TEST 4: Is The EVRV Solenoid Stuck Open? PART 1
To check if the EVRV solenoid is stuck open, we'll disconnect it from its electrical connector and check if it's allowing vacuum to flow from its inlet port to its outlet port.
The EVRV solenoid's inlet port is labeled with the number 2 and its vacuum line connects to an intake manifold vacuum source on the throttle body.
The EVRV solenoid's outlet port is labeled with the number 1 and its vacuum line connects to the EGR valve.
If the EVRV solenoid is stuck open, the vacuum line that connects to the EGR valve will have vacuum while you pump the vacuum pump.
The expected and correct test result is that the EVRV solenoid is in its closed position and is NOT allowing vacuum to flow to the EGR valve.
These are the test steps:
- 1
Disconnect the EVRV solenoid from its electrical connector.
- 2
Disconnect the vacuum line that connects to the EGR valve.
- 3
Disconnect the vacuum line that connects to the EVRV solenoid port labeled with the number 2 in the photo above.
- 4
Connect a vacuum pump to the EVRV solenoid port that you just disconnected from the vacuum line.
This is the port labeled with the number 2 in the photo above. - 5
Apply vacuum to the EVRV solenoid with the vacuum pump.
- 6
The vacuum hose that connects to the EGR valve should NOT have vacuum while you pump the vacuum pump.
NOTE: The vacuum line you're checking for vacuum is the one you disconnected in step 2.
Let's take a look at what your test results mean:
CASE 1: The EVRV solenoid is allowing vacuum to flow to the EGR valve. This test result tells you that the EVRV solenoid is stuck open.
You can conclude that the EVRV solenoid is bad and needs replacement if you have:
- Confirmed the EVRV solenoid is getting vacuum (TEST 1).
- Confirmed the EVRV solenoid is getting 12 Volts and Ground (TEST 2 and TEST 3).
- Confirmed in this test section that the EVRV solenoid is stuck open.
CASE 2: The EVRV solenoid IS NOT allowing vacuum to flow to the EGR valve. This is the correct test result.
The next step is to perform this same test but with the EVRV solenoid connected to its electrical connector. Go to: TEST 5: Is The EVRV Solenoid Stuck Open? PART 2.
TEST 5: Is The EVRV Solenoid Stuck Open? PART 2
In some cases, the EVRV solenoid will turn ON as soon as you crank and start the engine due to an electrical issue in its pigtail connector wires.
In some very rare cases, the fuel injection computer has failed and is commanding the EVRV solenoid ON when it shouldn't be.
To rule out those possibilities, we'll reconnect the EVRV solenoid to its electrical connector and see if vacuum is routed to the EGR valve with the key in the ON position but with engine off (KOEO).
The expected and correct test result is that the EVRV solenoid remains in its OFF state even when connected to its pigtail connector (and with the key in the ON position).
Let's get started:
- 1
Reconnect the EVRV solenoid to its electrical connector.
- 2
Disconnect the vacuum line that connects to the EGR valve.
- 3
Disconnect the vacuum line that connects to the EVRV solenoid valve port marked with number 2 in the photo above.
- 4
Connect a vacuum pump to the EVRV solenoid port that you just disconnected from the vacuum line.
This is the port labeled with the number 2 in the photo above. - 5
Turn the key to the ON position but don't crank or start the engine.
- 6
Apply vacuum to the EVRV solenoid with the vacuum pump.
- 7
The vacuum hose that connects to the EGR valve should NOT have vacuum while you pump the vacuum pump.
NOTE: The vacuum line you're checking for vacuum is the one you disconnected in step 2.
Let's examine your test result:
CASE 1: The EVRV solenoid is allowing vacuum to flow to the EGR valve. This test result tells you that the EVRV solenoid is open (ON) and it should not be.
The most likely cause of this problem is:
- The gray (GRY) wire has a short-to-Ground problem.
- The fuel injection computer has failed (very rare).
Although it's beyond the scope of this tutorial, your next step is to check the continuity of the GRY wire between the EVRV solenoid connector and the fuel injection computer connector.
CASE 2: The EVRV solenoid IS NOT allowing vacuum to flow to the EGR valve. This is the correct and expected test result.
Your next step is to go to: TEST 6: Energizing The EVRV Solenoid.
