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 - Lifan 620 Maintenance Manual

32. DTC: P0601, Electronic Control Unit Check Code Unprogrammed (see Table 1-45)
S/N
Connect the diagnostic instrument and adapter, and turn the
1
ignition switch to ON.
2 Clear the DTC, and check once again if the trouble is stable.
3 Replace ECU.

33. DTC: P0602, Electronic Control Unit Diagnostic Data Identification Code Unprogrammed

(see Table 1-46)
S/N
Connect the diagnostic instrument and adapter, and turn the
1
ignition switch to ON.
2 Clear the DTC, and check once again if the trouble is stable.
3 Replace the ECU.
34. DTC: P0645, A/C Compressor Relay Control Circuit Trouble (see Table 1-47)
S/N
Connect the diagnostic instrument and adapter, and turn the
1
ignition switch to OFF.
Disconnect the A/C compressor relay, and turn the ignition
switch to ON. Measure the voltage between pin 30#, 86# of
2
the relay (power supply end) and the power supply negative
pole. Is the voltage about 12V?
Check for open circuit or short to ground at the power supply
3
end of the relay.
Measure the voltage between the pin 86# of the relay
4 (control end) and the power supply negative pole with a
multimeter. Is the voltage about 3.7V?
Check for open circuit between the pin 86# of the relay
5
(control end) and the 70# of the ECU with a multimeter.
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Table 1-45
Operation
Table 1-46
Operation
Table 1-47
Operation
63
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Test Results Actions
Next step
Yes Next step
No Normal
End
Test Results Actions
Next step
Yes Next step
No Normal
End
Test Results Actions
Next step
Yes 4 Go to step
No Next step
Repair or replace
Yes
harness
No Go to step 2
Yes Replace relay
No Next step
Repair or replace
Yes
harness
No Diagnosis help