DTC P0507 Idle Speed High. Oldsmobile Intrigue 1999

For 1990-2009 cars only

Makes 🢒 Oldsmobile 🢒 1999 🢒 Intrigue 🢒 DTC 🢒 DTC P0507 Idle Speed High

Engine Controls Components
MAF, IAC, EGR, and EVAP
OBD II Symbol Description Notice

Circuit Description

The PCM controls engine idle speed by adjusting the position of the Idle Air Control (IAC) motor pintle. The IAC is a bi-directional motor driven by two coils. The PCM sends pulses (steps) to the IAC to extend or retract the IAC pintle into a passage in the throttle body to decrease or increase air flow. The commanded IAC position (displayed in counts) can be monitored on the scan tool; a lower number of counts indicates less commanded airflow (pintle extended). This method allows highly accurate control of idle speed and quick response to changes in engine load. If the PCM detects a condition where too high of an idle speed is present and the PCM is unable to adjust idle speed by decreasing the IAC counts, DTC P0507 will set indicating a problem with the idle control system.

Conditions for Running the DTC

No VSS, TP sensor, EVAP system, misfire, IAT sensor, MAP sensor, fuel trim, fuel injector, EGR pintle position, ECT sensor, CKP sensor, or MAF sensor DTCs set.
BARO is greater than 65 kPa.
Engine has been running for at least 60 seconds.
System voltage is between 9 and 16 volts.
Engine Coolant Temperature is greater than 70°C (158°F).
Vehicle Speed is less than 3 MPH.
Intake Air Temperature is greater than -18°C (0°F).
The throttle is closed.

Conditions for Setting the DTC

•	Engine Speed is more than 175 RPM higher than Desired Idle (positive idle speed error greater than 175 RPM).

•	Above conditions for longer than 15 seconds.

Action Taken When the DTC Sets

•	The PCM will illuminate the MIL during the second consecutive trip in which the diagnostic test has been run and failed.

•	The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.

Conditions for Clearing the MIL/DTC

•	The PCM will turn the MIL OFF during the third consecutive trip in which the diagnostic has been run and passed.

•	The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

•	The DTC can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed.

Diagnostic Aids

Check for the following conditions:

•	Poor connection at PCM or IAC motor. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.

•	Damaged harness. Inspect the wiring harness for damage.

•	Vacuum leak. Check for a condition that causes a vacuum leak, such as disconnected or damaged hoses, leaks at EGR valve and EGR pipe to intake manifold, leaks at throttle body, malfunctioning or incorrectly installed PCV valve, leaks at intake manifold, etc.

•	Throttle body. Check for a sticking throttle plate. Also inspect the IAC passage for deposits or objects which will not allow the IAC pintle to fully extend.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Test Description

The number(s) below refer to the step number(s) on the Diagnostic Table.

This vehicle is equipped with a powertrain control module (PCM) which utilizes an electrically erasable programmable read-only memory (EEPROM). When the PCM is replaced, the new PCM must be programmed.

DTC P0507 - Idle Air Control System RPM High

Step

Action

Value(s)

Yes

Did you perform the Powertrain On-Board Diagnostic System Check?

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

Are any other DTC(s) set?

Diagnose the other DTC first.

Go to Step 3

Start the engine.
Turn off all accessories (A/C, Rear defroster etc.).
Use a scan tool in order to command RPM up to 1500, down to 650, and then up to 1500 while monitoring the Engine Speed.

Does the Engine Speed remain within the specified value of Desired Idle Speed for each RPM command?

± 100 RPM

Go to Diagnostic Aids

Go to Step 4

Disconnect the IAC.
Install a J 37027-A IAC System Monitor.
With the engine running, command the RPM up to 1500, down to 650, and then up to 1500 while observing the node light.

Does each node light cycle red and green (never OFF)?

Go to Step 6

Go to Step 5

Test the following circuits for an open, a short to voltage, or a short to ground:

•	The IAC A Low.

•	The IAC A High.

•	The IAC B Low.

•	The IAC B High.

If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Was a problem found?

Go to Step 11

Go to Step 9

Visually/physically inspect for the following conditions:

•	Any vacuum leaks.

•	Any throttle body tampering (throttle lever stop screw turned).

•	Any throttle plate or throttle shaft binding.

•	Misadjusted or binding accelerator and cruise control cables. Refer to Accelerator Control Cable Replacement .

•	A malfunctioning, missing, or incorrectly installed PCV valve. Refer to Crankcase Ventilation System Inspection .

If a problem is found, repair as necessary.

Was a problem found?

Go to Step 11

Go to Step 7

Inspect for a faulty connection at the IAC harness connector.
If a problem is found, replace the terminals as necessary. Refer to Connector Repairs in Wiring Systems.

Was a problem found?

Go to Step 11

Go to Step 8

Replace the IAC valve. Refer to Idle Air Control Valve Replacement .

Did you complete the repair?

Go to Step 11

Inspect for a faulty connection at the PCM harness connector.
If a problem is found, replace the terminals as necessary. Refer to Connector Repairs in Wiring Systems.

Was a problem found?

Go to Step 11

Go to Step 10

Important:: The replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming .

Replace the PCM.

Did you complete the repair?

Go to Step 11

Start the engine.
Turn off all accessories (A/C, Rear defroster etc.).
Use the scan tool in order to command the RPM up to 1500, down to 650, and then up to 1500 while monitoring the Engine Speed.

Does the Engine Speed remain within the specified value of Desired Idle Speed for each RPM command?

± 100 RPM

System OK

Go to Step 2