CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
38
DTC: P0123 Circuit voltage is much higher of the throttle position sensor
No. Operating steps Result Follow up steps
1
Connect the diagnostic tester and commutator, put
the ignition switch to “ON”
Next step
Yes Next step
2
Observe “throttle valve absolute opening”item in
data flow, check the value if it is between 4% and
10% (specific data is correlated to the vehicle type).
No To step No. 5
Yes Next step
3
Step on the accelerator slowly to complete opening
and observe “throttle valve absolute opening”item
in data flow, check if the value is increased to around
85-90% with the opening of the throttle valve
(specific data is correlated to the vehicle type).
No To step No. 5
Yes Replace the sensor
4
Repeat step 3 and observe “throttle valve absolute
opening”item in data flow, and check if there is
jump during the changes.
No Next step
Yes
Repair or replace
cable
5
Take off the joint of throttle valve positioning sensor
on the cable, check if there is open circuit or short
circuit to power supply between pin No.17, No.32,
No.16 of ECU and pin No.1, No.2, No.3 of sensor
No Next step
Yes Replace sensor
6
Check the voltage between pin No.1 and pin No.2 by
multimeter and observe if it is around 5V.
No Diagnosis help
DTC: P0130 Unreasonable failure of the upstream oxygen sensor signal
(Notice: below diagnosis process is fit for those without P0135 at the same time; if there is
P0135 failure, please deal with P0135 failure at first and then check as below.)
No. Operating steps Result Follow up steps
1
Connect the diagnostic tester and commutator, put
the ignition switch to “ON”
Next step
Yes Diagnosis help
2
Start the engine and leave it at idle speed until its
coolant reaches to the normal value. Observe the
value changes of “oxygen sensor voltage”item on
diagnostic meter, the displayed value should change
rapidly from 100mV-900mV.
No Next step
Yes
Repair or change
cable
3
Check if there is short circuit to ground between pin
No.36, No.18, of ECU and pin A (opposite to oxygen
sensor gray connecting line), B (opposite to oxygen
sensor black connecting line).
No Next step
DTC: P0132 Much higher voltage of upstream oxygen sensor
(Notice: below diagnosis process is fit for those without P0135 at the same time; if there is
P0135 failure, please deal with P0135 failure at first and then check as below.)
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