diff --git a/java_console/io/src/main/java/com/rusefi/io/can/Elm327Connector.java b/java_console/io/src/main/java/com/rusefi/io/can/Elm327Connector.java
index 6b57a2de4e..0207744fc3 100644
--- a/java_console/io/src/main/java/com/rusefi/io/can/Elm327Connector.java
+++ b/java_console/io/src/main/java/com/rusefi/io/can/Elm327Connector.java
@@ -229,7 +229,8 @@ public class Elm327Connector implements Closeable {
 	public static byte[] byteToString(byte[] hdr, byte[] data, int offset, int payloadLength) {
 		int totalLength = hdr.length + payloadLength;
 		byte[] hexData = new byte[totalLength * 2 + 1];
-		for (int i = 0, j = 0; i < totalLength; i++, j += 2) {
+		for (int i = 0; i < totalLength; i++) {
+			int j = i * 2;
 			int v = ((i < hdr.length) ? hdr[i] : data[i - hdr.length + offset]) & 0xFF;
 			hexData[j] = HEX_ARRAY[v >>> 4];
 			hexData[j + 1] = HEX_ARRAY[v & 0x0F];
diff --git a/java_console/io/src/test/java/com/rusefi/io/can/IsoTpConnectorTest.java b/java_console/io/src/test/java/com/rusefi/io/can/IsoTpConnectorTest.java
index 18a2231b75..5ac00cc5a1 100644
--- a/java_console/io/src/test/java/com/rusefi/io/can/IsoTpConnectorTest.java
+++ b/java_console/io/src/test/java/com/rusefi/io/can/IsoTpConnectorTest.java
@@ -35,7 +35,9 @@ public class IsoTpConnectorTest {
         IsoTpConnector.sendStrategy(crcWrappedCrcRequest, testConnector);
 
         assertEquals(2, packets.size());
+        //                       10    0B                                  50
         assertEquals("31 30 30 42 30 30 30 35 36 42 30 30 30 30 35 30 0D ", packets.get(0));
+        //                       21    5F    69    AF    A0    70
         assertEquals("32 31 35 46 36 39 41 46 41 30 37 30 0D ", packets.get(1));
     }
 }