GDI ± Troubleshooting
13A-88
IGNITION COIL AND POWER TRANSISTOR
Power transistor control signal
Measurement Method
1. Disconnect the ignition coil connector, and connect the
special tool (test harness: MB991658) in between. (All
terminals should be connected.)
2. Connect the analyzer special patterns pickup to terminal
3 of each ignition coil connector in turn.
Alternate Method (Test harness not available)
1. Connect the analyzer special patterns pickup to
engine-ECU terminal 3 (No. 1 ignition coil), terminal 13
(No. 2 ignition coil), terminal 12(No. 3 ignition coil), terminal
4 (No. 4 ignition coil) respectively.
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
sensor output
wave pattern
Power transistor
control signal
wave pattern
(V)
Compression top dead center
θ: Spark advance angle
Ignition period
OFF
Dwell section
Time
θ
T
4
0
0
T: Crank angle
T1
ON
T1: Time calculated by engine-ECU
Special
patterns
pickup
Analyzer
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