DTC Code | DTC Name |
---|---|
P0122 | Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input |
P0123 | Throttle / Pedal Position Sensor / Switch "A" Circuit High Input |
DESCRIPTION
The throttle position sensor is mounted on the diesel throttle body assembly 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 0.4 to 1.0 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 3.6 to 4.2 V when the throttle valve is fully opened.
The ECM determines the vehicle driving conditions from the signals input to its VLU terminal. The data is one of the pieces of information used for EGR control, etc.
*1 | Magnet |
*2 | Hall IC |
*3 | Throttle Position Sensor |
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
---|---|---|---|---|---|
P0122 | Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input | Throttle position sensor output (VLU) is below 0.2 V for 3 seconds (1 trip detection logic). |
|
Comes on | DTC stored |
P0123 | Throttle / Pedal Position Sensor / Switch "A" Circuit High Input | Throttle position sensor output (VLU) is higher than 4.8 V for 3 seconds (1 trip detection logic). |
|
Comes on | DTC stored |
Tech Tips
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
CONFIRMATION DRIVING PATTERN
DTC No. | DTC Detection Drive Pattern |
---|---|
P0122 P0123 |
Ignition switch ON for 3 seconds or more |
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
*a | Diesel Throttle Body Assembly |
CAUTION / NOTICE / HINT
Note
After replacing the ECM, the new ECM needs registration (Click here ) and initialization Click here.
Tech Tips
Read freeze frame data using the GTS. 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.
PROCEDURE
CHECK ECM (POWER SOURCE OF THROTTLE POSITION SENSOR)
*a | Component with harness connected (ECM) |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPLACE ECM Click here |
OK |
INSPECT THROTTLE POSITION SENSOR VOLTAGE (VLU VOLTAGE)
*a | Component with harness connected (ECM) |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
CHECK HARNESS AND CONNECTOR Click here |
OK |
CHECK DTC OUTPUT
Connect the GTS to the DLC3.
Clear the DTCs.
Turn the ignition switch off.
Turn the ignition switch to ON for 3 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the DTCs.
Result | ||||||
---|---|---|---|---|---|---|
|
A |
CHECK FOR INTERMITTENT PROBLEMS Click here |
B |
REPLACE ECM Click here |
CHECK HARNESS AND CONNECTOR
*a | Front view of wire harness connector (to Diesel Throttle Body Assembly) |
Disconnect the diesel throttle body assembly connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR Click here |
OK |
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 | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
GO TO STEP 9 Click here |
OK |
CHECK ECM (CHECK RESISTANCE)
Disconnect the diesel throttle body assembly connector.
*a | Front view of wire harness connector (to Diesel Throttle Body Assembly) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPLACE ECM Click here |
OK |
REPLACE DIESEL THROTTLE BODY ASSEMBLY
Replace the diesel throttle body assembly.
Result | ||
---|---|---|
|
NEXT |
GO TO STEP 10 Click here |
REPLACE ECM
Replace the ECM.
Result | ||
---|---|---|
|
NEXT |
GO TO STEP 10 Click here |
REPAIR OR REPLACE HARNESS OR CONNECTOR
Repair or replace the harness or connector.
Result | ||
---|---|---|
|
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
Connect the GTS to the DLC3.
Clear the DTCs.
Turn the ignition switch off.
Turn the ignition switch to ON for 3 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Confirm that the DTC is not output again.
Result | ||
---|---|---|
|
NEXT |
END |
REPLACE ECM
Replace the ECM.
Result | ||
---|---|---|
|
NEXT |
GO TO STEP 10 Click here |