Engine Controls - MIL ON/DTC P1421 Stored

Classification: EC08-022C

Reference: ITB08048C

Date: March 2, 2011

2009-10 FX50; MIL "ON" WITH DTC P1421 (COLD START CONTROL) STORED

This bulletin has been amended. The Applied Vehicle Information and Service Procedure have been updated. No other changes have been made. Please discard all previous versions of this bulletin.

APPLIED VEHICLE: 2009-2010 FX50 (S51)

APPLIED ENGINE: VK50 ONLY

IF YOU CONFIRM:

If an Applied Vehicle has the MIL 'ON' with DTC P1421 (Cold Start Control)
stored in the ECM

and

There are no drivability issues,

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 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. Close C-III and refer to ASIST for further diagnostic information.

^ If a Part Number is listed, write it on the Repair Order.





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. Close C-III and refer to ASIST for further diagnostic information.





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

NOTE:
If the screen in Figure 2 does not display (reprogramming does not complete).

4. Make sure to erase DTCs from all Systems.

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

5. Test drive the vehicle and make sure it operates correctly and the 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 the ECM reprogramming are not covered by this bulletin.