Emission Control System - Update
84mitsubishi03SUBJECT:
EMISSION CONTROL SYSTEM UPDATE
NO. STB-84-25-004
DATE December 1984
MODEL 1985 Cordia/Tredia
DESCRIPTION
This bulletin is issued to update the SECONDARY AIR SUPPLY SYSTEM description on Page 25-7 of the 1985 Cordia/Tredia Service Manual. The text and illustrations in this bulletin supersede those in the Service Manual. As reference to this bulletin, please write its number in the box on that page:
STB Revision - STB-84-25-004
CORRECTION - PAGE 25-7
Cross out the text and illustrations as shown below. The correct text and illustrations appear on page 2 of this bulletin.
CORRECTED TEXT AND ILLUSTRATIONS FOR PAGE 25-7,1985 CORDIA/TREDIA SERVICE MANUAL
SECONDARY AIR SUPPLY SYSTEM
Reed Valve (For Federal FBC System Vehicles)
The air injection system consists of a reed valve with a secondary air control valve, and a solenoid valve, ECU and some sensors.
The reed valve supplies secondary air to the front catalytic converter for the purpose of promoting oxidation of exhaust emissions during engine warmup, vehicle deceleration, and heavy engine load operation. The reed valve is actuated by exhaust vacuum generated from pulsations in the exhaust manifold, and extra air is supplied into the exhaust manifold through the secondary air control valve.
The secondary air control valve is opened by intake manifold pressure when the solenoid valve is energized by the ECU based on information from coolant temperature, engine speed, time, throttle position and idle position sensors.
Reed Valve (For California FBC System Vehicles)
The air injection system consists of a reed valve with a secondary air control valve, a solenoid valve, ECU and some sensors.
The reed valve supplies secondary air to the front catalytic converter for the purpose of promoting oxidation of exhaust emissions during engine warmup and vehicle deceleration.
The reed valve is actuated by exhaust vacuum generated from pulsations in the exhaust manifold, and extra air is supplied into the exhaust manifold through the secondary air control valve.
The secondary air control valve is opened by the intake manifold pressure when the solenoid valve is energized by the ECU based on the information from coolant temperature, engine speed, time, throttle position and idle position sensors.