Primary Coil Resistance Tests

Disconnect ignition coil so it is isolated from remainder of system. Using ohmmeter, measure resistance between coil positive (+) and negative (-) terminals. See Fig 1 or Fig 2.
If primary resistance is not within specification, replace ignition coil. See IGNITION COIL RESISTANCE table. If resistance is within specification, proceed to SECONDARY COIL RESISTANCE.

Fig 1: Testing 4WD (4A-FE) Ignition Coil Primary Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Testing 2WD (4A-GE) Ignition Coil Primary Resistance

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IGNITION COIL RESISTANCE ⁽¹⁾

Application

Primary Ohms

Secondary Ohms

4WD 4A-FE

.30-.50

7700-10,400

2WD 4A-GE

.40-.50

10,200-13,800

⁽¹⁾	Check at room temperature.