High idle, code P0507

VIKING76

MEMBER
2003 INFINITI I35
92,000 MILES

After changing throttle body, the car will not take the idle relearn procedure. The idle is at 1,000-1,100 still. How can I get it down? The "engine service" light remains on, and the car will not pass NYS inspection. I have cleaned the Air Intake Sensor, no help. Is there a way to get this idle down without buying a new ECM that the dealership suggest?

1 Reply

ASEMASTER6371

MECHANIC
52,797 POSTS

Good evening

Did you use a new throttle body or used one?

There is an idle relearn volume procedure that has to be done. It is best to use a scan tool for this but can be done without the scan tool. The procedure is below

Roy

DESCRIPTION
"Idle Air Volume Learning" is an operation to learn the idle air volume that keeps each engine within the specific range. It must be performed under any of the following conditions:
- Each time electric throttle control actuator or ECM is replaced.
- Idle speed or ignition timing is out of specification.

PREPARATION
Before performing "Idle Air Volume Learning", make sure that all of the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are missed for even a moment.
- Battery voltage: More than 12.9 V (At idle)
- Engine coolant temperature: 70 - 99 °C (158 - 210 °F)
- PNP switch: ON
- Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, set lighting switch to the 1st position to light only small lamps.
- Steering wheel: Neutral (Straight-ahead position)
- Vehicle speed: Stopped
- Transmission: Warmed-up
For models with CONSULT-II, drive vehicle until "FLUID TEMP SE" in "DATA MONITOR" mode of "A/T" system indicates less than 0.9 V.
For models without CONSULT-II, drive vehicle for 10 minutes.

OPERATION PROCEDURE

With CONSULT-II

NOTE:
Before perform "Idle Air Volume Learning", make sure that "Accelerator Pedal Released Position Learning" and "Throttle Valve Closed Position Learning" are completed.

If not, perform "Accelerator Pedal Released Position Learning" and "Throttle Valve Closed Position Learning".
1. Start engine and warm it up to normal operating temperature.
2. Check that all items listed under the topic "PRE-CONDITIONING" (previously mentioned. Are in good order.

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3. Select "IDLE AIR VOL LEARN" in "WORK SUPPORT" mode.

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4. Touch "START" and wait 20 seconds.

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5. Make sure that "CMPLT" is displayed on CONSULT-II screen. If "CMPLT" is not displayed, "Idle Air Volume Learning" will not be carried out successfully. In this case, find the cause of the problem by referring to the "Diagnostic Procedure".

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6. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications.

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Without CONSULT-II

NOTE:
- It is better to count the time accurately with a clock.
- It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has a malfunction.

NOTE:
Before perform "Idle Air Volume Learning", make sure that "Accelerator Pedal Released Position Learning" and "Throttle Valve Closed Position Learning" are completed.

If not, perform "Accelerator Pedal Released Position Learning"and "Throttle Valve Closed Position Learning".
1. Start engine and warm it up to normal operating temperature.
2. Check that all items listed under the topic "PRE-CONDITIONING" (previously mentioned. Are in good order.
3. Turn ignition switch "OFF" and wait at least 10 seconds.
4. Confirm that accelerator pedal is fully released, turn ignition switch "ON" and wait 3 seconds.
5. Repeat the following procedure quickly five times within 5 seconds.
1. Fully depress the accelerator pedal.
2. Fully release the accelerator pedal.

6. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL goes off.
7. Fully release the accelerator pedal within 3 seconds after the MIL goes off.
8. Start engine and let it idle.
9. Wait 20 seconds.

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10. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications.
11. If idle speed and ignition timing are not within the specification, "Idle Air Volume Learning" will not be carried out successfully.
In this case, find the cause of the problem by referring to the "Diagnostic Procedure".

DIAGNOSTIC PROCEDURE
If idle air volume learning cannot be performed successfully, proceed as follows:
1. Check that throttle valve is fully closed.
2. Check PCV valve operation.
3. Check that downstream of throttle valve is free from air leakage.
4. When the above three items check out OK, engine component parts and their installation condition are questionable. Check and eliminate the cause of the problem. It is useful to perform "TROUBLE DIAGNOSIS -SPECIFICATION VALUE".
5. If any of the following conditions occur after the engine has started, eliminate the cause of the problem and perform "Idle air volume learning" all over again:
- Engine stalls.
- Erroneous idle.

P0507
Descriptor
Probable Causes
Electric Throttle Control Actuator
Intake Air Leak