Toyota T100 1996 Service Manual page 960

EC−10
1996 TOYOTA T100 (RM449U)
EMISSION CONTROL (5VZ−FE)
(d)
HINT:
As exhaust gas is increasingly recirculated, the engine will start
to misfire.
7.
Remove the SST from the DLC1.
8.
Remove the vacuum gauge, and reconnect the vacuum hoses
to their proper locations.
9.
(a)
(b)
(c)
If no problem is found during this inspection, system is normal;
otherwise inspect each part.
P23555
10.
Disconnect these vacuum hoses:
P23551
11.
(a)
(b)
P23556
(c)
(d)
12.
Connect these vacuum hoses:
P23557
− EXHAUST GAS RECIRCULATION (EGR) SYSTEM
Check that the vacuum gauge indicates high vacuum at
3,500 rpm.
DISCONNECT TERMINALS TE1 AND E1
SST 09843−18020
REMOVE VACUUM GAUGE
INSPECT EGR VALVE
Apply vacuum directly to the EGR valve with the engine
idle.
Check that the engine runs rough or dies.
Reconnect the vacuum hoses to their proper locations.
DISCONNECT VACUUM HOSES FROM EGR VACUUM
MODULATOR
(1) Vacuum hose from R port
(2) Vacuum hose from Q port
(3) Vacuum hose from P port
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 resis-
tance to air flow.
RECONNECT VACUUM HOSES TO EGR VACUUM
MODULATOR
(1) Vacuum hose to R port
(2) Vacuum hose to Q port
(3) Vacuum hose to P port