Toyota Land Cruiser 1988 Repair Manual page 126

EMISSION CONTROL SYSTEMS- Air Injection (AI) System EC-17
For reburning the unburnt HC and CO in the exhaust port, compressed air from the air pump is blown into the
exhaust port.
Coolant Driving
Temp. Condition
Blow 10"C
-
(50" F)
Between
15- 35"C
-
(59- ss·F)
Ex.
deceleration
Above 40"C
(1 04"F)
Deceleration
Engine Vehicle
vsv
ASV AI System
RPM
Speed
- -
OFF CLOSED OFF
-
-
ON OPEN ON
-
-
OFF
CLOSED OFF
Above 2,000 rpm
-
OFF CLOSED OFF
Blow 2,000 rpm
Above
ON OPEN
ON
6 mph (10 km/h)
INSPECTION OF AI SYSTEM
1. VISUALLY CHECK HOSES AND TUBES FOR
CRACKS. KINKS, DAMAGE OR LOOSE
CONNECTIONS
2. PREPARATION
Disconnect the air by-pass hose from the ASV.
3. CHECK ASV WITH FOLLOWING TEMPERATURE:
(a) The coolant temperature should be below 1 O"C
(50.F) or above 4o·c (104"F).
(b) Start the engine and check that air is discharged
from the ASV.
(c) The coolant temperature should be between 15•c
(59"F) and 35"C (95"F).
(d) With engine idling, check that air is not discharged
from the ASV.
(e) The coolant temperature should be between 15"C
(59.F) and 35"C (95.F).
3.~ 1 ~0
(f) Increase the engine speed to 3,000 rpm and check
~
that air is discharged from the ASV.
rpm
EC3041
INSPECTION OF AIR PUMP DRIVE BELT
(See page MA-4)