Lifan 620 - DTC: P0122, Throttle Position Sensor Circuit Voltage too Low; DTC: P0123, Throttle Position Sensor Circuit Voltage too High

5. DTC: P0122, Throttle Position Sensor Circuit Voltage Too Low (see Table 1-18)
Table 1-18
S/N Operation Test Results Actions
1
Connect the diagnostic instrument and adapter, and turn the
ignition switch to ON.
Next step
Yes Next step
2
Check the “throttle absolute openning” as per the data flow.
Does it within 4%-10% (related to vehicle model)?
No Go to step 5
Yes Next step
3
Step on the accelerator, and check the “throttle absolute
openning” as per the data flow. Does it increase to about
85-95% with the widening of the throttle opening (related to
vehicle model)?
No Go to step 5
Yes Replace sensor
4
Repeat step 3, and check the “throttle absolute openning” as
per the data flow. Does jump occur during the process?
No Next step
Yes
Repair or replace
harness
5
Disconnect the throttle position sensor from the harness.
Check for short to ground between pin 17#, 32#, 16# of the
ECU and the pin 1#, 2#, 3# of the sensor with a multimeter.
No Next step
Yes Replace sensor
6
Measure the voltage between pin 1# and pin 2# with a
multimeter. Is the voltage about 5V?
No Diagnosis help
6. DTC: P0123, Throttle Position Sensor Circuit Voltage Too High (see Table 1-19)
Table 1-19
S/N Operation Test Results Actions
1
Connect the diagnostic instrument and adapter, and turn the
ignition switch to ON.
Next step
Yes Next step
2
Check the “throttle absolute openning” as per the data flow.
Does it within 4%-10% (related to vehicle model)?
No Go to step 5
Yes Next step
3
Step on the accelerator, and check the “throttle absolute
openning” as per the data flow. Does it increase to about
85-95% with the widening of the throttle opening (related to
vehicle model)?
No Go to step 5
Yes Replace sensor
4
Repeat step 3, and check the “throttle absolute openning” as
per the data flow. Does jump occur during the process?
No Next step
Yes
Repair or replace
harness
5
Disconnect the throttle position sensor from the harness.
Check for open circuit or short to power supply between pin
17#, 32#, 16# of the ECU and the pin 1#, 2#, 3# of the sensor
with a multimeter.
No Next step
Yes Replace sensor
6
Measure the voltage between pin 1# and pin 2# with a
multimeter. Is the voltage about 5V?
No Diagnosis help
48
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