Grand Cherokee 4WD L6-242 4.0L VIN S MFI (1993)
Ignition Coil: All Technical Service Bulletins
Ignition Coil Polarity - Information
NO.: 08-29-92
GROUP: Electrical
DATE: Dec. 14, 1992
SUBJECT:
Ignition Coil Polarity
MODELS:
1993 (ZJ) Grand Cherokee/Grand Wagoneer
DISCUSSION:
Ignition coil polarity with today's high output ignition systems is not critical to engine performance. Some vehicles built before October 1, 1992, may
display an oscilloscope pattern indicating reversed polarity. This condition is normal and attempts to repair it should not be made.
POLICY: Information Only
