Oscilloscope Patterns and Waveforms

EVALUATION OF IGNITION VOLTAGE SPIKE WHEN ACCELERATOR APPLIED SUDDENLY:




1. Start of attenuation process is not significantly higher than the ignition voltage spike.
Injection system OK.

2. Start of attenuation process is significantly higher than the ignition voltage spike.
Fault in the injection system:
a. Lean fuel mixture
B. Defective injection valve
c. Low compression