Engine Electrical System

Diagnostic trouble code: P0511 “Malfunction in control circuit of idle speed
regulator”
Item
No.
Operation procedure
Inspection
results
Follow-up procedure
1
Connect the diagnostic tester and
adaptor, and turn the ignition switch to
“ON” position.
Proceed to next step.
Yes Proceed to next step.
2
Disconnect the connector of idle speed
regulator and inspect with multimeter to
verify that the resistances between pin A
and D, pin B and C are 53±5.3Ω under
20.℃
No
Replace the step
motor.
Yes
Repair or replace the
wiring harness.
3
Verify that the circuits between pin A, B,
C, and D of idle speed regulator and 65#,
66#, 67#, and 64# pin of ECU are open.
No
Refer to diagnosis
help.
E-53
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