Toyota Land Cruiser 1988 Repair Manual page 124

EMISSION CONTROL SYSTEMS- Exhaust Gas Recirculation (EGR) System EC-15
INSPECTION OF EGR VALVE
1. REMOVE EGR VALVE
Check the valve for sticking and heavy carbon deposits.
If a problem is found, replace it.
2. REINSTALL EGR VALVE WITH NEW GASKET
INSPECTION OF WATER TEMPERATURE
SENSOR
(See page Fl-77)
INSPECTION OF THROTTLE POSITION
SENSOR
(See page Fl-68)
INSPECTION OF AIR FLOW METER
(See page Fl-66)