https://github.com/rusefi/rusefi/issues/2274

firmware/controllers/actuators/idle_hardware.cpp

@@ -87,6 +87,10 @@ static void applyIdleSolenoidPinState(int stateIndex, PwmConfig *state) /* pwm_g
 	efiAssertVoid(CUSTOM_ERR_6646, state->multiChannelStateSequence.waveCount == 1, "invalid idle waveCount");
 	OutputPin *output = state->outputPins[0];
 	int value = state->multiChannelStateSequence.getChannelState(/*channelIndex*/0, stateIndex);
+	/**
+	 * - we want stopped engine to be silent to facilitate bench testing of low volume stuff like coil spark
+	 * - we want stopped engine to draw as little amps as possible
+	 */
 	if (!value /* always allow turning solenoid off */ ||
 			(GET_RPM() != 0 || timeToStopIdleTest != 0) /* do not run solenoid unless engine is spinning or bench testing in progress */
 			) {