CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)
CHECK ECM TERMINAL VOLTAGE (VC TERMINAL)
REPLACE DIESEL THROTTLE BODY ASSEMBLY
CHECK WHETHER DTC OUTPUT RECURS
DTC P0120 Throttle / Pedal Position Sensor / Switch "A" Circuit |
DTC P0122 Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input |
DTC P0123 Throttle / Pedal Position Sensor / Switch "A" Circuit High Input |
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.The ECM determines the vehicle's driving conditions from the signals input to its VLU terminal. The data is one of the inputs used for EGR control, etc.
| DTC No. | DTC Detection Condition | Trouble Area |
| - | Condition of DTC P0120, P0122, or P0123 continues for 0.5 seconds (open or short in throttle position sensor circuit) | - |
| P0120 | Throttle position sensor output (VLU) varies beyond normal operating range (less than 0.2 V or more than 4.8 V) (1-trip detection logic) |
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| P0122 | Throttle position sensor output (VLU) is less than 0.2 V (1-trip detection logic) |
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| P0123 | Throttle position sensor output (VLU) is more than 4.8 V (1-trip detection logic) |
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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
- ПРИМЕЧАНИЕ:
- After replacing the ECM, the new ECM needs registration (See page Нажмите здесь) and initialization (See page Нажмите здесь).
- УКАЗАНИЕ:
- Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 throttle position sensor connector.
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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 B40-1 (VC) - B31-73 (VCVL) Always Below 1 Ω B40-3 (VTA) - B31-119 (VLU) Always Below 1 Ω B40-2 (E2) - B31-96 (EVLU) Always Below 1 Ω
- Standard resistance (Check for short):
Tester Connection Condition Specified Condition B40-1 (VC) or B31-73 (VCVL) - Body ground Always 10 kΩ or higher B40-3 (VTA) or B31-119 (VLU) - Body ground Always 10 kΩ or higher B40-2 (E2) or B31-96 (EVLU) - Body ground Always 10 kΩ or higher
Reconnect the throttle position sensor connector.
Reconnect the ECM connector.
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| OK | |
| 2.CHECK ECM TERMINAL VOLTAGE (VC TERMINAL) |
Disconnect the throttle position sensor connector.
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Turn the ignition switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection Switch Condition Specified Condition B40-1 (VC) - B40-2 (E2) Ignition switch on (IG) 4.5 to 5.5 V
Reconnect the throttle position sensor connector.
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| OK | |
| 3.REPLACE DIESEL THROTTLE BODY ASSEMBLY |
Replace the diesel throttle body assembly (See page Нажмите здесь).
| NEXT | |
| 4.CHECK WHETHER DTC OUTPUT RECURS |
Connect the intelligent tester to the DLC3.
Turn the ignition switch on (IG) and turn the tester on.
Clear the DTCs (See page Нажмите здесь).
Start the engine.
Let the engine idle for 60 seconds.
Repeat engine running to 2500 rpm quickly for 30 seconds.
Read the DTCs.
- Result:
Result Proceed to DTC P0120, P0122 and/or P0123 are output A DTC is not output B
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| A | ||
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