|
|
MPI - Troubleshooting 13A-123 IGNITION COIL AND POWER TRANSISTOR Ignition coil primary signal Refer to GROUP 16 - Ignition system. D Power transistor control signal Measurement Method special tool (test harness: MB991658) in between. (All terminals should be connected.) 2. Connect the analyzer special patterns pickup to terminal No. 3 of each ignition coil connector in turn. Alternate Method (Test harness not available) engine-ECU terminal No. 10 (No. 1 - No. 4), terminal No. 23 (No. 2 - No. 3) respectively. Standard Wave Pattern Function Special patterns Pattern height Low Pattern selector Display Engine r/min Approximately 1,200 r/min Standard wave pattern Crank angle sensor output wave pattern Power transistor control signal wave pattern (V) 75_BTDC 5_BTDC T: Revolution time corresponding to a crank angle of 180_ Compression top dead center θ: Spark advance angle Ignition period OFF ON Dwell section T1: Time computed by the engine-ECU Time θ T1 T 6 4 2 0 4 2 0 Special patterns pickup Analyzer |