Index: firmware/App/Modes/SelfTests.c
===================================================================
diff -u -rc3f8a0d846621b3b10330eea578aeee89e734a91 -r764c4865feb788998136c6129a7ec656b563047d
--- firmware/App/Modes/SelfTests.c	(.../SelfTests.c)	(revision c3f8a0d846621b3b10330eea578aeee89e734a91)
+++ firmware/App/Modes/SelfTests.c	(.../SelfTests.c)	(revision 764c4865feb788998136c6129a7ec656b563047d)
@@ -50,7 +50,8 @@
 #define DECAY_PRESSURE_SELF_TEST_TIME                       ( 4 * MS_PER_SECOND )                   ///< time to wait for pressure to decay in ms.
 #define STABILTY_PRESSURE_SELF_TEST_TIME                    ( 5 * MS_PER_SECOND )                   ///< Time to wait for pressure to stabilize in ms.
 #define NORMALIZED_PRESSURE_SELF_TEST_TIME                  ( 20 * MS_PER_SECOND )                  ///< Time to wait for pressure to normalize in ms.
-#define NORMALIZED_PRESSURE_SELF_TEST_HALF_TIME             ( 5 * MS_PER_SECOND )                   ///< Half the time to wait for pressure to normalize in ms.
+#define NORMALIZED_PRESSURE_SELF_TEST_VBT_TIMER             ( 7 * MS_PER_SECOND )                   ///< Time to wait until we open VBT during normal pressure tests.
+#define NORMALIZED_PRESSURE_SELF_TEST_VDI_TIMER             ( 5 * MS_PER_SECOND )                   ///< Time to wait until we open VDI during normal pressure tests.
 
 #define ARTERIAL_DECAY_PRESSURE_DIFF_TOLERANCE_MMHG         5.0F                                    ///< Difference in arterial pressure readings after the pump stops (in mmHg).
 #define VENOUS_DECAY_PRESSURE_DIFF_TOLERANCE_MMHG           5.0F                                    ///< Difference in venous pressure readings after the pump stops (in mmHg).
@@ -1252,9 +1253,15 @@
     F32 const arterialPressureDiff = fabs( getFilteredArterialPressure() - previousNormalArterialPressure );
     F32 const venousPressureDiff = fabs( getFilteredVenousPressure() - previousNormalVenousPressure );
 
-    // open air trap after NORMALIZED_PRESSURE_SELF_TEST_HALF_TIME seconds
-    if ( TRUE == didTimeout( pressureSelfTestNormalizedStartTime, NORMALIZED_PRESSURE_SELF_TEST_HALF_TIME ) )
+    // open VDI to Pos A after timer threshold
+    if ( TRUE == didTimeout( pressureSelfTestNormalizedStartTime, NORMALIZED_PRESSURE_SELF_TEST_VDI_TIMER ) )
     {
+        setValvePosition( VDI, VALVE_POSITION_A_INSERT_EJECT );
+    }
+
+    // open air trap after time threshold.
+    if ( TRUE == didTimeout( pressureSelfTestNormalizedStartTime, NORMALIZED_PRESSURE_SELF_TEST_VBT_TIMER ) )
+    {
         setValveAirTrap( STATE_OPEN );
     }