Toyota 4-Runner 1985 Repair Manual page 101

EC-1
EMISSION CONTROL SYSTEMS
Page
EFI ENGINE
SYSTEM PURPOSE.............................................. EC-2
COMPONENT LAYOUT AND SCHEMATIC
DRAWiNG....................................................... EC-3
POSITIVE CRANKCASE VENTILATION (PCV)
SySTEM......................................................... EC-4
FUEL EVAPORATIVE EMISSION CONTROL
(EVAP) SySTEM.............................................. EC-6
DASH POT (DP) SySTEM..................................... EC-8
EXHAUST GAS RECIRCULATION (EGR)
SySTEM......................................................... EC-11
THREE-WAY CATALYST (TWC) SYSTEM .............. EC-14
CARBURETOR ENGINE
SYSTEM PURPOSE.............................................. EC-16
COMPONENT LAYOUT AND SCHEMATIC
DRAWiNG....................................................... EC-17
POSITIVE CRANKCASE VENTILATION (PCV)
SySTEM................ ......................................... EC-19
FUEL EVAPORATIVE EMISSION CONTROL
(EV AP) SySTEM.............................................. EC-21
MIXTURE CONTROL (MC) SYSTEM ...................... EC-26
DASH POT (DP) SySTEM..................................... EC-28
EXHAUST GAS RECIRCULATION (EGR)
SySTEM......................................................... EC-30
AIR SUCTION AND FUEL SYSTEM
FEEDBACK CONTROL SySTEM......................... EC-36
AIR SUCTION (AS) SYSTEM ................................ EC-43
THREE-WAY CATALYST (TWC) SySTEM.............. EC-46
OXIDATION CATALYST (OC) SySTEM.................. EC-46
HIGH ALTITUDE COMPENSATION (HAC)
SYSTEM ......................................................... EC-48
AUXILIARY SySTEMS......................................... EC-53
1. Automatic Hot Air Intake (HAl) System........ EC-53
2. Automatic Choke System........................... EC-55
3. Choke Breaker (CB) System ........................ EC-57
4. Choke Opener System............................... EC-58
5. Auxiliary Acceleration Pump (AAP) System .. EC-61
6. Deceleration Fuel Cut System ..................... EC-63
7. Idle Advance System................................. EC-66
8. Cold Mixture Heater (CMH) System ............. EC-68
NOTE: TROUBLESHOOTING
See page EM-2 (for EFI Engine)
See page EM-5 (for Carbo Engine)
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