Engine Controls - Engine Hesitation/Low Idle Speed

Classification: EC10-019

Reference: ITB10-042

Date: June 29, 2010

2009-2010 FX35; ENGINE HESITATION OR LOW IDLE AT VERY LOW SPEEDS

APPLIED VEHICLES: 2009-2010 FX35 (S51)

IF YOU CONFIRM

The customer reports any of the following:

^ Engine hesitation at idle or very low speeds,

and/or

^ Engine speed drops lower than expected when decelerating or coming to a stop.

ACTIONS

1. Refer to Step 2 in the Service Procedure to confirm this bulletin applies to the vehicle you are working on.

2. If this bulletin applies, reprogram the ECM.





CLAIMS INFORMATION

IMPORTANT:
The purpose of ACTIONS (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing this repair.

SERVICE PROCEDURE

1. Connect CONSULT III (C-III) to the vehicle to begin the reprogramming procedure.





CAUTION





2. When you get to the ECM Reprogramming screen shown in Figure 1, confirm this bulletin applies as follows:

A. On your C-III screen, look at the Part Number column (see Figure 1 example).

^ If this column is blank (no part number listed), this bulletin does not apply.

^ If a Part Number is listed, write it on the Repair Order and then go to Step B.





B. Compare the Part Number you wrote down to the numbers in the Current ECM Part Number column in Table A above.

^ If there is a match, this bulletin applies. Continue with the reprogramming procedure.

NOTE:
If there are two lines (two reprogramming options) on your C-III screen, use the one that does not have the message "Caution! Use ONLY with ITBXX-XXX".

^ If there is not a match, this bulletin does not apply.





3. If this bulletin applies and you have performed ECM reprogramming, the screen in Figure 2 appears when reprogramming is complete.

^ Print the page from C-III (C-III page example below) and attach it to the Repair Order for Warranty documentation.

4. Make sure to erase all DTCs from all Systems.

NOTE:
During reprogramming, DTCs will set in several systems. These DTCs must be erased from all systems.

5. Test drive the vehicle and make sure it operates correctly and the MIL (Check Engine light) is OFF.

^ If the Check Engine light comes ON, go back to ASIST for further diagnostic information. Refer to the applicable Electronic Service Manual as needed.

^ Diagnosis and repairs beyond ECM reprogramming are not covered by this bulletin.