Dtc P0507 Idle Speed Rpm Higher Than Desired Idle Speed - Daewoo CIELO EURO III Manual

Action Taken When the DTC Sets
D The Malfunction Indicator Lamp (MIL) will illuminate
after three (1.5L SOHC)
consecutive trip with a fail.
D The ECM will record operating conditions at the
time the diagnostic fails. This information will be
stored in the Freeze Frame and Failure Records buff-
ers.
D A history DTC is stored.
Conditions for Clearing the MIL/DTC
D The MIL will turn off after three (four –
1.5L SOHC) consecutive ignition cycles in which the
diagnostic runs without a fault.
D A history DTC will clear after 40 consecutive warm up
cycles without a fault.
D DTC(s) can be cleared by using the scan tool.
Diagnostic Aids
Inspect the IAC valve electrical connection for proper
mating.
Inspect the wiring harness for damage.
Inspect throttle stop screw for signs of tampering.
Inspect throttle linkage for signs of binding or excessive
wear.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Table.
1. The On-Board Diagnostic (EOBD) System Check
prompts the technician to complete some basic
checks and store the freeze frame and failure re-
cords data on the scan tool if applicable. This
creates an electronic copy of the data taken when
the malfunction occurred. The information is then
stored on the scan tool for later reference.

DTC P0507 Idle Speed RPM Higher Than Desired Idle Speed

Step
Perform an On-Board Diagnostic (EOBD) System
Check.
1
Is the system check complete?
1. Turn the ignition switch ON, with the engine OFF.
2. Engine at normal operating temperature.
3. Transmission in park or neutral and the parking
brake set.
4. A/C is Off.
2
5. Install a scan tool and command the Idle Air
Control (IAC) valve up and down between the
specified values.
Does the engine rpm change smoothly when com-
manded by the scan tool?
DAEWOO T-154 BL2,3
Action
ENGINE CONTROLS 1F – 337
2. A normally operating IAC system will be able to be
extended and retracted by a scan tool and change
the engine idle rpm. Valve movement is verified by
an engine rpm change.
3. If the scan tool was able to command the IAC valve
smoothly, a malfunction may still exist internally with-
in the IAC valve. This can be checked by checking
the IAC valves internal resistance.
5. The IAC circuits always have ground or voltage sig-
nals on them in pairs. If the test light illuminates on
more or less than 2 terminals, 1 of the circuits is
shorted to voltage or open.
6. The IAC circuits always have ground or voltage sig-
nals on them in pairs. If the test light illuminates on
more or less than 2 terminals, 1 of the circuits is
shorted to ground or open
8. The IAC circuits are constantly switched between
ground and voltage so the test light should blink on
all circuits when connected to ground.
10. Any circuitry, that is suspected as causing the inter-
mittent complaint, should be thoroughly checked for
backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals,
poor terminal-to-wiring connections or physical
damage to the wiring harness.
12. A test light that remains ON constantly indicates that
the circuit is shorted to voltage.
14. The replacement ECM must be repro-
grammed. Refer to the latest Techline procedure for
ECM reprogramming.
16. If no malfunctions have been found at this point and
no additional DTCs were set, refer to "Diagnostic
Aids" in this section for additional checks and infor-
mation.
Value
–
Go to Step 2
900-
2000 rpm Go to Step 3
Yes No
Go to
"On-Board
Diagnostic
System Check"
Go to Step 5