TROUBLESHOOTING AND ELECTRICAL SYSTEM
(GASOLINE VEHICLE)
Test Procedures
19
TEST PROCEDURE 14 – Ignition Coil
See General Warnings on page 1-2.
The following test procedures will properly detect a coil that has failed in most cases; in rare cases however, some
ignition coils can fail to operate at normal (warmer) operating temperatures. If the ignition coil has tested okay in
the vehicle and on the bench, but fails to operate reliably, replace the coil with a known good coil and operate the
engine for several minutes to ensure that the coil functions at normal operating temperature. If the new coil functions
properly, keep the new coil in the circuit.
NOTE:
An analog ohm meter set to the x1K scale must be used for this test. A digital ohm meter will not provide
the correct results.
Resistance value ranges given in these tests reflect a tolerance of ±40%.
Please note that these values are rough standard and it is impossible to reach an exact conclusion with
the resistance reading.
Ignition Coil – In Vehicle Test
1.
Disconnect battery and spark plug wire(s).
See Disconnecting the Battery – Gasoline Vehicles, Section
2.
Using an analog multimeter set to x1k ohms, measure the primary coil resistance.
2.1. Disconnect the bullet terminal at the front of the engine
. Place the red (+) probe
of the meter on the male bullet terminal of the wire connecting to the ignition coil under the fan housing, and
place the black (–) probe on a clean unpainted surface of the engine or frame
.
2.2. If the resistance is not between 5.5k to 12.7k ohms, bench test the ignition coil.
V
V
A
x10
x1
0
0
30
15
0
30
300
300
30
600
x100
x1k
600
OFF
1
1. x1K Ohm Setting
2647
Figure 19-23
Primary Coil Resistance – In Vehicle Test
2014 Precedent
®
Golf Car Maintenance and Service Manual
Page 19-25
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