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2 Short Test
2.1. Fig.3: Press the test button for less than 1 second. This will either open or close the
valve, depending on initial position.
2.2. Each subsequent short press of the test button will open or close the valve, establishing if the
valve is obeying commands from the engine control unit correctly.
2.3. A single click from the EGR valve will be heard each cycle.
2.4. If the valve has been removed from the vehicle, carbon can be removed manually with the valve
held open.
3. Self-cleaning cycle
3.1. Press the test button for more than 1 second.This will initiate a continuous test cycle lasting 90
seconds, during which time the valve will repeatedly open and close. This will free accumulated
carbon deposits from the valve and seat.
3.2. A continuous clicking sound will be heard from the valve.
3.3. During the test the indicator light will flash red.
3.4. At the end of 90 seconds, a steady green light will show for 3 seconds. When this goes out, the
cleaning cycle is complete.
4. Fault indication
4.1. If the unit is connected to a 12V power source without the test leads connected, an alarm will
sound continuously indicating the presence of an open circuit.
4.2. Similarly, if the tester is connected to a faulty EGR valve the alarm will sound. This indicates
that the valve unit needs replacement.
5. Disconnection
5.1. When test is completed, disconnect tester from the 12V DC power source.
5.2. Disconnect test lead from EGR valve.
5.3. Reconnect multi-pin plug from engine control unit to EGR valve socket.
5.4. Remove all tools from engine bay before starting engine.
