diff --git a/firmware/config/boards/microrusefi/board_configuration.cpp b/firmware/config/boards/microrusefi/board_configuration.cpp
index 34295d9ba5..d61efc8a7e 100644
--- a/firmware/config/boards/microrusefi/board_configuration.cpp
+++ b/firmware/config/boards/microrusefi/board_configuration.cpp
@@ -91,6 +91,20 @@ static void setupEtb() {
 	// DIR pin
 	boardConfiguration->etb1.directionPin1 = GPIOA_8;
 
+	// set_fsio_output_pin 7 PC8
+#if EFI_FSIO
+	// set_rpn_expression 7 "1"
+	// disable ETB by default
+	setFsio(7, GPIOC_8, "1" PASS_CONFIG_PARAMETER_SUFFIX);
+	// enable ETB
+	// set_rpn_expression 7 "0"
+	//setFsio(7, GPIOC_8, "0" PASS_CONFIG_PARAMETER_SUFFIX);
+#endif /* EFI_FSIO */
+
+
+	// EFI_ADC_7: "31 - AN volt 3"
+	// engineConfiguration->throttlePedalPositionAdcChannel = EFI_ADC_7;
+
 	// Unused
 	boardConfiguration->etb1.controlPin2 = GPIO_UNASSIGNED;
 	boardConfiguration->etb1.directionPin2 = GPIO_UNASSIGNED;
@@ -110,15 +124,15 @@ static void setupDefaultSensorInputs() {
 	// Direct hall-only cam input
 	engineConfiguration->camInputs[0] = GPIOA_5;
 
-	// tps
+	// tps = "20 - AN volt 5"
 	engineConfiguration->tps1_1AdcChannel = EFI_ADC_13;
 	engineConfiguration->tps2_1AdcChannel = EFI_ADC_NONE;
 
-	// clt = AN temp 1
+	// clt = "18 - AN temp 1"
 	engineConfiguration->clt.adcChannel = EFI_ADC_0;
 	engineConfiguration->clt.config.bias_resistor = 2700;
 
-	// iat = AN temp 2
+	// iat = "23 - AN temp 2"
 	engineConfiguration->iat.adcChannel = EFI_ADC_1;
 	engineConfiguration->iat.config.bias_resistor = 2700;
 }
diff --git a/firmware/config/engines/custom_engine.cpp b/firmware/config/engines/custom_engine.cpp
index 53f0d028b6..ed12ade1f8 100644
--- a/firmware/config/engines/custom_engine.cpp
+++ b/firmware/config/engines/custom_engine.cpp
@@ -372,7 +372,7 @@ void setTle8888TestConfiguration(DECLARE_CONFIG_PARAMETER_SIGNATURE) {
 #if EFI_FSIO
 	setFsio(12, GPIOF_12, "0" PASS_CONFIG_PARAMETER_SUFFIX);
 	setFsio(14, GPIOF_13, "1" PASS_CONFIG_PARAMETER_SUFFIX);
-#endif
+#endif /* EFI_FSIO */
 	CONFIGB(etb1.directionPin1) = GPIOF_15;
 	CONFIGB(etb1.directionPin2) = GPIOF_14;
 #endif /* STM32_HAS_GPIOF */
diff --git a/firmware/controllers/core/fsio_impl.cpp b/firmware/controllers/core/fsio_impl.cpp
index 0aaf4ededc..8f0ed84c98 100644
--- a/firmware/controllers/core/fsio_impl.cpp
+++ b/firmware/controllers/core/fsio_impl.cpp
@@ -697,9 +697,7 @@ void initFsioImpl(Logging *sharedLogger DECLARE_ENGINE_PARAMETER_SUFFIX) {
 
 	addConsoleActionSS("set_fsio_pid_output_pin", (VoidCharPtrCharPtr) setFsioPidOutputPin);
 	addConsoleActionSS("set_fsio_output_pin", (VoidCharPtrCharPtr) setFsioOutputPin);
-#if EFI_PROD_CODE
 	addConsoleActionII("set_fsio_output_frequency", (VoidIntInt) setFsioFrequency);
-#endif
 	addConsoleActionSS("set_fsio_digital_input_pin", (VoidCharPtrCharPtr) setFsioDigitalInputPin);
 	addConsoleActionSS("set_fsio_analog_input_pin", (VoidCharPtrCharPtr) setFsioAnalogInputPin);
 
diff --git a/firmware/controllers/core/fsio_impl.h b/firmware/controllers/core/fsio_impl.h
index 73a0ae9d8e..f9e38f046f 100644
--- a/firmware/controllers/core/fsio_impl.h
+++ b/firmware/controllers/core/fsio_impl.h
@@ -21,6 +21,10 @@ typedef Map3D<FSIO_TABLE_8, FSIO_TABLE_8, uint8_t, float> fsio8_Map3D_u8t;
 #define MAGIC_OFFSET_FOR_CRITICAL_ENGINE 5
 
 float getEngineValue(le_action_e action DECLARE_ENGINE_PARAMETER_SUFFIX);
+/**
+ * set_fsio_output_pin 7 PE3
+ * set_rpn_expression 1 "rpm 0 fsio_setting <"
+ */
 void setFsio(int index, brain_pin_e pin, const char * exp DECLARE_CONFIG_PARAMETER_SUFFIX);
 void setFsioExt(int index, brain_pin_e pin, const char * exp, int pwmFrequency DECLARE_CONFIG_PARAMETER_SUFFIX);
 
diff --git a/firmware/controllers/system/dc_motor.h b/firmware/controllers/system/dc_motor.h
index 104b2a373c..8c6722b123 100644
--- a/firmware/controllers/system/dc_motor.h
+++ b/firmware/controllers/system/dc_motor.h
@@ -40,7 +40,18 @@ class TwoPinDcMotor : public DcMotor
 public:
     enum class ControlType
     {
+    	/**
+    	 * For example TLE7209 - two control wires:
+    	 * PWM on both wires - one to open, another to close
+    	 */
         PwmDirectionPins,
+		/**
+		 * For example VNH2SP30 - three control wires:
+		 * PWM on 'enable' PIN, two binary pins for direction
+		 *
+		 * TLE9201 with two wire control also uses this mode
+		 * PWM on one pin, open/close using one binary direction pin, second direction pin unused
+		 */
         PwmEnablePin,
     };