Montero 4WD V6-3.5L SOHC (1998)
Air Flow Meter/Sensor: Oscilloscope Patterns and Waveforms
Wave Pattern Inspection Using an Analyzer
Measurement method:
(1) Disconnect the volume air flow sensor connector, and connect the special tool (test harness: MB991348) in between. (All terminals should be
connected.)
(2) Connect the analyzer special patterns pickup to terminal (3) of the volume air flow sensor connector.
Alternative method (when test harness is not available):
Connect the analyzer special patterns pickup to ECM terminal (90).
Standard wave pattern:
Observation conditions
Wave Pattern
Observation conditions:
Observation conditions (Pattern changes with engine speed changes)
Wave pattern observation points:
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:
