diff --git a/firmware/controllers/algo/engine.cpp b/firmware/controllers/algo/engine.cpp
index 4ac2d49e54..f815b6cdf3 100644
--- a/firmware/controllers/algo/engine.cpp
+++ b/firmware/controllers/algo/engine.cpp
@@ -605,6 +605,7 @@ injection_mode_e Engine::getCurrentInjectionMode() {
 }
 
 // see also in TunerStudio project '[doesTriggerImplyOperationMode] tag
+// this is related to 'knownOperationMode' flag
 static bool doesTriggerImplyOperationMode(trigger_type_e type) {
 	return type != TT_TOOTHED_WHEEL
 			&& type != TT_ONE
diff --git a/firmware/controllers/trigger/decoders/trigger_structure.cpp b/firmware/controllers/trigger/decoders/trigger_structure.cpp
index 4a58158572..19b86d3195 100644
--- a/firmware/controllers/trigger/decoders/trigger_structure.cpp
+++ b/firmware/controllers/trigger/decoders/trigger_structure.cpp
@@ -85,7 +85,8 @@ void TriggerWaveform::initialize(operation_mode_e operationMode) {
 #if EFI_UNIT_TEST
 	memset(&triggerSignalIndeces, 0, sizeof(triggerSignalIndeces));
 	memset(&triggerSignalStates, 0, sizeof(triggerSignalStates));
-#endif
+	knownOperationMode = true;
+#endif // EFI_UNIT_TEST
 }
 
 size_t TriggerWaveform::getSize() const {
diff --git a/firmware/controllers/trigger/decoders/trigger_structure.h b/firmware/controllers/trigger/decoders/trigger_structure.h
index b25663f4ff..8d56801300 100644
--- a/firmware/controllers/trigger/decoders/trigger_structure.h
+++ b/firmware/controllers/trigger/decoders/trigger_structure.h
@@ -185,6 +185,8 @@ public:
 	 */
 	int triggerSignalIndeces[PWM_PHASE_MAX_COUNT];
 	int triggerSignalStates[PWM_PHASE_MAX_COUNT];
+	// see also 'doesTriggerImplyOperationMode'
+	bool knownOperationMode = true;
 #endif
 
 	/**
diff --git a/firmware/controllers/trigger/decoders/trigger_subaru.cpp b/firmware/controllers/trigger/decoders/trigger_subaru.cpp
index ace5bfcc6b..42a05e5aaa 100644
--- a/firmware/controllers/trigger/decoders/trigger_subaru.cpp
+++ b/firmware/controllers/trigger/decoders/trigger_subaru.cpp
@@ -14,6 +14,11 @@
 void initialize36_2_2_2(TriggerWaveform *s) {
 	s->initialize(FOUR_STROKE_CRANK_SENSOR);
 
+#if EFI_UNIT_TEST
+	// placed on 'cam' on '2-stroke' rotary
+	s->knownOperationMode = false;
+#endif // EFI_UNIT_TEST
+
 	float wide = 30 * 2;
 	float narrow = 10 * 2;
 
diff --git a/firmware/controllers/trigger/decoders/trigger_universal.cpp b/firmware/controllers/trigger/decoders/trigger_universal.cpp
index 5d21af1a51..f8c7967f12 100644
--- a/firmware/controllers/trigger/decoders/trigger_universal.cpp
+++ b/firmware/controllers/trigger/decoders/trigger_universal.cpp
@@ -43,6 +43,9 @@ void initializeSkippedToothTriggerWaveformExt(TriggerWaveform *s, int totalTeeth
 	}
 	efiAssertVoid(CUSTOM_NULL_SHAPE, s != NULL, "TriggerWaveform is NULL");
 	s->initialize(operationMode);
+#if EFI_UNIT_TEST
+	s->knownOperationMode = false;
+#endif // EFI_UNIT_TEST
 
 	s->setTriggerSynchronizationGap(skippedCount + 1);
 	s->shapeWithoutTdc = (totalTeethCount > 1) && (skippedCount == 0);
diff --git a/java_tools/configuration_definition/src/main/java/com/rusefi/trigger/TriggerWheelInfo.java b/java_tools/configuration_definition/src/main/java/com/rusefi/trigger/TriggerWheelInfo.java
index cdd22682f5..bdcbac775f 100644
--- a/java_tools/configuration_definition/src/main/java/com/rusefi/trigger/TriggerWheelInfo.java
+++ b/java_tools/configuration_definition/src/main/java/com/rusefi/trigger/TriggerWheelInfo.java
@@ -10,6 +10,7 @@ import java.util.stream.Collectors;
 import static com.rusefi.config.generated.Fields.TRIGGER_IS_CRANK_KEY;
 import static com.rusefi.config.generated.Fields.TRIGGER_IS_SECOND_WHEEL_CAM;
 import static com.rusefi.config.generated.Fields.TRIGGER_HAS_SECOND_CHANNEL;
+import static com.rusefi.config.generated.Fields.TRIGGER_HARDCODED_OPERATION_MODE;
 
 public class TriggerWheelInfo {
     private final int id;
@@ -60,6 +61,8 @@ public class TriggerWheelInfo {
                 case TRIGGER_HAS_SECOND_CHANNEL:
                     Boolean.parseBoolean(keyValue[1]);
                     break;
+                case TRIGGER_HARDCODED_OPERATION_MODE:
+                    break;
                 default:
                     throw new IllegalStateException("Unexpected key/value: " + line);
             }
diff --git a/unit_tests/tests/trigger/test_all_triggers.cpp b/unit_tests/tests/trigger/test_all_triggers.cpp
index d178116569..3ca9d10f9a 100644
--- a/unit_tests/tests/trigger/test_all_triggers.cpp
+++ b/unit_tests/tests/trigger/test_all_triggers.cpp
@@ -71,6 +71,7 @@ TEST_P(AllTriggersFixture, TestTrigger) {
 	fprintf(fp, "%s=%s\n", TRIGGER_IS_CRANK_KEY, shape->getOperationMode() == FOUR_STROKE_CRANK_SENSOR ? "true" : "false");
 	fprintf(fp, "%s=%s\n", TRIGGER_IS_SECOND_WHEEL_CAM, shape->isSecondWheelCam ? "true" : "false");
 	fprintf(fp, "%s=%s\n", TRIGGER_HAS_SECOND_CHANNEL, shape->needSecondTriggerInput ? "true" : "false");
+	fprintf(fp, "%s=%s\n", TRIGGER_HARDCODED_OPERATION_MODE, shape->knownOperationMode ? "true" : "false");
 	fprintf(fp, "# duty %.2f %.2f\n", shape->expectedDutyCycle[0], shape->expectedDutyCycle[1]);
 
 	for (size_t i = 0; i < shape->getLength(); i++) {