Radio - Poor Reception/Static/Noise on FM Band

89amcjeep12

Models

1987, 1988, 1989 MJ, XJ, & BB Bodies


Subject

Radio-Static, Noisy Stations or Poor Reception on FM Band (88-108 MHZ) Only


Index

ELECTRICAL


Date December 11, 1989


No.

08-60-89

(C08-20-9)

P-4292
BODY CODE LEGEND

MJ - COMANCHE XJ - CHEROKEE/WAGONEER BB - EAGLE PREMIER


SYMPTOM/CONDITION

Poor radio reception, noisy stations or static (may be variable with engine speed) when equipped with 4.0L engine (Jeep) or 3.0L engine (Premier) and factory-installed radio (FM band only). This condition is most evident in low radio signal strength areas such as, hilly/mountainous terrain and distances greater than 35 miles from the transmitter. This condition may not be the fault of the radio.

SERVICE DIAGNOSIS

This bulletin will only address interference (static) that is being generated by the ECU. Before replacing the ECU it is necessary to verify that the ECU is the likely cause of the problem. To verify that the condition exists, operate the radio with the engine running. If the static is present, turn the engine off and operate the radio with the ignition switch in the accessory position. If the static is now gone, it may be generated by the ECU. If the static is still present, it is being generated from another source and replacing the ECU will not correct the problem. Refer to the service manual for diagnostics.
PARTS REQUIRED

MJ & XJ

1 Engine Control Unit (Automatic Transmission) P/N 53007842
1 Engine Control Unit (Manual Transmission) P/N 53007843

BB

1 Engine Control Unit (Automatic Transmission) P/N 4605001

REPAIR PROCEDURE

This procedure involves testing the radio and replacing the Engine Control Unit (ECU).

1. Using the appropriate service manual, verify that the radio is performing properly.

2. Replace the Engine Control Unit (ECU) with appropriate (ECU) listed in this bulletin. Use the replacement procedure referenced in the correct model year service manual.

3. Verify proper operation.


POLICY: Reimbursable within the provisions of the warranty.


TIME ALLOWANCE:
Labor Operation No. 08-15-62-92 . . . . . . . . . . . . . . 0.4 Hrs.
(W)

08-15-62-92 . . . . . . . . . . . . . . 0.3 Hrs.
(P)


FAILURE CODE: 58 - Internal Defect