Great Wall GW491QE, Service Manual

Page: 83 / 222

EF.1-64
S.N. Operation steps
Check
result
Follow-up steps
Yes
Repair or change the wiring
harness.
3
Check whether the resistance in the respective loop between Pin 87 of main
relay and Pin 44 /45 /63 of ECU is too large.
No Next step.
Yes Next step.
4
Check whether the charge voltage of generator is always within a scope of
9-16 V while engine is starting at various rotating-speed.
No Change the generator
Yes Diagnosis help.
5
Check whether the ground point of engine wiring harness is under a good
condition.
No
Repair or change the wiring
harness.
Fault code
：
P0563 The voltage signal of system is too high.
”
S.N. Operation steps
Check
result
Follow-up steps
1
Connect with a diagnosis instrument, and place the ignition switch to the
OFF
”
position.
Next step.
Yes Next step.
2
A multimeter may be used to verify whether the voltage of accumulator jar is
about 12V.
No Change the accumulator jar.
Yes Next step.
3
Check whether the charge voltage of generator is always within a scope of
9-16 V while engine is starting at various rotating-speed.
No
Change the generator
Yes Diagnosis help.
4
Check whether the ground point of engine wiring harness is under a good
condition.
No
Repair or change the wiring
harness.
Fault code
：
P0601 The verification code for electronic controller has not been programmed yet
”
S.N. Operation steps
Check
result
Follow-up steps
1
Connect with the diagnosis instrument, and place the ignition switch to the
ON
”
position.
Next step.
Yes
Next step.
2
Clear away any fault code, and re-verify whether the failure is of a stable
failure.
No System is normal.
3 Change ECU.
END
Fault code
：
P0602 The diagnosis data ID code of electronic controller has not been programmed
yet.
”
S.N. Operation steps
Check
result
Follow-up steps
1
Connect with the diagnosis instrument, and place the ignition switch to the
ON
”
position.
Next step.
Yes
Next step.
2
Clear away any fault code, and re-verify whether the failure is of a stable
failure.
No System is normal.
3 Change ECU. END
Fault code
：
P0645 Failure with the control loop of air-conditioner compressor relay.
”
S.N. Operation steps
Check
result
Follow-up steps
1
Connect with a diagnosis instrument, and place the ignition switch to the
OFF
”
position.
Next step.
Yes
Continue to proceed until
step 4.
2
Pull out the relay from the air-conditioner compressor, place the ignition
switch to the
ON
”
position, and verify the voltage between the power supply
end (i.e. Pin 30 &85) of relay and the negative electrode of power supply is
about 12V.
No Next step.
Yes
Repair or change the wiring
harness.
3
Check whether the loop on the power supply end of relay is a broken loop or
short circuit to ground.
No
Continue to proceed until
step 2.
Yes Change the relay.
4
A multimeter may be used to verify the voltage between the control end (i.e.
Pin 86 of relay) of air-conditioner compressor relay and the negative electrode
of power supply is about 3.7V.
No Next step.
M7.9.7 system service &diagnosis flow process based on fault code
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