MPI <4G1> -
Troubleshooting
13A-77
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 wave pattern build-up section and maximum
voltage
Probable cause
Rises from approx. 2 V to approx. 4.5 V at the top-right
Normal
2 V rectangular wave
Open-circuit in ignition primary circuit
Rectangular wave at power voltage
Power transistor malfunction
Examples of Abnormal Wave Pattern
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 2 V 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
2 V
--- Normal wave pattern
V
B
Содержание Colt 2000
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