Montero Sport V6-3.5L SOHC (2004)
3. Connect the oscilloscope probe to PCM terminal No. 13. (When checking the number 2 and 5 cylinders.)
Wave Pattern Observation Points
Point: Condition of wave pattern build-up section and maximum voltage (Refer to abnormal wave pattern examples 1 and 2.)
Examples of Abnormal Wave Patterns
Example 1 (Wave pattern during engine cranking)
Cause of 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 volts too low.
Example 2 (Wave pattern during engine cranking)
Cause of problem
-
Malfunction in ignition power transistor
Wave pattern characteristics
-
Power voltage results when the ignition power transistor is ON.
