6E2-2 ENGINE AND EMISSION CONTROL SYSTEM (SEQUENTIAL MULTIPORT FUEL INJECTION FOR H27 ENGINE)
Fuel injector.......................................... 6E2-26
Electronic Control System........................ 6E2-31
Engine control module (ECM)/
powertrain control module (PCM) ........ 6E2-31
Mass air flow sensor (MAF sensor)...... 6E2-32
Intake air temperature (IAT) sensor ..... 6E2-34
Throttle position sensor (TP sensor) .... 6E2-35
Engine coolant temperature sensor
(ECT sensor) ........................................ 6E2-36
Heated oxygen sensor (sensor 1) ........ 6E2-37
Heated oxygen sensor (sensor 2) ........ 6E2-38
Vehicle speed sensor (VSS) ................ 6E2-39
Manifold absolute pressure sensor ...... 6E2-39
Fuel level sensor (sender gauge)......... 6E2-41
Crankshaft position sensor................... 6E2-41Main relay ............................................ 6E2-41
Fuel pump relay ................................... 6E2-42
Fuel cut operation ................................ 6E2-43
Emission Control System......................... 6E2-44
EGR system (if equipped) .................... 6E2-44
EVAP canister ...................................... 6E2-45
Vacuum passage ................................. 6E2-46
PCV System ............................................ 6E2-47
PCV hose ............................................. 6E2-47
PCV valve ............................................ 6E2-47
PCV system ......................................... 6E2-48
Tightening Torque Specification.............. 6E2-48
Special Tool ............................................... 6E2-48
General Description
The engine and emission control system has 4 major sub-systems: air intake system, fuel delivery system, elec-
tronic control system and emission control system.
Air intake system includes air cleaner, mass air flow sensor, throttle body, idle air control valve and intake man-
ifold.
Fuel delivery system includes fuel pump, delivery pipe, fuel pressure regulator, fuel injectors, etc.
Electronic control system includes ECM (PCM), various sensors and controlled devices.
Emission control system includes EGR, EVAP and PCV systems.
ENGINE AND EMISSION CONTROL SYSTEM (SEQUENTIAL MULTIPORT FUEL INJECTION FOR H27 ENGINE) 6E2-47
PCV System
PCV hose
INSPECTION
Check hoses for connection, leakage, clog, and deterioration.
Replace as necessary.
PCV valve
ON-VEHICLE INSPECTION
1) Disconnect PCV valve from cylinder head cover and plug
head cover hole.
2) Run engine at idle.
3) Place your finger over end of PCV valve (1) to check for vac-
uum. If there is no vacuum, check for clogged valve. Replace
as necessary.
4) After checking vacuum, stop engine and remove PCV valve
(1). Shake valve and listen for the rattle of check needle
inside the valve (1). If valve does not rattle, replace.
5) After checking, connect PCV valve (1), PCV hose and clamp
securely. NOTE:
Be sure to check that there is no obstruction in PCV
valve or its hoses before checking engine idle speed/IAC
duty for obstructed PCV valve or hose hampers its accu-
rate checking.
