Equus 8366 - 2 Air/Fuel Ratio Gauge - Manual (Page 2)

© 2004 IEC - All Rights Reserved
GAUGE CONNECTION (continued)
4
The Manufacturer warrants to the original purchaser that this unit is free of defects in
materials and workmanship under normal use and maintenance for a period of one (1)
year from the date of original purchase. If the unit fails within the one (1) year period, it
will be repaired or replaced, at the Manufacturer's option, at no charge, when returned
prepaid to the Technical Service Center with Proof of Purchase. The sales receipt may
be used for this purpose. Installation labor is not covered under this warranty.
All replacement parts, whether new or re-manufactured, assume as their warranty
period for only the remaining time of this warranty. This warranty does not apply to
damage caused by improper use, accident, abuse, improper voltage, service, fire,
flood, lightning, or other acts of God, or if the product was altered or repaired by any-
one other than the Manufacturer's Technical Service Center. Consequential and inci-
dental damages are not recoverable under this warranty. Some states do not allow
the exclusion or limitation of incidental or consequential damages, so the above lim-
itation or exclusion may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights,
which vary from state to state. No portion of this warranty may be copied or dupli-
cated without the expressed written permission from the Manufacturer.
Obtaining Warranty Service:
Products requiring service should be returned as follows:
1. Call the Technical Service Center to obtain a Return Reference Number:
USA & Canada = 1-800-544-4124
Other = 714-241-6805
2. Package the product carefully to prevent shipping damage
3. Include your name, return address, and a day contact phone
4. Enclose a copy of the dated sales receipt
5. Describe the problem
6. Ship prepaid to: Technical Service Center, 17291 Mt. Herrmann Street, Fountain
Valley, CA 92708 U.S.A.
Phone: 1-800-544-4124 or 714-241-6805 Fax: 714-432-7910
Web: www.iEQUUS.com Email: [email protected]
LIMITED WARRANTY AND SERVICE PROCEDURES
S S
Figure 3. Air/Fuel Ratio Gauge Connections
The Air/Fuel Ratio Gauge face has two columns of 10 colored LEDs.
Each LED lights in response to a specific output voltage signal level
from the oxygen sensor(s). The LED colors represent the current
air/fuel ratio condition; Red to indicate a LEAN condition, Green to
indicate OPTIMAL, and Yellow to indicate a RICH condition.
The Air/Fuel Ratio Gauge indication should change, depending on the
current driving conditions, as described below:
■ ■ At engine warm up, the engine runs in a RICH mode until the oxy-
gen sensor reaches operating temperature. The oxygen sensor
does not operate until it reaches a minimum of 600° F.
■ ■ At cruising speed, the oxygen sensor output voltage continually
fluctuates up and down. The gauge LEDs light accordingly, cycling
between slightly lean and slightly rich. This condition is considered
OPTIMAL (normal) operation.
■ ■ When the vehicle is accelerated rapidly, the vehicle’s computer
enriches the air/fuel mixture. The gauge indicates this very rich
condition by gravitating mostly into the RICH (Yellow LEDs) area..
■ ■ On deceleration, the computer cuts most of the fuel to the engine.
The gauge indicates this very lean condition by gravitating towards
the LEAN (Red LEDs) area.
IMPORTANT: The four operating conditions described above rep-
resent a normally operating engine and engine management sys-
tem. These conditions are considered normal. If a condition
GAUGE OPERATION (See Figure 4) 5
exists where the engine runs in the RICH or LEAN area most of
the time, even at cruising speed, a problem may be indicated.
Visually inspect components in the engine compartment for
defective or disconnected vacuum hoses, or broken compo-
nents. See your vehicle’s repair manual to conduct appropriate
tests related to that particular condition.
Figure 4. Gauge Operation