Maintenance Manual for Chery·Windcloud Marelli EFI System
Failure: too low control circuit voltage of idle speed regulator
Step Operation Result Solution
1
Connect scanner and commutator, and then turn
ignition switch to “ON”.
Go to next step
Yes Go to next step
2
Unplug idle speed regulator connector, check
respectively the resistances between Pin A and Pin
D, Pin B and Pin C of the regulator with a
multimeter too see if they are around 53Ω at 20℃.
No
Replace
stepper motor
Yes
Repair or
replace wire
harness
3
Check respectively the connections between Pin A,
B, C, D of idle speed regulator connector and Pin
64, 65, 57, 58 of ECU to see if short circuit to
ground occurs.
No
Diagnosis
Instruction
Failure: too high control circuit voltage of idle speed regulator
Step Operation Result Solution
1
Connect scanner and commutator, and then turn
ignition switch to “ON”.
Go to next step
Yes Go to next step
2
Unplug idle speed regulator connector, check
respectively the resistances between Pin A and Pin
D, Pin B and Pin C of the regulator with a
multimeter too see if they are around 53Ω at 20℃.
No
Replace
stepper motor
Yes
Repair or
replace wire
harness
3
Check respectively the connections between Pin A,
B, C, D of idle speed regulator connector and Pin
64, 65, 57, 58 of ECU to see if short circuit occurs.
No
Diagnosis
Instruction
Failure: control circuit error of idle speed regulator
Step Operation Result Solution
1
Connect scanner and commutator, and then turn
ignition switch to “ON”.
Go to next step
Yes Go to next step
2
Unplug idle speed regulator connector, check
respectively the resistances between Pin A and Pin
D, Pin B and Pin C of the regulator with a
multimeter too see if they are around 53Ω at 20℃.
No
Replace
stepper motor
3
Check respectively the connections between Pin A,
B, C, D of idle speed regulator connector and Pin
64, 65, 57, 58 of ECU to see if open circuit occurs.
Yes
Repair or
replace wire
harness
30
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