GDI ± Troubleshooting
13A-89
Wave Pattern Observation Points
Point: Condition of wave pattern build-up section and maximum voltage (Refer to abnormal wave pattern
examples 1 and 2.)
Condition of wave pattern build-up section and maximum voltage Probable cause
Rises from approx. 2V to approx. 4.5V at the top-right Normal
2V rectangular wave Open-circuit in ignition primary circuit
Rectangular wave at power voltage Power transistor malfunction
Examples of Abnormal Wave Patterns
D Example 1
Wave pattern during engine cranking
Cause of problem
Open-circuit in ignition primary circuit
Wave pattern characteristics
Top-right part of the build-up section cannot be seen, and
voltage value is approximately 2V too low.
D Example 2
Wave pattern during engine cranking
Cause of problem
Malfunction in power transistor
Wave pattern characteristics
Power voltage results when the power transistor is ON.
--- Normal wave pattern
2V
V
B
--- Normal wave pattern
To Next Page
Loading...
