Chery automobile Service Manual page 160

Diagnostic trouble code: P0508 "Undervoltage in control circuit of idle speed
regulator"
Item
Operation procedure
No.
Connect the diagnostic tester and adaptor,
1 and turn the ignition switch to "ON"
position.
Disconnect the connector of idle speed
regulator and inspect with multimeter to
2 verify that the resistances between pin A
and D, pin B and C are 53±5.3Ω under
20 .
Verify that the circuits between pin A, B,
C, and D of idle speed regulator and 65#,
3
66#, 67#, and 64# pin of ECU are short to
ground.
Inspection
results
Yes
No
Yes
No
G-51
Follow-up
procedure
Proceed to next
step
Proceed to next
step
Replace the step
motor.
Repair or replace
the wiring harness.
Refer to diagnosis
help.