Engine Controls - MIL ON/DTC P1421 Stored In memory

Classification: EC09-015B

Reference: ITB09-031B

Date: April 21, 2011

2007-2009 QX56; MIL "ON" WITH DTC P1421 STORED

This bulletin has been amended. The APPLIED VEHICLES section and Table A have been revised. Please discard all previous copies.

APPLIED VEHICLES:
2007-2009 QX56 (JA60)

APPLIED VINS and DATES:
2007-2008: All
2009: Vehicles built before 5N3M08(**)9N 903556// January 7 2009

IF YOU CONFIRM:

An Applied Vehicle has the MIL "ON" and DTC P1421 (Cold Start Control) stored in the ECM.

ACTION:

Confirm this bulletin applies.

^ Check and compare your current ECM Part Number to Table A.

If that part number does not match one in Table A, this bulletin does not apply. Go back to ASIST for further diagnostic and repair information

If this bulletin applies reprogram the ECM.





CLAIMS INFORMATION

IMPORTANT:
The purpose of ACTION (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.

If you are not familiar with the reprogramming procedure. Refer to CONSULT-III (C-III) ECM Reprogramming general 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)

^ 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 P/N column in Table A.

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

^ 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.