CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
43
cylinder injector pin No.2 and power supply cathode,
and observe if it is around 3.7V.
No Next step
Yes
Repair or replace
cable6
Check if there is open circuit or short circuit to ground
between 3
rd
cylinder injector joint pin No.2 and the
ECU pin No.7.
No Diagnosis help
DTC: P0204 The 4
th
cylinder injector circuit failure
No. Operating steps Result Follow up steps
1
Connect the diagnostic tester and commutator, put the
ignition switch to “ON”
Next step
Yes To step No.4
2
Take off the 4
th
cylinder injector joint from the cable,
check the voltage value between this joint pin No.1
and the power cathode by multimeter and observe if it
is 12V.
No Next step
Yes
Repair or replace
the cable3
Check if there is open circuit or short circuit to ground
between the 4
th
injector joint pin No.1 and main relay.
No Next step
Yes Next step
4
Check the resistance value by multimeter between 4
th
cylinder injector pin No.1 and No.2, and observe if it
is 11-13Ω when it is 20℃.
No Replace injector
Yes Diagnosis help
5
Check the voltage value by multimeter between 4
th
cylinder injector pin No.2 and power supply cathode,
and observe if it is around 3.7V.
No Next step
Yes
Repair or replace
cable6
Check if there is open circuit or short circuit to ground
between 4
th
cylinder injector joint pin No.2 and the
ECU pin No.47.
No Diagnosis help
DTC: P0230 Fuel pump control circuit failure
No. Operating steps Result Follow up steps
1
Connect the diagnostic tester and commutator, put the
ignition switch to “OFF”
Next step
Yes To step No.4
2
Take off the fuel pump relay and put ignition switch to
“ON”; check the voltage separately between fuel
pump relay power supply ends - that is relay pin No.
30 and No.86 and power supply cathode, and observe
if it is around 12V.
No Next step
Yes
Repair or replace
the cable3
Check if there is open circuit or short circuit to ground
of the relay power supply ends circuit.
No To step No.2
Yes
Replace fuel
pump relay4
Check the voltage by multimeter between fuel pump
relay control ends that is relay pin No. 85 and power
supply cathode and observe if it is around 3.7V.
No Next step
5 Check if there is open circuit or short circuit to ground
Yes Repair or replace
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