SL 550 (230.471) V8-5.5L (273.965) (2008)
Engine Control Module: All Technical Service Bulletins
Engine Controls - Engine Won't Start When Hot
Date: February 11, 2009
Order No.: S-B-54.21/215
Supersedes:
Group: 54
SUBJECT:
All Models Equipped with Engine M272 and M273
Engine Cannot Be Started When Engine is Hot but Will Start After Engine has Cooled
If you receive customer reports in the above model vehicles that the engine cannot be started when the engine is hot but will start after the engine has
cooled and there are no Diagnostic Trouble Codes stored in the ME control unit, check the signal to the fuel pump relay from the ME Control unit
(12VDC with Key in position "1" N3/10 pin 17 + and pin 4). If no signal is found, check the wiring from the ME control unit to the fuel pump relay. If
the wiring checks out, it may be due to an open circuit in the ME control unit. In this case, replace the ME control unit and retest the signal to the fuel
pump relay. Refer to EPCnet for applicable part number.
Note:
A copy of the short test and all tests performed must accompany returned parts. If the documentation is missing or does not support the diagnosis, the
warranty claim may be debited.
Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on
February 11, 2009. Please refer to Netstar --> Star TekInfo --> Star Time for the most current labor time allowance.