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TSB 18-037-07 REV. A

68RFE Transmission - DTC P0868 Low Line Pressure

Visit Geno's Garage for Truck accessories.

Date: July 20, 2007 

THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-037-07, DATED MAY 25, 2007, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE A CHANGE TO THE IGNITION SWITCH POSITION WHEN PERFORMING SECTION A - TCM CIRCUIT TEST.

THE StarSCAN FLASH FILES FOR THIS BULLETIN ARE AVAILABLE VIA THE INTERNET.

Models: 2007 (DH/D1) Ram Truck (2500/3500)

NOTE: This bulletin applies to vehicles equipped with a 68RFE automatic transmission
(sale code DG7) built on or before April 30, 2007 (MDH 0430xx).

Overview:
This bulletin involves checking the Transmission Control Module (TCM) to determine that it
is in proper working order and then selectively erasing and reprogramming the TCM with new software.

Symptom/Condition:
The customer may experience a Malfunction Indicator Lamp (MIL) illumination due to
Diagnostic Trouble Code (DTC) P0868 - Low Line Pressure

This condition may be due to the Transmission Control Module UCM)
software or to a hardware circuit in the TCM.

Diagnosis:
Using a StarSCAN with the appropriate Diagnostic Procedures available in
TechCONNECT, verify all engine systems are functioning as designed. If DTCs
are present record them on the repair order and repair as necessary before
proceeding further with this bulletin.

If the vehicle operator describes or experiences the Symptom/Condition, perform the Repair Procedure.

Parts Required:

Qty.	Part No.	Description
1	04275086AB	Label, Authorized Modification

Special Tools/Equipment Required:

Repair Procedure: 

SECTION A - TCM CIRCUIT CHECK:

1.	Turn the ignition switch to the '* "LOCK" '* position and remove the ignition key from the ignition switch.
2.	Disconnect and isolate the negative battery cable from the battery negative terminal.
3.	Locate the TCM in the rear of the engine compartment.
4.	Disconnect the "D" (green) electrical harness connector from the TCM. The "D" connector will have a green color strips to identify it.
5.	Install special tool 8815-1 (Adapter) to the TCM "D" connector. Connect the harness "D" connector to the 8815-1 Adapter.
6.	Install special tool 8815 (PCM Diagnostic Pinout Box) to the 8815-1 Adapter.
7.	Connect the negative battery cable to the battery.
8.	Turn the ignition switch to the ** "OFF" ** position (the first detent clockwise from the **"LOCK"** position). DO NOT turn the ignition switch to the "ON/RUN"' position, this will cause an incorrect voltage reading to be obtain when testing.
NOTE: Verify that the ignition switch is in the **"OFF"** position and NOT in the "ON/RUN" position. The following steps must be followed in order.
9.	Check of the D19 circuit. a. Set the DVOM to DC voltage. Adjust the DC volts to the appropriate setting to     correctly read 12 volts. b. Install the two leads of a known GOOD DVOM (Digital Volt Ohm Meter) to pins 13     and 19 of the 8815 Pinout Box. Install the negative lead of the DVOM in pin 13,     and the positive lead of the DVOM in pin 19. c. Pins 13 and 19 of the 8815 Pinout Box should connect to D13 (C) volts - ground) and     to pins D19 (12 volts - switched battery voltage) of the TCM. d. Does the VOLT meter read 12 volts? e. If YES, then proceed to the next step. f. If NO, then further diagnosis of the circuit is required.
10.	Check for a voltage difference between circuit D11 and D19: a. Install the two leads of a known GOOD DVOM (Digital Volt Ohm Meter) to pins 11     and 19 of the 8815 Pinout Box. Install the negative lead of the DVOM in pin 11,     and the positive lead of the DVOM in pin 19. b. Pins 11 and 19 of the 8815 Pinout Box should connect to pins D11 (12 volts - driver     output voltage) and to D19 (12 volts - switched battery voltage) of the TCM. c. The VOLT meter should read LESS THAN 2 volts. There should not be more     than a 2 volt difference between the two circuits (D11 and D19). d. If the volt meter reading is LESS THAN 2 volts, then proceed to Section B -     Reprogram (Flash) The TCM. e. If the volt meter reading is GREATER THAN 2 volts, then proceed to the next step.
11.	Turn the ignition switch to the **"LOCK"** position and remove the ignition key from the ignition switch.
12.	Disconnect and isolate the negative battery cable from the battery negative terminal.
13.	Disconnect the electrical harness "D" connector from the 8815-1 Adapter. The 3815-1 Adapter should now be connected only to the "D" connector of the TCM and to the 8815 Pinout Box.
14.	Check for the resistance between circuit D11 and D13 in the TCM: a. Install the two leads of a known GOOD DVOM (Digital Volt Ohm Meter) to pins 11     and 13 of the 8815 Pinout Box. For this resistance test there is no     difference/concern which lead of the DVOM is connected to which pin (11 or 13) b. Set the DVOM to OHM'S. Adjust the ohm meter to the appropriate setting to     correctly read 100,000 ohm (same as 100K ohm) resistance. c. Pins 11 and 13 of the 8815 Pinout Box should connect to pins D11 and to D13 of     the TCM for this resistance test. d. For this test, if the circuit is good, the OHM meter should read GREATER THAN     100,000 ohm resistance (100K ohm). There should not be less than a 100,000 ohm      resistance between the two circuits (D11 and D13). If the circuit is good, the      technician will probably read a resistance of about 2,000,000 ohm (same as 2M      ohm), significantly higher than the 100,000 ohm (100K ohm) cut point. e. If the ohm meter reading is GREATER THAN 100,000 ohm (100K ohm) resistance,     then the TCM is good. Proceed to Section B - Reprogram (Flash) The TCM. f. If ohm meter reading is LESS THAN 100,000 ohm (100K ohm) resistance, then the    TCM is bad (circuit is shorted). Replace the TCM. If a new TCM is required, make    sure the TCM software is at the latest revision level.
15.	Connect the negative battery cable to the battery.
NOTE: Additional circuit analysis and the replacement of the TCM under warranty is not addressed by this Service Bulletin and if required would be claimed separate to this bulletin.

SECTION B - REPROGRAM (FLASH) TCM - USING StarSCAN AND THE INTERNET TO RETRIEVE THE FLASH FILE:

NOTE: Before performing this Repair Procedure, the operating software in the
StarSCAN must be programmed with software release level 8.01 or higher.
The software release level is visible in the blue header at the top of the StarSCAN screen.

NOTE: The StarSCAN diagnostic scan tool fully supports Internet connectivity.
However, to take advantage of this feature you must first configure the StarSCAN
for your dealership's network. For instruction on setting up your StarSCAN for the
dealer's network refer to either:
"DealerCONNECT > Service > StarSCAN and StarMOBILE tools > Online Documentation",
or refer to the StarSCAN Quick Start Networking Guide. The StarSCAN Quick Start
Networking Guide is also available on the www.dectools.com website under the "Download Center".

NOTE: If this flash process is interrupted/aborted, the flash should be restarted.

1.	Open the hood and install a battery charger. Using a voltmeter, verify that the charging rate provides 13.2 - 13.5 volts. Set the battery charger to continuous charge. Do not allow the charger to time out during the flash process. Remove the charger from the battery when the flash process is complete.
NOTE: Do not allow the charging voltage to climb above 13.5 volts during the flash process.
2.	Connect the CH9410 StarSCAN ethernet cable to the StarSCAN and the dealer's network drop.
3.	Connect the CH9404 StarSCAN vehicle cable to the StarSCAN and the vehicle.
4.	Power ON the StarSCAN.
5.	Retrieve the old ECU part number. Using the StarSCAN at the "Home" screen:     a. Select "ECU View"     b. Touch the screen to highlight the TCM in the list of modules.     c. Select "More Options".     d. Select "ECU Flash".     e. Record the part number at the top of the "Flash TCM" screen for later reference.     f. Select "Browse for New File". Follow the on screen instructions.     g. Select "Download to Scantool".     h. Select "Close" after the download is complete, then select "Back".     i. Highlight the listed calibration.     j. Select "Update Controller".     k. When the update is complete, select "OK".
NOTE: Due to the ECU (TCM) programming procedure, a DTC may be set in other modules within the vehicle, if so equipped. Some DTC's may cause the MIL to illuminate. From the "Home" screen select "System View,". Then select "All DTCS". Press "Clear All Stored DTCS" if there are any DTCs shown on the list.
NOTE- The following step is required by law when reprogramming a PCM or TCM.
6.	Type the necessary information on the "Authorized Modification Label" p/n 04275086AB and attach near the VECI label (Fig. 1).
	FIGURE 1 - AUTHORIZED MODIFICATION LABEL 1 - POWERTRAIN CONTROL MODULE P/N (INSERT P/N) USED 2 - CHANGE AUTHORITY: TSB XX-XXX-XX 3 - DEALER CODE: XXXXX 4 - DATE: XX-XX-XX

Policy:    Reimbursable within the provisions of the warranty.

Time Allowance:

Failure Code:

This page was edited on: February 21, 2008