diff --git a/L1Trigger/TrackFindingTracklet/interface/MatchEngineUnit.h b/L1Trigger/TrackFindingTracklet/interface/MatchEngineUnit.h
index 2fbd253507b51..b084b72158623 100644
--- a/L1Trigger/TrackFindingTracklet/interface/MatchEngineUnit.h
+++ b/L1Trigger/TrackFindingTracklet/interface/MatchEngineUnit.h
@@ -80,7 +80,7 @@ namespace trklet {
     VMStubsMEMemory* vmstubsmemory_;
 
     unsigned int nrzbins_;
-    unsigned int rzbin_;
+    unsigned int rzbin_, rzbin__, rzbin___, rzbin__t;
     unsigned int phibin_;
     int shift_;
 
@@ -99,6 +99,9 @@ namespace trklet {
 
     unsigned int layerdisk_;
 
+    //The minimum radius for 2s disks in projection bins
+    unsigned int ir2smin_;
+
     //Save state at the start of istep
     bool almostfullsave_;
 
diff --git a/L1Trigger/TrackFindingTracklet/src/MatchEngineUnit.cc b/L1Trigger/TrackFindingTracklet/src/MatchEngineUnit.cc
index 496cf98b2e0e7..678415d5288b3 100644
--- a/L1Trigger/TrackFindingTracklet/src/MatchEngineUnit.cc
+++ b/L1Trigger/TrackFindingTracklet/src/MatchEngineUnit.cc
@@ -18,6 +18,12 @@ MatchEngineUnit::MatchEngineUnit(const Settings& settings,
   good__ = false;
   good__t = false;
   good___ = false;
+  ir2smin_ = 0;
+  if (layerdisk_ >= N_LAYER) {
+    double rmin2s = (layerdisk_ < N_LAYER + 2) ? settings_.rDSSinner(0) : settings_.rDSSouter(0);
+    ir2smin_ = (1 << (N_RZBITS + NFINERZBITS)) * (rmin2s - settings_.rmindiskvm()) /
+               (settings_.rmaxdisk() - settings_.rmindiskvm());
+  }
 }
 
 void MatchEngineUnit::setAlmostFull() { almostfullsave_ = candmatches_.nearfull(); }
@@ -89,6 +95,7 @@ void MatchEngineUnit::step() {
   }
 
   vmstub__ = vmstubsmemory_->getVMStubMEBin(slot, istub_);
+  rzbin__ = rzbin_ + use_[iuse_].first;
 
   isPSseed__ = isPSseed_;
   projrinv__ = projrinv_;
@@ -107,9 +114,21 @@ void MatchEngineUnit::step() {
 
 void MatchEngineUnit::processPipeline() {
   if (good___) {
-    bool isPSmodule = vmstub___.isPSmodule();
     int stubfinerz = vmstub___.finerz().value();
     int stubfinephi = vmstub___.finephi().value();
+    bool isPSmodule = false;
+
+    if (barrel_) {
+      isPSmodule = layerdisk_ < N_PSLAYER;
+    } else {
+      const int absz = (1 << settings_.MEBinsBits()) - 1;
+      unsigned int irstub = ((rzbin___ & absz) << NFINERZBITS) + stubfinerz;
+
+      //Verify that ir2smin_ is initialized and check if irstub is less than radius of innermost 2s module
+      assert(ir2smin_ > 0);
+      isPSmodule = irstub < ir2smin_;
+    }
+    assert(isPSmodule == vmstub___.isPSmodule());
 
     int deltaphi = stubfinephi - projfinephi___;
 
@@ -162,6 +181,7 @@ void MatchEngineUnit::processPipeline() {
   isPSseed___ = isPSseed__t;
   good___ = good__t;
   vmstub___ = vmstub__t;
+  rzbin___ = rzbin__t;
 
   proj__t = proj__;
   projfinephi__t = projfinephi__;
@@ -170,6 +190,7 @@ void MatchEngineUnit::processPipeline() {
   isPSseed__t = isPSseed__;
   good__t = good__;
   vmstub__t = vmstub__;
+  rzbin__t = rzbin__;
 }
 
 void MatchEngineUnit::reset() {