Montero V6-3.8L SOHC (2005)
1. Connect the oscilloscope probe to PCM terminal No.63.
Observation condition
Rev engine, observe T1 and T2 remain equal.
Wave Pattern Observation Points
1. Check that cycle time T becomes shorter and the frequency increases when the engine speed is increased.
Examples of Abnormal Wave Patterns
Example 1
Cause of problem
-
Sensor interface malfunction.
Wave pattern characteristics
-
Rectangular wave pattern is output even when the engine is not started.
Example 2
Cause of problem
-
Damaged rectifier or vortex generation column.
Wave pattern characteristics
-
Unstable wave pattern with non-uniform frequency. An ignition leak will distort the wave pattern temporarily, even if the volume airflow sensor is
normal.
