CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
54
DTC: P0601 ECU testing code failure
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
Clean up the DTC and check the failure once again if it
is a steady failure.
No
System if
correct
3 Replace ECU Finish
DTC: P0602 ECU diagnosis data ID code failure
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
Clean up the DTC and check the failure once again if it is
a steady failure.
No
System if
correct
3 Replace ECU Finish
DTC: P0645 Air conditioner compressor relay 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 air conditioner compressor relay; put ignition
switch to “ON”; check the voltage value between relay
power supply ends that relay pin No.30, No.85 and
power cathode and observe if it is around 12V.
No Next step
Yes
Repair or
replace
cable3
Check if there is open circuit or short circuit to ground
of the relay power supplying ends circuit.
No
To step
No.2
Yes
Replace
relay
4
Check the voltage value by the multimeter between air
conditioner compressor relay control ends that is relay
pin No.86 and power cathode and observe if it is around
3.7V.
No Next step
Yes
Repair or
replace
cable
5
Check if there is open circuit between the circuit of air
conditioner compressor relay control ends that is relay
pin No.86 and ECU pin No.70.
No
Diagnosis
help
