Engine Controls - MIL ON/DTC P1421 Stored
Classification: EC10-038A
Reference: ITB10-076A
Date: April 26, 2011
2008-2010 G37; MIL "ON" WITH DTC P1421 STORED
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This bulletin has been amended. Several changes have been made throughout the bulletin. Please discard all previous versions.
APPLIED VEHICLES:
2008 G37 Coupe (CV36)
2009-2010 G37 Sedan, Coupe & Convertible (V36, CV36, HV36)
IF YOU CONFIRM
An Applied Vehicle has the MIL ON with DTC P1421 (Cold Start Control) stored in the ECM.
ACTIONS
- Refer to step 2 in the ECM Reprogramming section of the Service Procedure to confirm this bulletin applies to the vehicle you are working on.
- If this bulletin applies reprogram the ECM.
- If instructed reprogram the TCM.
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
ECM Reprogramming
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.
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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.
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B. Compare the Part Number you wrote down to the numbers in the Current ECM Part Number column in Table A.
^ If there is a match this bulletin applies. Continue with the reprogramming procedure.
NOTE:
If more than two lines (reprogramming options) display on your C-III screen use the one that does not have either of the following message:
> "Caution Use ONLY with ITBXX-XXX"
> "Alert! For ECM Recovery ONLY"
^ 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).
2009-2010 G37 AT vehicles: Proceed to TCM Reprogramming.
All 2008 G37 vehicles, 2009-2010 G37 MT vehicles: Perform steps 4 and 5 below. DO NOT perform TCM Reprogramming procedure.
4. Make sure to erase DTCs from all systems.
NOTE:
During reprogramming DTCs will set in several systems and must be erased.
5. Test drive the vehicle and make sure it operates correctly and the MIL is OFF.
^ If the MIL comes ON, go back to ASIST for further diagnostic information.
TCM Reprogramming (For 2009-2010 G37 AT vehicles ONLY)
^ Make sure to erase DTCs from all Systems.
^ If you are not familiar with the TCM reprogramming procedure. Refer to "CONSULT- III (C-III) TCM Reprogramming" general procedure.
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- Restart the C-III session by selecting the Home icon in the upper left corner of the screen (see Figure 3).
- Navigate C-III to the reprogramming screen shown in the Figure 3 example above.
NOTE:
^ Do not use the Reprogramming / Programming selection.
^ Select the Model and Model Year and then navigate to Direct Diagnosis> Reprogramming.
^ TCM initialization is not needed for 7 Speed AT reprogramming.
3. On your C-III screen look for a Transmission Part Number in the Part Number column (see Figure 3 example).
^ If there is no Transmission Part Number listed proceed to step 6.
^ If a Transmission Part Number is listed write it on the Repair Order then proceed to step 4.
4. Compare the P/N you wrote down to the numbers in the Current TCM Part Number column in Table B, above.
^ If there is a match continue with the TCM reprogramming procedure. If there is not a match proceed to step 6.
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- If you have performed TCM reprogramming the screen in Figure 4 displays when reprogramming is complete.
- Make sure to erase DTCs from all Systems.
NOTE:
During reprogramming DTCs will set in several systems and must be erased.
7. Test drive the vehicle and make sure it operates correctly and the MIL is OFF.
^ If the MIL comes ON go back to ASIST for further diagnostic information.
