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TSB 08-18-00

Radio Interference to/from two-way Radio Receivers

Visit Geno's Garage for Truck accessories.

Date: December 17, 1999

1997-2000    (AN)        Dakota
1998-2001    (BR/BE)  Ram Truck

Symptom/Condition

Customers may complain of intermittent poor reception on their two-way radios.

NOTE:    This condition does not affect the operation of any AM or FM band radio.

Discussion:

Radio receivers from aprox 20 MHz to 174 MHz may be susceptible to RFI from the fuel pump module's motor.

The following services are within this band:

• 27 MHz CB
• 10M ham Radio
• Public service VHF low band (30 - 50 Mhz)
• 6M ham radio (50 - 54 Mhz)
• VHF aircraft (118 - 136 Mhz)
• 2M ham radio (144 - 148 Mhz)
• Public service VHF hi band (148 - 174 Mhz)

 diagnosis:
 Turn ignition key to the run position. Operate the two-way radio and monitor for RFI/static/poor reception. If RFI is present with key in run position, RFI is being emitted by something other than the fuel pump module's motor. Start the engine and monitor for RFI.  If RFI is identified only with the engine running, perform the following repair.

NOTE: IT IS IMPORTANT TO IDENTIFY WHICH COMPONENTS ARE EMITTING RFI. AFTER A REPAIR HAS BEEN MADE, PERFORM THE DIAGNOSIS AGAIN TO IDENTIFY IF ANY OTHER COMPONENT IS PRODUCING RFI. SOME VEHICLES MAY REQUIRE ADDITIONAL DIAGNOSIS.

Parts:

1              04883825AD   filter, RFI ,  for fuel pump module
AR (1)     04318028        Tape, foam
AR (1)     04856503        Strap, tie

Repair:    This bulletin involves installing an RFI filter in series with the fuel pump.

1. Disconnect and isolate the battery negative cable.
2. Disconnect the fuel pump module connector at the fuel pump module. The connector has a locking tab that must be released prior to disconnecting. Depress the lock tab and slide the connector apart.
3. Connect the RFI module to the harness and to the fuel pump module connector. Secure the connectors by sliding the red lock tab back into its original position.
4. Apply foam tape to the back of the RFI module.
5. Secure the RFI module by tie strapping it to the truss bracket. The truss bracket is adjacent to the fuel tank rail and chassis rail.
6. Connect the negative cable.

notes:

Policy:  Reimbursable within the provisions of the warranty.

Time Allowance
Labor Operation Number:     08-90-65-91   . . . . . . . 0.2 Hrs.

Failure Code:     P8 - New Part

This is a re-do of   TSB 08-21-98 but adding the Ram model years and the Dakota. The filter part number is changed. RFI filters for other parts of the Ram are listed at $200-$300.  This TSB is reimbursable within provisions of the warranty.

This page was edited on: May 3, 2004