Engine Electrical System

8) Unstable idle speed or stall with load (A/C and etc.)
Yes
Fix the indicated
malfunction
1
Turn the ignition switch to “ON” position.
Inspect with the diagnostic tester to see
whether there is any malfunction
information record.
No Proceed to next step.
Yes Proceed to next step.
2
Turn on the A/C switch and connect the
adaptor between ECU and the wiring
harness. Measure and see whether the
ECU’s A/C switch and pressure signal
have any signal input.
No
Overhaul the A/C
circuit.
Yes Proceed to next step.
3
Verify that the pressure of A/C system,
the magnetic clutch of compressor and
A/C pump are normal.
No Repair or replace.
Yes Proceed to next step.
4
Turn the ignition switch to “ON” position.
Verify that the voltages at ECU’s pins of
65#, 64#, 67#, and 66# (output connected
to idle actuator) are normal.
No
Inspect the control
circuit.
Yes
Repair or replace the
step motor. 5
Remove the step motor to verify that it is
jammed or runs unfreely.
No Proceed to next step.
Yes Replace the ECU.
6
Start up the engine and turn on the A/C.
Inspect with the diagnostic tester through
the step amount of step motor to see
whether the idle actuator functions
normally. (The normal step amount will
be provided otherwise)
No
Replace the idle
actuator.
E-75
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