Launch CReader 3001 User Manual (English)

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LAUNCH

3001

User’s Manual

generates a varying voltage of up to one volt, based on how much oxygen is in the

exhaust gas, and sends the signal to the computer. The computer uses this signal

to make corrections to the air/fuel mixture. If the exhaust gas has a large amount

of oxygen (a lean air/fuel mixture), the oxygen sensor generates a “low” voltage

signal. If the exhaust gas has very little oxygen (a rich mixture condition), the

oxygen sensor generates a “high” voltage signal. A 450mV signal indicates the

most efficient, and least polluting, air/fuel ratio of 14.7 parts of air to one part of

fuel.

The oxygen sensor must reach a temperature of at least 600-650°F, and the

engine must reach normal operating temperature, for the computer to enter into

closed-loop operation.

The oxygen sensor only functions when the computer is in closed-loop. A properly

operating oxygen sensor reacts quickly to any change in oxygen content in the

exhaust stream. A faulty oxygen sensor reacts slowly, or its voltage signal is weak

or missing.

The Oxygen Sensor Monitor is supported by “spark ignition” vehicles only. The

Oxygen Sensor Monitor is a “Two-Trip” monitor. If a fault is found on the first trip,

the computer temporarily saves the fault in its memory as a Pending Code. The

computer does not command the MIL on at this time. If the fault is sensed again

on the second trip, the computer commands the MIL “On,” and saves the code in

its long-term memory.

2. O2 Sensor Heater Monitor

The Oxygen Sensor Heater Monitor tests the operation of the oxygen sensor’s

heater. There are two modes of operation on a computer-controlled vehicle:

“open-loop” and “closed-loop.” The vehicle operates in open-loop when the

engine is cold, before it reaches normal operating temperature. The vehicle also

goes to open-loop mode at other times, such as heavy load and full throttle

conditions. When the vehicle is running in open-loop, the oxygen sensor signal is

ignored by the computer for air/fuel mixture corrections. Engine efficiency during

open-loop operation is very low, and results in the production of more vehicle

emissions.

Closed-loop operation is the best condition for both vehicle emissions and vehicle

operation. When the vehicle is operating in closed-loop, the computer uses the

oxygen sensor signal for air/fuel mixture corrections.

In order for the computer to enter closed-loop operation, the oxygen sensor must

reach a temperature of at least 600°F. The oxygen sensor heater helps the

oxygen sensor reach and maintain its minimum operating temperature (600°F)

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Launch CReader 3001 Specifications

General

Screen Resolution	320 x 240 pixels
Display	2.4 inch TFT color display
Connectivity	USB
Power Source	9V - 18V via OBD II port
Supported Protocols	J1850 VPW, J1850 PWM, and CAN
Compatibility	Compatible with most 1996 and newer OBD II & CAN compliant vehicles
Functions	Read Codes, Erase Codes, I/M Readiness, Data Stream, Freeze Frame, Vehicle Information
Update Method	USB update
Languages	English, French, Spanish, German, Russian, Portuguese