diff --git a/firmware/config/engines/custom_engine.cpp b/firmware/config/engines/custom_engine.cpp
index 864333d7f9..f9cc6549f4 100644
--- a/firmware/config/engines/custom_engine.cpp
+++ b/firmware/config/engines/custom_engine.cpp
@@ -28,39 +28,6 @@
 #include "scheduler.h"
 #endif /* EFI_PROD_CODE */
 
-#if EFI_PROD_CODE
-static int periodIndex = 0;
-
-static OutputPin testPin;
-static scheduling_s testScheduling;
-
-static int test557[] = {5, 5, 10, 10, 20, 20, 50, 50, 100, 100, 200, 200, 500, 500, 500, 500};
-#define TEST_LEN 16
-
-efitimeus_t testTime;
-
-static void toggleTestAndScheduleNext(void *) {
-	testPin.toggle();
-	periodIndex = (periodIndex + 1) % TEST_LEN;
-	testTime += test557[periodIndex];
-	engine->executor.scheduleByTimestamp("test", &testScheduling, testTime, &toggleTestAndScheduleNext);
-}
-
-/**
- * https://github.com/rusefi/rusefi/issues/557 common rail / direct injection scheduling control test
- */
-void runSchedulingPrecisionTestIfNeeded(void) {
-	if (!isBrainPinValid(engineConfiguration->test557pin)) {
-		return;
-	}
-
-	testPin.initPin("test", engineConfiguration->test557pin);
-	testPin.setValue(0);
-	testTime = getTimeNowUs();
-	toggleTestAndScheduleNext(/*unused*/ nullptr);
-}
-#endif /* EFI_PROD_CODE */
-
 void setDiscoveryPdm() {
 }
 
diff --git a/firmware/config/engines/custom_engine.h b/firmware/config/engines/custom_engine.h
index f03146353e..eac25c01bc 100644
--- a/firmware/config/engines/custom_engine.h
+++ b/firmware/config/engines/custom_engine.h
@@ -9,7 +9,6 @@
 
 #include "engine_configuration.h"
 void setFrankensoConfiguration();
-void runSchedulingPrecisionTestIfNeeded(void);
 void setDiscoveryPdm();
 void setFrankensoBoardTestConfiguration();
 void setEtbTestConfiguration();
diff --git a/firmware/integration/rusefi_config.txt b/firmware/integration/rusefi_config.txt
index df774e4320..5b29da04cc 100644
--- a/firmware/integration/rusefi_config.txt
+++ b/firmware/integration/rusefi_config.txt
@@ -744,7 +744,7 @@ output_pin_e acFanPin;Optional Radiator Fan used with A/C
 
 	Gpio[EGT_CHANNEL_COUNT iterate] max31855_cs;
 	brain_input_pin_e flexSensorPin;Continental/GM flex fuel sensor, 50-150hz type;
-	Gpio test557pin
+	uint16_t unused720
 	pin_output_mode_e stepperDirectionPinMode;
 
 	spi_device_e mc33972spiDevice;
diff --git a/firmware/rusefi.cpp b/firmware/rusefi.cpp
index 7837df6037..6cbaef006a 100644
--- a/firmware/rusefi.cpp
+++ b/firmware/rusefi.cpp
@@ -290,8 +290,6 @@ void runRusEfiWithConfig() {
 
 		// This has to happen after RegisteredOutputPins are init'd: otherwise no change will be detected, and no init will happen
 		rememberCurrentConfiguration();
-
-		runSchedulingPrecisionTestIfNeeded();
 	}
 }
 
diff --git a/firmware/tunerstudio/tunerstudio.template.ini b/firmware/tunerstudio/tunerstudio.template.ini
index 6dd024e782..dd9a52e65e 100644
--- a/firmware/tunerstudio/tunerstudio.template.ini
+++ b/firmware/tunerstudio/tunerstudio.template.ini
@@ -2920,7 +2920,6 @@ cmd_set_engine_type_default					= "@@TS_IO_TEST_COMMAND_char@@@@ts_command_e_TS_
 		field = "ETB#2 Disable",						etbIo2_disablePin	@@if_ts_show_etb_pins
 		field = "SD CS Pin",							sdCardCsPin @@if_ts_show_sd_card
 		field = "MIL/Check Engine output",			malfunctionIndicatorPin
-		field = "test557pin",							test557pin
 		field = "Fan Pin",								fanPin
 		field = "A/C Relay",							acRelayPin
 		field = "Main Relay Pin",						mainRelayPin