Lifan 620 - DTC: P0601, Electronic Control Unit Check Code Unprogrammed; DTC: P0602, Electronic Control Unit Diagnostic Data Identification Code Unprogrammed; DTC: P0645, A;C Compressor Relay Control Circuit Trouble

32. DTC: P0601, Electronic Control Unit Check Code Unprogrammed (see Table 1-45)
Table 1-45
S/N Operation Test Results Actions
1
Connect the diagnostic instrument and adapter, and turn the
ignition switch to ON.
Next step
Yes Next step
2 Clear the DTC, and check once again if the trouble is stable.
No Normal
3 Replace ECU. End
33. DTC: P0602, Electronic Control Unit Diagnostic Data Identification Code Unprogrammed
(see Table 1-46)
Table 1-46
S/N Operation Test Results Actions
1
Connect the diagnostic instrument and adapter, and turn the
ignition switch to ON.
Next step
Yes Next step
2 Clear the DTC, and check once again if the trouble is stable.
No Normal
3 Replace the ECU. End
34. DTC: P0645, A/C Compressor Relay Control Circuit Trouble (see Table 1-47)
Table 1-47
S/N Operation Test Results Actions
1
Connect the diagnostic instrument and adapter, and turn the
ignition switch to OFF.
Next step
Yes 4 Go to step
2
Disconnect the A/C compressor relay, and turn the ignition
switch to ON. Measure the voltage between pin 30#, 86# of
the relay (power supply end) and the power supply negative
pole. Is the voltage about 12V?
No Next step
Yes
Repair or replace
harness
3
Check for open circuit or short to ground at the power supply
end of the relay.
No Go to step 2
Yes Replace relay
4
Measure the voltage between the pin 86# of the relay
(control end) and the power supply negative pole with a
multimeter. Is the voltage about 3.7V?
No Next step
Yes
Repair or replace
harness
5
Check for open circuit between the pin 86# of the relay
(control end) and the 70# of the ECU with a multimeter.
No Diagnosis help
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