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USER’S MANUAL
OBD-II Code Reader
AL309
www.Autel.us
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Table of Contents
1. Safety Precautions and Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Start-up Screen . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 3
2. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 On-Board Diagnostics (OBD) II . . . . . . . . . . . . . . . . . . . .. . . . . . . 3
2.2 Diagnostic Trouble Codes (DTCs) . . . . . . . . . . . . . . . . . .. . . . . . . 4
2.3 Location of the Data Link Connector (DLC) . . . . . . . . . . . .. . . . . . . 4
2.4 OBD II Readiness Monitors . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 5
2.5 OBD II Monitor Readiness Status . . . . . . . . . . . . . . . . . . .. . . . . . . 6
2.6 OBD II Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 7
2.7 OBD II Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 8
3. Using the Code Reader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Tool Description - AL 309 . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 10
3.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 11
3.3 Accessories Included . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 11
3.4 Navigation Characters . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 11
3.5 Vehicle Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 11
3.6 Product Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 11
3.7 Vehicle Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 14
4. OBD II Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 System Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 16
4.2 Reading Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 17
4.3 Erasing Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 18
4.4 Live Data *see appendix for PIDs and definitions. . . . . . . .. . . . . . . 19
4.5 Viewing Freeze Frame Data . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 21
4.6 Retrieving I/M Readiness Status . . . . . . . . . . . . . . . . . . .. . . . . . . 22
4.7 Viewing Vehicle Information . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 25
4.8 Exiting the OBDII Test . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 26
5. Warranty and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1 Limited One Year Warranty . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 28
5.2 Service Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 28
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
MS309 Manual_V1.01.fm Page 1 Wednesday, January 7, 2009 2:42 PM
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1. Safety Precautions and Warnings
To prevent personal injury or damage to vehicles and/or the code
reader, read this instruction manual first and observe the following
safety precautions at a minimum whenever working on a vehicle:
Always perform automotive testing in a safe environment.
Wear safety eye protection that meets ANSI standards.
Keep clothing, hair, hands, tools, test equipment, etc. away from all
moving or hot engine parts.
Operate the vehicle in a well ventilated work area: Exhaust gases are
poisonous.
Put blocks in front of the drive wheels and never leave the vehicle
unattended while running tests.
•Use extreme caution when working around the ignition coil, distributor cap,
ignition wires and spark plugs. These components create hazardous
voltages when the engine is running.
Put the transmission in PARK (for automatic transmission) or NEUTRAL
(for manual transmission) and make sure the parking brake is engaged.
Keep a fire extinguisher suitable for gasoline/chemical/ electrical fires
nearby.
Don’t connect or disconnect any test equipment while the ignition is on or
the engine is running.
Keep the code reader dry, clean, free from oil/water or grease. Use a mild
detergent on a clean cloth to clean the outside of the code reader, when
necessary.
MS309 Manual_V1.01.fm Page 2 Wednesday, January 7, 2009 2:42 PM
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1.1 Start-up Screen
This initial start-up screen appears momentarily when the tool is first plugged in.
The lower identification line reveals the version of the software. Use this version
number to verify that the tool has the most up to date software.
2. General Information
2.1 On-Board Diagnostics (OBD) II
The first generation of On-Board Diagnostics (called OBD I) was developed by the
California Air Resources Board (CARB) and implemented in 1982 to monitor some
of the emission control components on vehicles. As technology evolved and the
desire to improve the On-Board Diagnostic system increased, a new generation of
On-Board Diagnostic system was developed. This second generation of On-Board
Diagnostic regulations, which was implemented in 1996, is called "OBD II". Under
guidelines set forth by the EPA (Environmental Protection Agency) a standardized
protocol was put in place. All automobile manufacturers selling cars in the US since
1996 must comply with OBD II requirements.
The OBD II system is designed to monitor emission control systems and key
engine components by performing either continuous or periodic tests of specific
components and vehicle conditions. When a problem is detected, the OBD II
system turns on an amber warning lamp (MIL) on the vehicle instrument panel to
alert the driver typically by the phrase of “Check Engine” or “Service Engine Soon”.
The system will also store important information about the detected malfunction so
that a technician can accurately find and fix the problem. Below are three pieces of
such valuable information:
1) If the Malfunction Indicator Light (MIL) is commanded 'on' or 'off'.
2) Which, if any, Diagnostic Trouble Codes (DTCs) are stored;
3) Readiness Monitor status.
AutoLink
®
AL309 V. 1.17
MS309 Manual_V1.01.fm Page 3 Wednesday, January 7, 2009 2:42 PM
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2.2 Diagnostic Trouble Codes (DTCs)
OBD II Diagnostic Trouble Codes are codes that are stored by the on-board
computer diagnostic system in response to a problem found in the vehicle. These
codes identify a particular problem area and are intended to provide you with a
guide as to where a fault might be occurring within a vehicle. OBD II Diagnostic
Trouble Codes consist of a five-digit alphanumeric code. The first character, a
letter, identifies which control system sets the code. The other four characters, all
numbers, provide additional information on where the DTC originated and the
operating conditions that caused it to set. Here below is an example to illustrate the
structure of the digits:
2.3 Location of the Data Link Connector (DLC)
The DLC (Data Link Connector or Diagnostic Link Connector) is the standardized
16-cavity connector where diagnostic code readers interface with the vehicle's on-
board computer. The DLC is usually located beneath the dashboard, within 12
inches of the steering column on either side. It is under or around the driver’s side
for most vehicles. If Data Link Connector is not located under dashboard, a label
should be there indicating location. For some Asian and European vehicles, the
DLC is located behind the ashtray and the ashtray must be removed to access the
Systems
B=Body
C=Chassis
P=Powertrain
U=Network
Code Type
Generic (SAE):
P0,
B0,
C0 ,
U0 ,
Manufacturer Specific:
P1, P2
B1, B2
C1, C2
U1, U2
Sub-systems
1= Fuel and Air Metering
2= Fuel and Air Metering
3= Ignition System or Engine
Misfire
4= Auxiliary Emission Controls
5= Vehicle Speed Control and Idle
Controls
6= Computer Output Circuits
7= Transmission Controls
8= Transmission Controls
DTC Example
P0202
Last two digits
identify individual
component within
the
syst em.
MS309 Manual_V1.01.fm Page 4 Wednesday, January 7, 2009 2:42 PM
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drive etc.) before the monitor is ready to be tested. These monitors are termed
non-continuous monitors and are listed below:
1. EGR System - Exhaust Gas Recirculation for reducing greenhouse gases.
2. O2 Sensors - Used to monitor and adjust air/fuel mixture.
3. Catalyst - Used to reduce exhaust emissions.
4. Evaporative System - Used to monitor the integrity of fuel tank system.
5. O2 Sensor Heater - Brings 02 sensor to correct operating temperature.
6. Secondary air - Used to reduce exhaust emissions.
7. Heated Catalyst - Brings catalyst to correct operating temperature.
8. A/C system - monitors system for freon leaks.
2.5 OBD II Monitor Readiness Status
OBD II systems must indicate whether or not the vehicle’s PCM’s monitoring has
completed testing on each emission component. Components that have been OBD
II tested will be reported as “OK”. The purpose of recording readiness status is to
allow inspectors to determine if the vehicle’s OBD II system has tested all the
emissions systems. This is handy to know before bringing vehicle to a state
emissions testing facility.
The powertrain control module (PCM) sets a monitor to “OK” after an appropriate
drive cycle has been performed. The drive cycle that enables a monitor and sets
readiness codes to “OK” varies for each individual monitor. Once a monitor is set
as “OK”, it will remain in this state. A number of factors, including erasing of
diagnostic trouble codes (DTCs) with a code reader or a disconnected battery, can
result in Readiness Monitors being set to “INC” (incomplete). Since the three
continuous monitors are constantly evaluating, they will be reported as “OK” all of
the time. As long as there are no DTCs stored in memory, the vehicle is running in
accordance with the OBD II guidelines. If testing of a particular supported non-
continuous monitor has not been completed or not tested, the monitor status will be
reported as “INC” (incomplete).
In order for the OBD monitor system to become ready, the vehicle should be driven
under a variety of normal operating conditions. These operating conditions may
include a mix of highway driving and stop and go, city type driving, and at least one
overnight-off period. For specific information on getting your vehicle’s OBD monitor
system ready, please consult your vehicle owner’s manual.
MS309 Manual_V1.01.fm Page 6 Wednesday, January 7, 2009 2:42 PM
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Mode $06 - Non-Continuously Monitored Systems test results. There are
typically a minimum value, a maximum value, and a current value for each non-
continuous monitor. This data is optional, and it is defined by a given vehicle maker
if it’s used.
Mode $07 - Request for DTCs (pending) from Continuously Monitored
Systems after a single driving cycle has been performed to determine if
repair has fixed a problem. This is used by service technicians to verify repair
was performed properly and after clearing diagnostic trouble codes.
Mode $08 - This Special Control Mode requests control of the on-board
system, test, or component bi-directionally (where applicable). This mode is
manufacturer specific.
Mode $09 - Reports vehicle information. This information includes vehicle VIN
number and calibration information stored in the vehicle ECUs.
* With on-screen graphing
Table 1: Comparison of AutoLink Tool Capabilities
Mode
AutoLink
AL309
AutoLink Pro
AL510
Mode 1 *
Mode 2
Mode 3
Mode 4
Mode 5
Mode 6
Mode 7
Mode 8
Mode 9
MS309 Manual_V1.01.fm Page 9 Wednesday, January 7, 2009 2:42 PM
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3) Wait a few seconds while the code reader reads vehicle information.
4) From Vehicle Info. menu, use SCROLL button to select an available items to
view and press ENTER/EXIT button.
5) View retrieved vehicle information on the screen.
6) Press ENTER/EXIT to return to previous menu.
4.8 Exiting the OBDII Test
1) To exit OBDII test, use SCROLL button to select Exit from Diagnostic Menu
and press ENTER/EXIT button.
............Diagnostic Menu......... ..
8/8
5) View Freeze Frame
6) I/M Readiness
7) V ehicle Info.
8) Exit
MS309 Manual_V1.01.fm Page 26 Wednesday, January 7, 2009 2:42 PM
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