Chery A21 2005 Service Manual page 359

CHERY·A21 SERVICE MANUAL
DTC: P0123 Circuit voltage is much higher of the throttle position sensor
No.
Connect the diagnostic tester and commutator, put
1
Observe "throttle valve absolute opening" item in
2 data flow, check the value if it is between 4% and
10% (specific data is correlated to the vehicle type).
Step on the accelerator slowly to complete opening
and observe "throttle valve absolute opening" item
3 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).
Repeat step 3 and observe "throttle valve absolute
4 opening" item in data flow, and check if there is
Take off the joint of throttle valve positioning sensor
on the cable, check if there is open circuit or short
5
circuit to power supply between pin No.17, No.32,
No.16 of ECU and pin No.1, No.2, No.3 of sensor
Check the voltage between pin No.1 and pin No.2 by
6
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.
Connect the diagnostic tester and commutator, put
1
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
2
diagnostic meter, the displayed value should change
Check if there is short circuit to ground between pin
No.36, No.18, of ECU and pin A (opposite to oxygen
3
sensor gray connecting line), B (opposite to oxygen
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.)
PDF created with pdfFactory Pro trial version
Operating steps
the ignition switch to "ON"
jump during the changes.
multimeter and observe if it is around 5V.
Operating steps
the ignition switch to "ON"
rapidly from 100mV-900mV.
sensor black connecting line).
36
www.pdffactory.com
ENGINE EFI SYSTEM
Result Follow up steps
Next step
Yes Next step
No To step No. 5
Yes Next step
No To step No. 5
Yes Replace the sensor
No Next step
Repair or replace
Yes
cable
No Next step
Yes Replace sensor
No Diagnosis help
Result Follow up steps
Next step
Yes Diagnosis help
No Next step
Repair or change
Yes
cable
No Next step