diff --git a/biometrics/face/aidl/default/FakeFaceEngine.cpp b/biometrics/face/aidl/default/FakeFaceEngine.cpp
index 0f088f4..578231d 100644
--- a/biometrics/face/aidl/default/FakeFaceEngine.cpp
+++ b/biometrics/face/aidl/default/FakeFaceEngine.cpp
@@ -136,56 +136,127 @@
                                       const std::future<void>& cancel) {
     BEGIN_OP(FaceHalProperties::operation_authenticate_latency().value_or(0));
 
-    // Signal to the framework that we have begun authenticating.
-    AuthenticationFrame frame;
-    frame.data.acquiredInfo = AcquiredInfo::START;
-    frame.data.vendorCode = 0;
-    cb->onAuthenticationFrame(frame);
-
-    // Also signal that we have opened the camera.
-    frame = {};
-    frame.data.acquiredInfo = AcquiredInfo::FIRST_FRAME_RECEIVED;
-    frame.data.vendorCode = 0;
-    cb->onAuthenticationFrame(frame);
-
-    auto now = Util::getSystemNanoTime();
-    int64_t duration = FaceHalProperties::operation_authenticate_duration().value_or(0);
-    if (duration > 0) {
-        do {
-            SLEEP_MS(5);
-        } while (!Util::hasElapsed(now, duration));
-    }
-
-    if (FaceHalProperties::operation_authenticate_fails().value_or(false)) {
-        LOG(ERROR) << "Fail: operation_authenticate_fails";
-        cb->onError(Error::VENDOR, 0 /* vendorError */);
-        return;
-    }
-
-    if (FaceHalProperties::lockout().value_or(false)) {
-        LOG(ERROR) << "Fail: lockout";
-        cb->onLockoutPermanent();
-        cb->onError(Error::HW_UNAVAILABLE, 0 /* vendorError */);
-        return;
-    }
-
-    if (shouldCancel(cancel)) {
-        LOG(ERROR) << "Fail: cancel";
-        cb->onError(Error::CANCELED, 0 /* vendorCode */);
-        return;
-    }
-
     auto id = FaceHalProperties::enrollment_hit().value_or(0);
     auto enrolls = FaceHalProperties::enrollments();
     auto isEnrolled = std::find(enrolls.begin(), enrolls.end(), id) != enrolls.end();
-    if (id < 0 || !isEnrolled) {
-        LOG(ERROR) << (isEnrolled ? "invalid enrollment hit" : "Fail: not enrolled");
-        cb->onAuthenticationFailed();
+
+    auto vec2str = [](std::vector<AcquiredInfo> va) {
+        std::stringstream ss;
+        bool isFirst = true;
+        for (auto ac : va) {
+            if (!isFirst) ss << ",";
+            ss << std::to_string((int8_t)ac);
+            isFirst = false;
+        }
+        return ss.str();
+    };
+
+    // default behavior mimic face sensor in U
+    int64_t defaultAuthDuration = 500;
+    std::string defaultAcquiredInfo =
+            vec2str({AcquiredInfo::START, AcquiredInfo::FIRST_FRAME_RECEIVED});
+    if (!isEnrolled) {
+        std::vector<AcquiredInfo> v;
+        for (int i = 0; i < 56; i++) v.push_back(AcquiredInfo::NOT_DETECTED);
+        defaultAcquiredInfo += "," + vec2str(v);
+        defaultAuthDuration = 2100;
+    } else {
+        defaultAcquiredInfo += "," + vec2str({AcquiredInfo::TOO_BRIGHT, AcquiredInfo::TOO_BRIGHT,
+                                              AcquiredInfo::TOO_BRIGHT, AcquiredInfo::TOO_BRIGHT,
+                                              AcquiredInfo::GOOD, AcquiredInfo::GOOD});
+    }
+
+    int64_t now = Util::getSystemNanoTime();
+    int64_t duration =
+            FaceHalProperties::operation_authenticate_duration().value_or(defaultAuthDuration);
+    auto acquired =
+            FaceHalProperties::operation_authenticate_acquired().value_or(defaultAcquiredInfo);
+    auto acquiredInfos = Util::parseIntSequence(acquired);
+    int N = acquiredInfos.size();
+
+    if (N == 0) {
+        LOG(ERROR) << "Fail to parse authentiate acquired info: " + acquired;
         cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorError */);
         return;
     }
 
-    cb->onAuthenticationSucceeded(id, {} /* hat */);
+    int i = 0;
+    do {
+        if (FaceHalProperties::lockout().value_or(false)) {
+            LOG(ERROR) << "Fail: lockout";
+            cb->onLockoutPermanent();
+            cb->onError(Error::HW_UNAVAILABLE, 0 /* vendorError */);
+            return;
+        }
+
+        if (FaceHalProperties::operation_authenticate_fails().value_or(false)) {
+            LOG(ERROR) << "Fail: operation_authenticate_fails";
+            cb->onAuthenticationFailed();
+            return;
+        }
+
+        auto err = FaceHalProperties::operation_authenticate_error().value_or(0);
+        if (err != 0) {
+            LOG(ERROR) << "Fail: operation_authenticate_error";
+            auto ec = convertError(err);
+            cb->onError(ec.first, ec.second);
+            return; /* simply terminating current operation for any user inserted error,
+                            revisit if tests need*/
+        }
+
+        if (shouldCancel(cancel)) {
+            LOG(ERROR) << "Fail: cancel";
+            cb->onError(Error::CANCELED, 0 /* vendorCode */);
+            return;
+        }
+
+        if (i < N) {
+            auto ac = convertAcquiredInfo(acquiredInfos[i]);
+            AuthenticationFrame frame;
+            frame.data.acquiredInfo = ac.first;
+            frame.data.vendorCode = ac.second;
+            cb->onAuthenticationFrame(frame);
+            LOG(INFO) << "AcquiredInfo:" << i << ": (" << (int)ac.first << "," << (int)ac.second
+                      << ")";
+            i++;
+        }
+
+        SLEEP_MS(duration / N);
+    } while (!Util::hasElapsed(now, duration));
+
+    if (id > 0 && isEnrolled) {
+        cb->onAuthenticationSucceeded(id, {} /* hat */);
+        return;
+    } else {
+        LOG(ERROR) << "Fail: face not enrolled";
+        cb->onAuthenticationFailed();
+        cb->onError(Error::TIMEOUT, 0 /* vendorError*/);
+        return;
+    }
+}
+
+std::pair<AcquiredInfo, int32_t> FakeFaceEngine::convertAcquiredInfo(int32_t code) {
+    std::pair<AcquiredInfo, int32_t> res;
+    if (code > FACE_ACQUIRED_VENDOR_BASE) {
+        res.first = AcquiredInfo::VENDOR;
+        res.second = code - FACE_ACQUIRED_VENDOR_BASE;
+    } else {
+        res.first = (AcquiredInfo)code;
+        res.second = 0;
+    }
+    return res;
+}
+
+std::pair<Error, int32_t> FakeFaceEngine::convertError(int32_t code) {
+    std::pair<Error, int32_t> res;
+    if (code > FACE_ERROR_VENDOR_BASE) {
+        res.first = Error::VENDOR;
+        res.second = code - FACE_ERROR_VENDOR_BASE;
+    } else {
+        res.first = (Error)code;
+        res.second = 0;
+    }
+    return res;
 }
 
 void FakeFaceEngine::detectInteractionImpl(ISessionCallback* cb, const std::future<void>& cancel) {
@@ -315,4 +386,4 @@
     cb->onLockoutCleared();
 }
 
-}  // namespace aidl::android::hardware::biometrics::face
\ No newline at end of file
+}  // namespace aidl::android::hardware::biometrics::face
diff --git a/biometrics/face/aidl/default/FakeFaceEngine.h b/biometrics/face/aidl/default/FakeFaceEngine.h
index eb99441..06dd396 100644
--- a/biometrics/face/aidl/default/FakeFaceEngine.h
+++ b/biometrics/face/aidl/default/FakeFaceEngine.h
@@ -62,6 +62,12 @@
     void resetLockoutImpl(ISessionCallback* cb, const keymaster::HardwareAuthToken& /*hat*/);
 
     std::mt19937 mRandom;
+
+  private:
+    static constexpr int32_t FACE_ACQUIRED_VENDOR_BASE = 1000;
+    static constexpr int32_t FACE_ERROR_VENDOR_BASE = 1000;
+    std::pair<AcquiredInfo, int32_t> convertAcquiredInfo(int32_t code);
+    std::pair<Error, int32_t> convertError(int32_t code);
 };
 
 }  // namespace aidl::android::hardware::biometrics::face
diff --git a/biometrics/face/aidl/default/README.md b/biometrics/face/aidl/default/README.md
index 77bfe57..516a7aa 100644
--- a/biometrics/face/aidl/default/README.md
+++ b/biometrics/face/aidl/default/README.md
@@ -18,6 +18,7 @@
 Face VHAL enabling is gated by the following two AND conditions:
 1. The Face VHAL feature flag (as part of Trunk-development strategy) must be tured until the flags life-cycle ends.
 2. The Face VHAL must be enabled via sysprop
+See adb commands below
 
 ##Getting Stared
 
@@ -47,8 +48,7 @@
 $ adb shell setprop vendor.face.virtual.operation_authenticate_duration 800
 $ adb shell setprop vendor.face.virtual.enrollment_hit 1
 ```
-Note: At the initial phase of the Face VHAL development, Face-on-camera simulation is not supported, hence
-the authentication immediately occurrs  as soon as the authentication request arriving at VHAL.
+Refer to face.sysprop for full supported features of authentication, such as error and acquiredInfo insertion
 
 
 ## Enrollment via Setup
diff --git a/biometrics/face/aidl/default/face.sysprop b/biometrics/face/aidl/default/face.sysprop
index 6b0f37f..be32015 100644
--- a/biometrics/face/aidl/default/face.sysprop
+++ b/biometrics/face/aidl/default/face.sysprop
@@ -157,3 +157,22 @@
     access: ReadWrite
     api_name: "operation_authenticate_duration"
 }
+
+# insert error for authenticate operations
+prop {
+    prop_name: "vendor.face.virtual.operation_authenticate_error"
+    type: Integer
+    scope: Internal
+    access: ReadWrite
+    api_name: "operation_authenticate_error"
+}
+
+# acquired info during authentication in format of sequence
+prop {
+    prop_name: "vendor.face.virtual.operation_authenticate_acquired"
+    type: String
+    scope: Internal
+    access: ReadWrite
+    api_name: "operation_authenticate_acquired"
+}
+
diff --git a/biometrics/face/aidl/default/tests/FakeFaceEngineTest.cpp b/biometrics/face/aidl/default/tests/FakeFaceEngineTest.cpp
index c8ad6b7..6897dc4 100644
--- a/biometrics/face/aidl/default/tests/FakeFaceEngineTest.cpp
+++ b/biometrics/face/aidl/default/tests/FakeFaceEngineTest.cpp
@@ -245,7 +245,7 @@
     FaceHalProperties::enrollments({3});
     FaceHalProperties::enrollment_hit(100);
     mEngine.authenticateImpl(mCallback.get(), 0 /* operationId*/, mCancel.get_future());
-    ASSERT_EQ(Error::UNABLE_TO_PROCESS, mCallback->mError);
+    ASSERT_EQ(Error::TIMEOUT, mCallback->mError);
     ASSERT_TRUE(mCallback->mAuthenticateFailed);
 }
 
@@ -380,4 +380,4 @@
     ASSERT_FALSE(mCallback->mAuthenticateFailed);
 }
 
-}  // namespace aidl::android::hardware::biometrics::face
\ No newline at end of file
+}  // namespace aidl::android::hardware::biometrics::face