Ignition Coil Test - Jeep Wrangler 1999 Electronic Service Manual

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DESCRIPTION AND OPERATION (Continued)
On vehicles equipped with an automatic transmis-
sion, a cable connects an interlock device within the
steering column assembly to the transmission floor
shift lever. This interlock device is used to lock the
transmission shifter in the PARK position when the
key is in the LOCKED or ACCESSORY position. The
interlock device is not serviceable. If repair is neces-
sary, the steering column assembly must be replaced.
Refer to Group 19, Steering for procedures. The
shifter interlock cable can be adjusted or replaced.
Refer to Group 21, Transmissions for procedures.
On vehicles equipped with a manual transmission,
a lever is located on the steering column behind the
ignition key lock cylinder. The lever must be operated
to allow rotation of the ignition key lock cylinder. The
lever mechanism is not serviced separately. If repair
is necessary, the steering column assembly must be
replaced. Refer to Group 19, Steering for procedures.
DIAGNOSIS AND TESTING
AUTOMATIC SHUTDOWN (ASD) RELAY TEST
To perform a complete test of this relay and its cir-
cuitry, refer to the DRB scan tool. Also refer to the
appropriate Powertrain Diagnostics Procedures man-
ual. To test the relay only, refer to Relays—Opera-
tion/Testing in the Group 14, Fuel Systems section.

IGNITION COIL TEST

To perform a complete test of the ignition coil and
its circuitry, refer to the DRB scan tool. Also refer to
the appropriate Powertrain Diagnostics Procedures
manual. To test the coil only, refer to the following:
The ignition coil (Fig. 9) or (Fig. 10) is designed to
operate without an external ballast resistor.
Inspect the ignition coil for arcing. Test the coil
according to coil tester manufacturer's instructions.
Test the coil primary and secondary resistance.
Replace any coil that does not meet specifications.
Refer to the IGNITION COIL RESISTANCE chart.
COIL MANUFACTURER
Diamond
Toyodenso
IGNITION COIL RESISTANCE
PRIMARY RESISTANCE
21-27°C (70-80°F)
0.97 - 1.18 Ohms
0.95 - 1.20 Ohms
IGNITION SYSTEM
Fig. 9 Ignition Coil—2.5L Engine
Fig. 10 Ignition Coil—4.0L Engine
SECONDARY RESISTANCE
21-27°C (70-80°F)
11,300 - 15,300 Ohms
11,300 - 13,300 Ohms
8D - 5