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TSB 18-003-04

Flash: Poor A/C Performance, Slow Fuel Gauge Response, and
Diagnostic Trouble Codes (DTC’s) P0341 and P1757

Visit Geno's Garage for Truck accessories.

Date: February 3, 2004

THIS BULLETIN SUPERSEDES SERVICE BULLETIN 18-043-03 DATED DECEMBER 5, 2003, WHICH SHOULD BE REMOVED FROM YOUR FILES.

Models: 2003 - 2004 (DR) Ram Truck

NOTE: This bulletin applies to DR vehicles equipped with a Cummins Turbo Diesel engine (sales code ETC or ETH), with an engine serial number 57130284 or earlier (Figure 1); and the engine date of manufacture on or before December 10, 2003.

Overview:
This bulletin involves erasing and reprogramming the Cummins ECM with new software.

Symptom/Condition:
Vehicle operator may describe:

• Slow fuel gauge response after adding fuel.
• On California emission equipped vehicles (sales code NAE); rapid A/C clutch cycling and poor A/C performance until coolant temperatures reach 76.6° C. (170° F.)

On 2003 vehicles, the technician may find DTC P0341 - Camshaft Position (CMP) Sensor Signal.

On 2004 vehicles equipped with a 48RE Automatic transmission (sale code DG8), the technician may find DTC P1757 - Gov Press Above 3 PSI In Gear With 0 MPH.

The new engine controller software also includes a change to the engine coolant temperature set point from 79.4° C to 83.3° C (175° F to 182° F) for 2003 late build and 2004 engines at which the exhaust brake (Mopar accessory) is turned off when the vehicle is stationary and the engine is idling.

Diagnosis:
Using a Scan Tool (DRBIIIT) with the appropriate Diagnostic Procedures Manual, verify all engine systems are functioning as designed. If DTCs are present, other than the one above, record them on the repair order and repair as necessary before proceeding further with this bulletin.

Parts Required:

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

Special Tools/Equipment Required:

NOTE: An updated J1962 cable has been released. This cable has a red colored connector at the DRBIIIT connection. Use this cable whenever a flash is being performed.

Repair Procedure: 

NOTE: Whenever a controller is programmed, the software in the DRBIII must be programmed with the latest revision level available.

NOTE: If this flash process is interrupted/aborted, the flash should be restarted and then follow the directions on the DRBIII.

Most owners do not have access to the software and equipment required to program the ECM. To see the specific instructions, download the pdf version.

NOTE: Due to the PCM programming procedure, a DTC may be set in other modules (TCM, BCM, MIC, SKIM, etc.) within the vehicle, if so equipped. Some DTC’s may cause the MIL to illuminate. Check all modules using “Module Scan”, record the DTC’s, and erase these DTC’s prior to returning the vehicle to the customer. Erase any DTC’s in the PCM only after all other modules have had their DTC’s erased.

NOTE: The following step is required by law.

Type the necessary information on the 'Authorized Modification Label" p/n 04275086AB and attach near the VECI label (Fig. 2).

FIGURE 2 - AUTHORIZED MODIFICATION LABEL 1 - ENGINE 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: May 3, 2004