The testing procedures are a bit complicated.
1. INSPECT AND CLEAN FILTER IN EGR VACUUM MODULATOR
Remove the cap and filter.
Check the filter for contamination or damage.
Using compressed air, clean the filter.
Install the filter and cap.
HINT: Install the filter with the coarser surface facing the atmospheric side (outward).
2. INSTALL VACUUM GAUGE
Using a 3-way connector, connect a vacuum gauge to the hose between the EGR valve and EGR vacuum modulator.
3. INSPECT SEATING OF EGR VALVE
Start the engine and check that the engine starts and runs at idle.
4. INSPECT VSV OPERATION WITH COLD ENGINE
The engine coolant temperature should be below 50 C (122 F).
Check that the vacuum gauge indicates zero at 3,500 rpm.
Check that the EGR pipe is not hot.
5. INSPECT OPERATION OF VSV AND EGR VACUUM MODULATOR
If you have no TOYOTA hand-held tester, check these procedures:
Remove the 3-way connector with the vacuum hose.
Connect the vacuum hose (from port Q of EGR vacuum modulator) to the EGR valve.
Plug the vacuum hose (from VSV for EGR).
Check that the vacuum gauge indicates low vacuum at 3,500 rpm.
6. REMOVE VACUUM GAUGE
Remove the vacuum gauge, and reconnect the vacuum hoses to the proper locations.
7. INSPECT EGR VALVE
Apply vacuum directly to the EGR valve with the engine idling.
Check that the engine runs rough or dies.
Reconnect the vacuum hoses to the proper locations. If no problem is found with this inspection, system is normal; otherwise inspect each part.
8. REMOVE EGR PIPE
Remove the bolt, 4 nuts, EGR pipe and 2 gaskets.
HINT: At the time of installation, please refer to the following items.
Install 2 new gaskets.
Bolt : 18 Nm (185 kg. Cm, 13 ft. Lb)
Nut A: 19 Nm (195 kg. Cm, 14 ft. Lb)
Nut B: 20 Nm (200 kg. Cm, 15 ft. Lb)
9. REMOVE EGR VALVE
Disconnect these hoses:
Water bypass hose (from IAC valve)
Water bypass hose (from water bypass pipe)
Remove the 2 nuts, EGR valve and gasket.
Torque: 19 Nm (195 kg. Cm, 14 ft. Lb)
10. INSPECT EGR VALVE
Check for sticking and heavy carbon deposits.
If a problem is found, replace the EGR valve.
11. DISCONNECT VACUUM HOSES FROM EGR VACUUM MODULATOR
12. INSPECT EGR VACUUM MODULATOR OPERATION
Block ports P and R with your finger.
Blow air into port Q, and check that the air passes through to the air filter side freely.
Start the engine, and maintain speed at 3,500 rpm.
Repeat the above test. Check that there is a strong resistance to air flow. If operation is not as specified, replace the EGR vacuum modulator.
13. RECONNECT VACUUM HOSES TO EGR VACUUM MODULATOR
14. REMOVE CHECK VALVE
15. INSPECT CHECK VALVE
Check that air flows from the orange pipe to the black pipe.
Check that air does not flow from the black pipe to the orange pipe. If operation is not as specified, replace the check valve.
16. INSTALL CHECK VALVE
HINT: Install the check valve with the orange pipe facing the EGR vacuum modulator side.
17. INSPECT VSV FOR EGR
What I might try to simplify things is to "Tee" in a vacuum gauge at the valve feed that you can monitor while driving and when you hear the pinging, see if there is vacuum going to the valve.
Tuesday, November 3rd, 2015 AT 2:04 AM