Toyota 3S-GE Repair Manual page 424

'G-4 IGNITION SYSTEM — PRECAUTION
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PRECAUTION
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Do not leave the ignition switch ON for more than
10 minutes if the engine does not start.
With a tachometer connected to the system. con-
nect the tester probe of the tachometer to terminal
IGG) of the check connector.
SW20 only:
With a tachometer connected to the system, con-
nect the power source probe of the tachometer to
service terminal +B of the engine compartment
relay box.
As some tachometers are not compatible with this
ignition system, we recommend that you confirm
the compatibility of your unit before use.
Never allow the tachometer terminals to touch
ground as it could result in damage to the igniter
and/or ignition coil.
Do not disconnect the battery while the engine is
running.
Check that the igniter is properly grounded to the
body.