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MPI <4G9> – Troubleshooting 13C-94 IGNITION COIL AND POWER TRANSISTOR D Ignition coil primary signal D Power transistor control signal Measurement Method 1. Disconnect the ignition coil connector, and connect the 2. Connect the analyzer special patterns pickup to terminal Alternate Method (Test harness not available) 1. Connect the analyzer special patterns pickup to Standard Wave Pattern Observation condition Function Special patterns Pattern height Low Pattern selector Display Engine r/min Approx. 1,200 r/min Standard wave pattern Crank angle Power transistor (V) 75 _ BTDC 5 _ BTDC Compression top dead center Ignition period OFF ON Dwell section T :Crank angle θ : Spark advance angle (ms) θ T1 T 6 4 2 0 4 2 0 Special Analyzer |