Toyota Supra 1990 Manual page 165

EMISSION CONTROL SYSTEMS - Exhaust Gas Recirculation (EGR) System (7M-GE) EC-13
COLD
2,500 rpm
Tachometer
HOT
2,500 rpm
Tachometer
To Intake
Manifold
EC2011
Vacuum Gauge
EC2109
No Vacuum
Vacuum Gauge
ECQ137 ECQ128
Low Vacuum
Vacuum Gauge
ECQ137 ECQ129
Vacuum Gauge
EC3316
INSPECTION OF EGR SYSTEM
1. CHECK AND CLEAN FILTER IN EGR VACUUM
MODULATOR
2.
3.
(a) Check the filter for contamination or damage.
(b) Using compressed air, clean the filter.
PREPARATION
Using a 3-way connector, connect a vacuum gauge to the
hose between the EGR valve and EGR vacuum modulator.
CHECK SEATING OF EGR VALVE
Start the engine and check that the engine starts and runs
at idle.
4. CHECK VSV WITH COLD ENGINE
(a) The coolant temperature should be below 57°C
( 135°F).
(b) Check that the vacuum gauge indicates is zero at
2,500 rpm.
5. CHECK VSV AND EGR VACUUM MODULATOR WITH
WARM ENGINE
(a) Warm up the engine.
(b) Check that the vacuum gauge indication is approx.
70 mmHg (2.76 in.Hg, 9.3 kPa) at 2,500 rpm.
(c) Check that the vacuum gauge indication is zero at idle.
(d) Disconnect the vacuum hose from R port of the EGR
vacuum modulator and connect R port directly to the
intake manifold with another hose.
(e) Check that the vacuum gauge indicates high vacuum
at 2,500 rpm.
HINT: As a large amount of EGR gas enters, the engine
will misfire slightly.
(f) Disconnect the vacuum gauge and reconnect the
vacuum hoses to the proper locations.