Great Wall GW491QE, Service Manual

Page: 82 / 222

EF.1-63
Fault code
：
P0508 The voltage in the control loop of idle-speed adjustor is too low.
”
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
Pull out the plug from idle-speed adjustor, and a multimeter may be used to
verify whether the resistance values between Pin A and D, and between Pin B
and C are about
53
±
5.3
Ω
when at 20
℃
.
No Change the step motor.
Yes
Repair or change the wiring
harness.
3
Check whether respective loops between the connection Pin A /B /C /D of
idle-speed adjustor and the Pin 65 /66 /67/ 64 of ECU are short circuit to
ground.
No Diagnosis help.
Fault code
：
P0509 The voltage in the control loop of idle-speed adjustor is too high.
”
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
Pull out the plug from idle-speed adjustor, and a multimeter may be used to
verify whether the resistance values between Pin A and D, and between Pin B
and C are about
53
±
5.3
Ω
when at 20
℃
.
No Change the step motor.
Yes
Repair or change the wiring
harness.
3
Check whether respective loops between the connection Pin A /B /C /D of
idle-speed adjustor and the Pin 65 /66 /67/ 64 of ECU are short circuit to
ground.
No Diagnosis help.
Fault code
：
P0511 Failure with the control loop of idle-speed adjustor.
”
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
Pull out the plug from idle-speed adjustor, and a multimeter may be used to
verify whether the resistance values between Pin A and D, and between Pin B
and C are about
53
±
5.3
Ω
when at 20
℃
.
No Change the step motor.
Yes
Repair or change the wiring
harness.
3
Check whether respective loops between the connection Pin A /B /C /D of
idle-speed adjustor and the Pin 65 /66 /67/ 64 of ECU are a broken loop
No Diagnosis help.
Fault code
：
P0560 Inappropriate signal of system voltage.
”
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
Repair or change the wiring
harness.
3
Check whether the respective loop between Pin 87 of main relay and Pin 44
/45 /63 of ECU is a broken loop or short circuit to ground.
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
：
P0562 The signal of system voltage is too low.
”
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.
M7.9.7 system service &diagnosis flow process based on fault code
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