Chery A21 2005, Service Manual, Page: 365 / 475

CHERY
·
A21 SERVICE MANUAL ENGINE EFI SYSTEM
42
No. Operating steps Result Follow up steps
1
Connect the diagnostic tester and commutator, put the
ignition switch to
“
OFF
”
Next step
Yes Next step
2
Take off the knock sensor joint from the cable; check
the resistance value by multimeter between knock
sensor connector No.1and No.2 and observe if it is
1M
Ω
.
No Change sensor
Yes
Repair or replace
the cable 3
Check if there is open circuit or short circuit to ground
or to power supply between circuit of knock sensor
joint No.1, No.2 and ECU pin No.19, No. 20
No To step No.2
Yes Diagnosis help
4
Replace the knock sensor according to the regulation;
try running the vehicle and make the engine speed
exceed 2200rpm. Check if the DTC P0325 will appear
again.
No
Check if it is a
occasional fault
DTC: P0335 Crank shaft position sensor signal failure
No. Operating steps Result Follow up steps
1
Connect the diagnostic tester and commutator, put the
ignition switch to
“
OFF
”
Next step
Yes Next step
2
Take off the speed sensor joint from the cable; check
the resistance value by multimeter between speed
sensor connector No.2and No.3 and observe if it is
around 770-950M
Ω
when it is 20
℃
No Replace sensor
Yes
Repair or replace
the cable 3
Check if there is open circuit or short circuit to ground
or to power supply between circuit of speed sensor
joint No.2, No.3 and ECU pin No.34, No. 15
No Next step
Yes Diagnosis help
4
Check the flywheel signal disc if it is in good
conditions.
No
Replace signal
disc
DTC: P0336 Crank shaft position sensor signal unreasonable failure
No. Operating steps Result Follow up steps
1
Connect the diagnostic tester and commutator, put
the ignition switch to
“
OFF
”
Next step
Yes Next step
2
Take off the speed sensor joint from the cable; check
the resistance value by multimeter between speed
sensor connector No.2and No.3 and observe if it is
around 770-950M
Ω
when it is 20
℃
No Replace sensor
Yes
Repair or replace the
cable
3
Check if there is open circuit or short circuit to
ground or to power supply between circuit of speed
sensor joint pin No.2, No.3 and ECU pin No.34, No.
15
No Next step
Yes Diagnosis help
4
Check the flywheel signal disc if it is in good
conditions.
No Replace signal disc
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