## 3 Results and Discussion
### Sorption Studies of EF and Reactivity Test on Alternator, Ignition Coil, and Starter Motor
#### 3.2.3. Test Method for Determining the Electrical Characteristics of the Starter Motor  
Sample No. 1 is a control tool, Sample No. 2 is 35 g/m\({}^{3}\), and Sample No. 3 is a 70 g/m\({}^{3}\) fumigation sample. According to the solenoid operation test result of the starter motor, the pull-in pinion was returned to normal in the forward, hold-in pinion maintenance, and return tests for all samples 1, 2, and 3. Table 4 shows the solenoid operation test results of the start motor. According to the no-load test result of the starter motor using a battery with a capacity of 12 [V]-100 [AH], the voltage drop of samples 1, 2, and 3 was 11.38-11.49 [V], satisfying the reference value of \(\geq\)10.8 [V] (Table 5). The consumption current was 100.2-104.9 [A], satisfying the reference value of 90-110 [A] (Table 5). The measured value is considered a decrease in battery performance according to the test. Therefore, after the fumigation test, the results of the solenoid operation test and no-load test of the motor are judged to be normal, and the effect of fumigation on the basic performance of the motor is small. Interestingly, a study reported that MB and methyl iodide (MI) exhibit sporicidal activities on electronic equipment during fumigation [33]. These two fumigants did not corrode the metal surface of the electronics, but they caused severe damage to rubber materials \begin{table}
\begin{tabular}{c c c c} \hline \hline \multicolumn{2}{c}{**Solenoid Operation Test**} & \multicolumn{2}{c}{**Test Results**} \\ \hline Sample 1 & \multirow{2}{*}{Selenoid switch} & PULL-IN & Pinion advance \\ (Control) & & HOLD-IN & Keep pinion forward \\  & & RETURN & Return to original position \\ \hline Sample 2 & \multirow{2}{*}{Selenoid switch} & PULL-IN & Pinion advance \\ (EF 35 g/m\({}^{3}\)) & & HOLD-IN & Keep pinion forward \\  & & RETURN & Return to original position \\ \hline Sample 3 & \multirow{2}{*}{Selenoid switch} & PULL-IN & Pinion advance \\ (EF 70 g/m\({}^{3}\)) & & HOLD-IN & Keep pinion forward \\  & & RETURN & Return to original position \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Solenoid operation test for the starter motor according to ethyl formate (EF) fumigation. \begin{table}
\begin{tabular}{c c c c} \hline \hline \multicolumn{2}{c}{**Fumigation Items**} & \multirow{2}{*}{**Measured Value**} & \multicolumn{2}{c}{**Reference**} & \multirow{2}{*}{**Judgment**} \\ \hline Sample 1 & \multirow{2}{*}{\begin{tabular}{c} Ignition coil primary resistance \\ (Control) \\ \end{tabular} } & 0.8 \(\pm\) 0.1 [\(\Omega\)] & 0.7–1.2 [\(\Omega\)] & \\  & Ignition coil secondary resistance & 7.10 \(\pm\) 0.1 [\(\mathrm{k\Omega}\)] & 5.0–10.0 [\(\mathrm{k\Omega}\)] & \\  & Ignition plug cap resistance & 5.21 \(\pm\) 0.1 [\(\mathrm{k\Omega}\)] & 3.0–6.0 [\(\mathrm{k\Omega}\)] & \\ \hline Sample 2 & \multirow{2}{*}{\
\begin{tabular}{c} Ignition coil primary resistance \\ (EF 35 g/m\({}^{3}\)) \\ \end{tabular} } & 0.9 \(\pm\) 0.1 [\(\Omega\)] & 0.7–1.2 [\(\Omega\)] & \\  & Ignition coil secondary resistance & 7.0 \(\pm\) 0.1 [\(\mathrm{k\Omega}\)] & 5.0–10.0 [\(\mathrm{k\Omega}\)] & \\  & Ignition plug cap resistance & 4.74 \(\pm\) 0.1 [\(\mathrm{k\Omega}\)] & 3.0–6.0 [\(\mathrm{k\Omega}\)] & \\ \hline Sample 3 & \multirow{2}{*}{
\begin{tabular}{c} Ignition coil primary resistance \\ (EF 70 g/m\({}^{3}\)) \\ \end{tabular} } & 0.8 \(\pm\) 0.1 [\(\Omega\)] & 0.7–1.2 [\(\Omega\)] & \\  & Ignition coil secondary resistance & 6.78 \(\pm\) 0.1 [\(\mathrm{k\Omega}\)] & 5.0–10.0 [\(\mathrm{k\Omega}\)] & \\  & Ignition plug cap resistance & 4.71 \(\pm\) 0.1 [\(\mathrm{k\Omega}\)] & 3.0–6.0 [\(\mathrm{k\Omega}\)] & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Electrical characteristics of the ignition coil according to ethyl formate (EF) fumigation.