Inspect Power Source Line; Inspect Ignition Coil Ground; Replace Ignition Coil - Toyota 7M-GE Repair Manual

IG-14 IGNITION.SYSTEM
- On-Vehicle Inspection (7M-GTE)
INSPECTIoN OF IGNlTlOhi COIL-
1. INSPECT POWER SOURCE LINE
(a) Disconnect the high-tension cord from the ignition
coil.
(b) Disconnect the ignition coil connectors.
(c) Turn the ignition switch ON,
Voltmeter
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(d) Using a voltmeter, measure the voltage between ter-
minal 1 and body ground.
Voltage: Approx. 12 V
2. INSPECT PRIMARY COIL RESISTANCE
Using an ohmmeter, measure the resistance between the
positive (+I and negative (-1 terminals.
Primary coil resistance (cold): 0.3 - 0.5 R
NOTE: Because is inside the coil, it is impossible to
measure secondary coil resistance.
3. INSPECT IGNITION COIL GROUND
Using an ohmmeter, check that there is no continuity be-
tween the ignition coil terminal and body ground.
4. IF NECESSARY, REPLACE IGNITION COIL
Using a hexagon key wrench 3 mm (0.12 in.), replace the
ignition coil.