Q45 V8-4.5L (VK45DE) (2002)
Technical Service Bulletin # 02-040
Date: 020617
A/T - WOT Delay/Hesitation On 5th - 2nd Gear Downshift
Classification:
AT02-005
Reference:
ITB02-040
Date:
June 17, 2002
2002 Q45; 5-2 DOWNSHIFT DELAY/HESITATION AT 3/4-WOT THROTTLE AND 40-60 MPH
APPLIED VEHICLE:
2002 Q45 (F50)
SERVICE INFORMATION
If a 2002 Q45 has a "delayed" automatic transmission 5-2 downshift that feels like a hesitation (perhaps at 3/4 to WOT [Wide Open Throttle] and
between 40 - 60 MPH), use this Service Procedure to determine if the:
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Transmission Control Module (TCM) needs Reprogramming or replacement and if the
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Engine Control Module (ECM) needs Reprogramming.
NOTES:
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One of the noticeable results of ECM/TCM reprogramming (in this case) is a firmer 5-2 downshift.
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The ECM/TCM reprogramming data is available as of the 6/15/02 ASIST cd.
SERVICE PROCEDURE OVERVIEW