XJ-6 L6-4.0L (1991)
Radio/Stereo: All Technical Service Bulletins
Radio - Interference Noise
86-92
Radio Interference Noise Due
To Fuel lnjector Pulse
MODEL
1991 MY Sedans
DATE 6/91
ISSUE:
"Ticking" interference noise on the AM radio band.
ACTION:
Diagnose the possibility that AM radio interference is related to fuel injector pulse noise by using the following procedure:
NOTE:
Interference caused by fuel injector pulse changes with engine speed and load.
^
Tune the radio to the AM station where the interference is strongest.
^
Drive the vehicle at approximately 35 mph. (Engine speed must be above 1500 rpm).
^
Depress the throttle heavily and determine if the interference noise increases. Release the throttle and determine if the noise stops during
deceleration fuel cut-off, until fueling reinstatement occurs at 1100 rpm.
If the interference noise does NOT respond to changes in throttle, the problem is NOT fuel injector pulse related. Refer to Technical Bulletins 86-50 and
86-82.
If the interference noise does respond directly with engine speed and load, re-route the gearbox harness as follows:
^
Remove the ski-slope, radio, and climate control/clock panel.
^
Remove the right side A/C support bracket.
^
Disconnect the following gear-box connectors:
-
GB-1 15 Way Brown PMHD
-
GB-2 12 Way Black Multi-Lock
-
GB-3 6 Way White Simitomo
-
LB-35 14 Way Yellow Multi-Lock
-
GBG-1 Ground Eyelet
