Montero LS 4WD V6-2972cc 3.0L SOHC 12 Valve (1994)
Wave pattern observation points:
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Rectangular wave of approx. 2 V caused by open circuit in ignition primary circuit.
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Rectangular wave at power voltage caused by malfunction of ignition power transistor.
Examples of Abnormal Wave Patterns
Wave pattern during engine cranking
Problem: Open circuit in ignition primary circuit
Wave pattern characteristics: Top-right part of the build-up section cannot be seen, and voltage value is approximately 2 V too low.
Wave pattern during engine cranking
Problem: Malfunction of ignition power transistor
Wave pattern characteristics: Power voltage (9-10 Volts) results when the ignition power transistor is on.
