Tempo L4-122 2.0L DSL (1984)
Replace antenna cable if required.
AM NOISE SYMPTOM
^
Variable frequency oscillation or hash that is heard with engine off
SOURCE:
Electronic instrumentation or module
POTENTIAL CAUSE
CORRECTIVE ACTION
Antenna system defective
Perform antenna system check.
Replace antenna cable if required.
Defective electronic instru-
Remove fuses one-by-one from
mentation
fuse panel, until the offending
power feed buss is identified Consult the troubleshooting manual and identify modules fed from the offending power
buss Disconnect these modules one-byone until the noisy unit is isolated Install substitute module
AM NOISE SYMPTOM
^
Popping noise that varies with engine speed
^
Not present with engine off
^
Does not vary with addition of electrical loads (headlight, rear defroster)
^
Not present at minimum volume
SOURCE:
Ignition system
POTENTIAL CAUSE
CORRECTIVE ACTION
Antenna system defective
Perform antenna system check.
Replace antenna cable if required.
Loose spark plug or coil wire
Seat all spark plug and coil wires
Radio A-line filtering defective
Power radio directly from separate
battery. If noise is not present, replace radio.
Improper cable attachments
Check attachment of battery
cables at posts and battery around cable at engine block. Check attachment of other ground cables. Clean terminals and
mounting surfaces. Torque attaching hardware to specification.
AM NOISE SYMPTOM
^
A whine that varies with engine RPM and electrical loads. Noise not heard with engine off or voltage regulator disconnected.
SOURCE:
Charging System
POTENTIAL CAUSE
CORRECTIVE ACTION
Antenna system defective
Perform antenna system check.
Replace antenna cable if required.
Radio A-line filtering defective Power radio directly from separate
battery. If noise is not present, replace radio.
Defective voltage regulator
Replace voltage regulator capa-
capacitor
citor, if vehicle is equipped with
one.
Defective Voltage Regulator
Replace voltage regulator
Defective alternator
Replace alternator
Low battery charge condition
Charge or replace as required.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: "INFORMATION ONLY