Trans. In Limp-Home Mode Or Harsh Engagement After Programming / SCN Coding (LI27.00-P-044922)

Publication date: 2009-01-15
Reference number: LI27.00-P-044922
Supersedes refnos: 27.00/96

TRANS. IN LIMP-HOME MODE OR HARSH ENGAGEMENT AFTER PROGRAMMING / SCN CODING

TECHNICAL SERVICE BULLETIN

Reference Number(s): LI27.00-P-044922 Version 1 (T-B-27.00/96, March 29, 2007), Date of Issue: January 15, 2009

Mercedes-Benz:	All Light Truck Vehicles Equipped with Transmission 722.9
Design Group:	27.00 General
Reason For Change:

COMPLAINT

Trans. in Limp-Home Mode or Harsh Engagement After Programming

CAUSE

If a vehicle equipped with a 722.9 transmission goes into limp-home mode after performing SCN coding and/or programming of the transmission control module; or if after performing these actions the transmission engages harshly, there can be two causes for this issue.

Scan the transmission control module for the below fault / event codes.

Event Codes: 0602, 1644, 2010 and / or 2011

Cause 1: SCN coding was not accepted by the transmission control module. This condition can be confirmed by looking at the following menu within the transmission control module: Transmission Control Modue -> Control Unit adaptations -> SCN Coding -> Display of coding data

Cause 2: The coding was accepted by the transmission control module, but the vehicle is in limp home mode due to the presence of the stored fault and/or event codes.

REMEDY

NOTE: Do not perform a road test! This may cause transmission damage.

Remedy 1: If the coding reads "NO VALUE", the transmission control module must be recoded again until it is confirmed that the coding has been accepted by the transmission control module. This is confirmed when a four digit code is displayed as a coding value.

Remedy 2: In this case, simply erase the stored codes.

NOTE: The following allowable labor operations should be used when submitting a warranty claim for this repair.

SYMPTOMS

Automatic transmission / Power transmission / Automatic transmission - function / Limp-home mode /

Automatic transmission / Power transmission / Automatic transmission - function / Engaging process /

CONTROL UNIT/FAULT CODE

Control unit	Fault code	Fault text
ETC-Electronic transmission control (EGS2) (M (164),R (251),GL (164),G (463))	1644	Event: The variant coding of component Y3/8n4 (Fully integrated transmission control (VGS) control unit) is implausible or no coding. ([VGS3_*])
ETC-Electronic transmission control (EGS2) (M (164),R (251),GL (164),G (463))	2011	Event: Invalid control module version ([VGS_*])
ETC-Electronic transmission control (EGS2) (M (164),R (251),GL (164),G (463))	0602	Event: Control module Y3/8n4 (Fully integrated transmission control (VGS) control unit) is not coded. ([VGS3_*])
ETC-Electronic transmission control (EGS2) (M (164),R (251),GL (164),G (463))	1644	Event: The variant coding of component Y3/8n4 (Fully integrated transmission control (VGS) control unit) is implausible or no coding. ([VGS2_*])
ETC-Electronic transmission control (EGS2) (M (164),R (251),GL (164),G (463))	0602	Event: Control module Y3/8n4 (Fully integrated transmission control (VGS) control unit) is not coded. ([VGS2_*])
ETC-Electronic transmission control (EGS2) (M (164),R (251),GL (164),G (463))	2010	Event: Control module Y3/8n4 (Fully integrated transmission control (VGS) control unit) is not coded. ([VGS_*])

WORK UNITS

Op. no.	Operation text	Time	Damage code	Note
54-1011	SHORT TEST, PERFORM	0.3 hrs.	54553 81	Model Indicators: BA, BB, BC, BD, EA, EB, Z1, Z2, Z3, Z4
54-0992	CONTROL UNIT CODE.(AFTER SHORT TEST), PERFORM	0.1 hrs.		Model Indicators: BA, BB, BC, BD, EA, EB, Z1, Z2, Z3, Z4