Wagoneer L6-242 4.0L VIN L FI (1989)
Powertrain Control Module: Customer Interest
Radio - Poor Reception/Static/Noise on FM Band
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:
