the diesel throttle body assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Switch Condition Specified Condition B107-5 (VC) - B7-3 (E2) Ignition switch ON 4.98 to 5.02 V
Text in Illustration *1 Front view of wire harness connector
(to Throttle Body)
Reconnect the diesel throttle body assembly connector.
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OK | |
3.REPLACE DIESEL THROTTLE BODY ASSEMBLY |
Replace the diesel throttle body assembly (Click here).
NEXT | |
4.CHECK WHETHER DTC OUTPUT RECURS |
Connect the intelligent tester to the DLC3.
Clear the DTCs (Click here).
Turn the ignition switch off for 30 seconds or more.
Turn the ignition switch to ON for 3 seconds.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the DTCs.
Result Result Proceed to P0122 or P0123 A No output B
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A | |
5.REPLACE ECM |
Replace the ECM (Click here).
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6.REPAIR OR REPLACE HARNESS OR CONNECTOR |
Repair or replace the harness or connector.
NEXT | |
7.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
Connect the intelligent tester to the DLC3.
Clear the DTCs (Click here).
Turn the ignition switch off for 30 seconds or more.
Turn the ignition switch to ON for 3 seconds.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Confirm that the DTC is not output again.
NEXT | ||
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