Introduction WHAT IS OBD? WHAT IS OBD? The Enhanced OBD2 Scan Tool is designed to work on all OBD2 compliant vehicles. All 1996 and newer vehicles (cars, light trucks and SUVs) sold in the United States are OBD2 compliant. One of the most exciting improvements in the automobile industry was the addition of on- board diagnostics (OBD) on vehicles, or in more basic terms, the computer that activates the...
You Can Do It! EASY TO USE - EASY TO VIEW - EASY TO DEFINE Easy To Use ..Connect the Scan Tool to the vehicle’s test connector. Turn the ignition key "On.” The tool will automatically link to the vehicle’s computer.
Safety Precautions SAFETY FIRST! SAFETY FIRST! To avoid personal injury, instrument damage and/or damage to your vehicle; do not use the OBD2 Scan Tool before reading this manual. This manual describes common test procedures used by experienced service technicians. Many test procedures require precautions to avoid accidents that can result in personal injury, and/or damage to your vehicle or test equipment.
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Safety Precautions SAFETY FIRST! To prevent damage to the on-board computer when taking vehicle electrical measurements, always use a digital multimeter with at least 10 megOhms of impedance. Fuel and battery vapors are highly flammable. To prevent an explosion, keep all sparks, heated items and open flames away from the battery and fuel / fuel vapors.
About the Scan Tool VEHICLES COVERED VEHICLES COVERED The Enhanced OBD2 Scan Tool is designed to work on all OBD2 compliant vehicles. All 1996 and newer vehicles (cars and light trucks) sold in the United States are OBD2 compliant. Federal law requires that all 1996 and newer cars and light trucks sold in the United States must be OBD2 compliant;...
About the Scan Tool BATTERY REPLACEMENT On some Asian and European vehicles the DLC is located behind the “ashtray” (the ashtray must be removed to access it) or on the far left corner of the dash. If the DLC cannot be located, consult the vehicle’s service manual for the location.
Scan Tool Controls CONTROLS AND INDICATORS CONTROLS AND INDICATORS Figure 1. Controls and Indicators See Figure 1 for the locations of items 1 through 12, below. ERASE button - Erases Diagnostic Trouble Codes (DTCs), and “Freeze Frame” data from your vehicle’s computer, and resets Monitor status.
Scan Tool Controls DISPLAY FUNCTIONS DOWN button - When in MENU mode, scrolls DOWN through the menu and submenu selection options. When LINKED to a vehicle, scrolls DOWN through the current display screen to display any additional data. UP button - When in MENU mode, scrolls UP through the menu and submenu selection options.
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Scan Tool Controls DISPLAY FUNCTIONS 2. Monitor icons - Indicate which Monitors are supported by the vehicle under test, and whether or not the associated Monitor has run its diagnostic testing (Monitor status). When a Monitor icon is solid, it indicates that the associated Monitor has completed its diagnostic testing.
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Scan Tool Controls DISPLAY FUNCTIONS If “01” is a “Pending” code, there may or may not be “Freeze Frame” data stored in memory. 14. Code Enumerator - Indicates the total number of codes retrieved from the vehicle’s computer. OBD2...
Onboard Diagnostics COMPUTER ENGINE CONTROLS COMPUTER ENGINE CONTROLS The Introduction of Electronic Engine Controls Electronic Computer Control Systems make it possible for vehicle manufacturers to comply with the tougher emissions and fuel efficiency standards mandated by State and Federal Governments. As a result of increased air pollution (smog) in large cities, such as Los Angeles, the California Air Resources Board (CARB) and the Environmental Protection Agency (EPA)
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Onboard Diagnostics COMPUTER ENGINE CONTROLS The Basic Engine Computer Control System The Computer Control System consists of an on-board computer and several related control devices (sensors, switches, and actuators). The on-board computer is the heart of the Computer Control System. The computer contains several programs with preset reference values for air/fuel ratio, spark or ignition timing, injector pulse width, engine speed, etc.
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Onboard Diagnostics COMPUTER ENGINE CONTROLS Vehicle operating conditions are constantly changing. The computer continuously makes adjustments or corrections (especially to the air/fuel mixture and spark timing) to keep all the engine systems operating within the preset reference values. On-Board Diagnostics - First Generation (OBD1) With the exception of some 1994 and 1995 vehicles, most vehicles from 1982 to 1995 are equipped with some type of first generation On-Board Diagnostics.
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Onboard Diagnostics COMPUTER ENGINE CONTROLS Because OBD1 systems only detect failed components, the degraded components were not setting codes. Some emissions problems related to degraded components only occur when the vehicle is being driven under a load. The emission checks being conducted at the time were not performed under simulated driving conditions.
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Onboard Diagnostics COMPUTER ENGINE CONTROLS Powertrain Control Module (PCM) - The PCM is the OBD2 accepted term for the vehicle’s “on-board computer.” In addition to controlling the engine management and emissions systems, also participates in controlling the powertrain (transmission) operation. Most PCMs also have the ability to communicate with other computers on the vehicle (ABS, ride control, body, etc.).
Onboard Diagnostics DIAGNOSTIC TROUBLE CODES (DTCs) OBD2 Drive Cycle - An OBD2 Drive Cycle is an extended set of driving procedures that takes into consideration the various types of driving conditions encountered in real life. These conditions may include starting the vehicle when it is cold, driving the vehicle at a steady speed (cruising), accelerating, etc.
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Onboard Diagnostics DIAGNOSTIC TROUBLE CODES (DTCs) Manufacturer-Specific DTCs are codes that are controlled by the vehicle manufacturers. The Federal Government does not require vehicle manufacturers to go beyond the standardized generic DTCs in order to comply with the new OBD2 emissions standards.
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Onboard Diagnostics DIAGNOSTIC TROUBLE CODES (DTCs) DTCs and MIL Status When the vehicle’s on-board computer detects a failure in an emissions-related component or system, the computer’s internal diagnostic program assigns a diagnostic trouble code (DTC) that points to the system (and subsystem) where the fault was found.
Onboard Diagnostics OBD2 MONITORS If the conditions that caused the MIL to light are no longer present for the next three trips in a row, the computer automatically turns the MIL “Off” if no other emissions-related faults are present. However, the DTCs remain in the computer’s memory as a history code for 40 warm-up cycles (80 warm-up cycles for fuel and misfire faults).
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Onboard Diagnostics OBD2 MONITORS Non-Continuous Monitors The other twelve Monitors are “non-continuous” Monitors. “Non- continuous” Monitors perform and complete their testing once per trip. The “non-continuous” Monitors are: Oxygen Sensor Monitor Oxygen Sensor Heater Monitor Catalyst Monitor Heated Catalyst Monitor EGR System Monitor EVAP System Monitor Secondary Air System Monitor...
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Onboard Diagnostics OBD2 MONITORS Fuel System Monitor - This Monitor uses a Fuel System Correction program, called Fuel Trim, inside the on-board computer. Fuel Trim is a set of positive and negative values that represent adding or subtracting fuel from the engine. This program is used to correct for a lean (too much air/not enough fuel) or rich (too much fuel/not enough air) air-fuel mixture.
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Onboard Diagnostics OBD2 MONITORS the downstream sensor signal voltage becomes almost the same as the upstream sensor signal. In this case, the monitor fails the test. The Catalyst Monitor is supported by “spark ignition” vehicles only. The Catalyst 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.
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Onboard Diagnostics OBD2 MONITORS into the engine where the vapors are burned. The EVAP Monitor checks for proper fuel vapor flow to the engine, and pressurizes the system to test for leaks. The computer runs this Monitor once per trip. The EVAP Monitor is supported by “spark ignition”...
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Onboard Diagnostics OBD2 MONITORS 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.
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Onboard Diagnostics OBD2 MONITORS NOx Aftertreatment Monitor - NOx aftertreatment is based on a catalytic converter support that has been coated with a special washcoat containing zeolites. NOx Aftertreatment is designed to reduce oxides of nitrogen emitted in the exhaust stream. The zeolite acts as a molecular "sponge"...
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Onboard Diagnostics OBD2 MONITORS PM Filter Monitor - The particulate matter (PM) filter removes particulate matter from the exhaust stream by filtration. The filter has a honeycomb structure similar to a catalyst substrate, but with the channels blocked at alternate ends. This forces the exhaust gas to flow through the walls between the channels, filtering the particulate matter out.
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Onboard Diagnostics OBD2 MONITORS Name of Monitor Comprehensive Continuous Component Monitor Misfire Monitor 3 - similar Continuous (Type 1 and 3) conditions Misfire Monitor 3 - similar Continuous (Type 2) conditions Fuel System Monitor 3 - similar Continuous 1 or 2 conditions Catalytic Converter Once per...
Preparation for Testing PRELIMINARY VEHICLE DIAGNOSTIC WORKSHEET PRELIMINARY VEHICLE DIAGNOSTIC WORKSHEET The purpose of this form is to help you gather preliminary information on your vehicle before you retrieve codes. By having a complete account of your vehicle's current problem(s), you will be able to systematically pinpoint the problem(s) by comparing your answers to the fault codes you retrieve.
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Preparation for Testing PRELIMINARY VEHICLE DIAGNOSTIC WORKSHEET WHEN DID YOU FIRST NOTICE THE PROBLEM: Just Started Started Last Week Started Last Month Other: LIST ANY REPAIRS DONE IN THE PAST SIX MONTHS: PROBLEMS STARTING No symptoms Cranks, but will not start Will not crank Starts, but takes a long time...
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Preparation for Testing PRELIMINARY VEHICLE DIAGNOSTIC WORKSHEET AUTOMATIC TRANSMISSION PROBLEMS (if applicable) No symptoms Vehicle does not move when in gear Shifts too early or too late Jerks or bucks Changes gear incorrectly PROBLEM OCCURS Morning Afternoon Anytime ENGINE TEMPERATURE WHEN PROBLEM OCCURS Cold Warm DRIVING CONDITIONS WHEN PROBLEM OCCURS...
Preparation for Testing BEFORE YOU BEGIN BEFORE YOU BEGIN The Enhanced OBD2 Scan Tool aids in monitoring electronic- and emissions-related faults in your vehicle and retrieving fault codes related to malfunctions in these systems. Mechanical problems such as low oil level or damaged hoses, wiring or electrical connectors can cause poor engine performance and may also cause a fault code to set.
Preparation for Testing VEHICLE SERVICE MANUALS VEHICLE SERVICE MANUALS Always refer to the manufacturer’s service manual for your vehicle before performing any test or repair procedures. Contact your local car dealership, auto parts store or bookstore for availability of these manuals.
Using the Scan Tool CODE RETRIEVAL PROCEDURE CODE RETRIEVAL PROCEDURE Retrieving and using Diagnostic Trouble Codes (DTCs) for troubleshooting vehicle operation is only one part of an overall diagnostic strategy. Never replace a part based only on the DTC definition. Each DTC has a set of testing procedures, instructions and flow charts that must be followed to confirm the location of the problem.
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Using the Scan Tool CODE RETRIEVAL PROCEDURE If the unit does not power on automatically when connected to the vehicle’s DLC connector, it usually indicates there is no power present at the vehicle’s DLC connector. Check your fuse panel and replace any burned-out fuses. If replacing the fuse(s) does not correct the problem, consult your vehicle’s repair manual to identify the proper computer (PCM) fuse/circuit, and perform any necessary repairs before...
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Using the Scan Tool CODE RETRIEVAL PROCEDURE The Scan Tool will display a code only if codes are present in the vehicle’s computer memory. If no codes are present, the message “No Powertrain DTCs or Freeze Frame Data presently stored vehicle’s computer.
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Using the Scan Tool CODE RETRIEVAL PROCEDURE The green, yellow and red LEDs are used (with the display) as visual aids to make it easier to determine engine system conditions. Green LED – Indicates that all engine systems “OK” operating normally. All monitors supported by the vehicle have run performed their...
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Using the Scan Tool CODE RETRIEVAL PROCEDURE DTC’s that start with “P1” and some “P3” are Manufacturer specific codes and their code definitions vary with each vehicle manufacturer. When a Manufacturer specific DTC is retrieved, the LCD display shows a list of vehicle manufacturers.
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Using the Scan Tool CODE RETRIEVAL PROCEDURE record saved is called Freeze Frame data. Saved engine conditions include, but are not limited to: engine speed, open or closed loop operation, fuel system commands, coolant temperature, calculated load value, fuel pressure, vehicle speed, air flow rate, and intake manifold pressure.
Using the Scan Tool THE ENHANCED MAIN MENU THE ENHANCED MAIN MENU Following the code retrieval procedure (see CODE RETRIEVAL PROCEDURE on page 33), when the last retrieved DTC has been displayed and the DTC/FF button is pressed, the Scan Tool enters the “enhanced”...
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Using the Scan Tool VIEWING ENHANCED DTCs Chrysler/Jeep Enhanced DTCs When the Scan Tool enters the “enhanced” mode (and Chrysler/Jeep is selected, if prompted), the Chrysler Enhanced menu displays. You may view either “Engine DTCs” or “Transmission DTCs.” 1. Use the UP and DOWN buttons, as necessary, to highlight the desired...
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Using the Scan Tool VIEWING ENHANCED DTCs The Scan Tool will display a code only if codes are present in the vehicle’s computer memory. If no codes are present, a “No Enhanced DTC’s are presently stored in the vehicle’s computer” is displayed. Press the LD/M button to return to the Chrysler Enhanced menu.
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Using the Scan Tool VIEWING ENHANCED DTCs - Verify the ignition is ON, then press the ENTER button to continue. If the KOER Test was selected, and the vehicle’s engine is not running, an advisory message shows on the Scan Tool’s display. - Press the LD/M button to return to the Ford/Mazda Enhanced...
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Using the Scan Tool VIEWING ENHANCED DTCs In the case of long code definitions, or when viewing Freeze Frame data, a small arrow is shown in the upper/lower right-hand corner of the code display area to indicate the presence of additional information. Use buttons, as necessary, to view the additional information.
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Using the Scan Tool VIEWING ENHANCED DTCs If the Scan Tool fails to link to the vehicle’s computer, “Linking Failed” message shows on the Scan Tool’s display. - Verify the ignition is ON, then press the ENTER button to continue. 2.
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Using the Scan Tool VIEWING ENHANCED DTCs To view additional enhanced DTCs, repeat steps 1 through 4, above. To exit the enhanced mode, use the UP and DOWN buttons, as necessary, to select Exit from the GM/Isuzu Enhanced menu, then press the ENTER button.
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Using the Scan Tool VIEWING ENHANCED DTCs In the case of long code definitions, or when viewing Freeze Frame data, a small arrow is shown in the upper/lower right-hand corner of the code display area to indicate the presence of additional information. Use buttons, as necessary, to view the additional information.
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Using the Scan Tool VIEWING ENHANCED DTCs A “One moment please” message displays, while the Scan Tool retrieves the selected DTCs. If the Scan Tool fails to link to the vehicle’s computer, “Linking Failed” message shows on the Scan Tool’s Display. - Verify the ignition is ON, then press the ENTER button to...
Using the Scan Tool ERASING DIAGNOSTIC TROUBLE CODES (DTCs) To view additional enhanced DTCs, repeat steps 1 through 4, above. To exit the enhanced mode, use the UP and DOWN buttons, as necessary, to select Exit from the Toyota/Lexus Enhanced menu, then press the ENTER button.
Using the Scan Tool I/M READINESS TESTING 3. Press and release the ERASE button. A confirmation message shows on the display. If you are sure you want to proceed, use the UP and DOWN buttons, as necessary, to highlight Yes, then press the ENTER button to erase DTCs from the vehicle’s computer.
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Using the Scan Tool I/M READINESS TESTING Emissions tests vary depending on the geographic or regional area in which the vehicle is registered. If the vehicle is registered in a highly urbanized area, the I/M 240 is probably the type of test required. If the vehicle is registered in a rural area, the stricter “dynamometer type”...
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Using the Scan Tool I/M READINESS TESTING If a Monitor has not yet met all the conditions required for it to perform the self-diagnosis and testing of its assigned engine system; it means the Monitor "HAS NOT RUN.” The Monitor Run/Not Run status does not show whether or not a problem exists in a system.
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Using the Scan Tool I/M READINESS TESTING Perform the CODE RETRIEVAL PROCEDURE as described on page 33, then interpret the LED indications as follows: Interpreting I/M Readiness Test Results 1. GREEN LED - Indicates that all engine systems "OK" operating normally (all Monitors supported by the vehicle have run and performed their self-diagnostic testing).
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Using the Scan Tool I/M READINESS TESTING 3. RED LED - Indicates there is a problem with one or more of the vehicle's systems. A vehicle displaying a red LED is definitely not ready for an Emissions Test (Smog Check). The red LED is also indication that...
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Using the Scan Tool I/M READINESS TESTING Each DTC is associated with a specific Monitor. Consult the vehicle's service manual to identify the Monitor (or Monitors) associated with the faults that were repaired. Follow the manufacturer's procedures to perform a Trip Drive Cycle for the appropriate Monitors.
Live Data Mode VIEWING LIVE DATA The OBD2 Scan Tool is a special diagnostic tool that communicates with the vehicle's computer. The Scan Tool lets you view and/or "capture" (record) "real-time" Live Data. This information includes values (volts, rpm, temperature, speed etc.) and system status information (open loop, closed loop, fuel system status, etc.) generated by the various vehicle sensors, switches and actuators.
Live Data Mode CUSTOMIZING LIVE DATA (PIDs) 5. A vehicle usually supports several PIDs, however, only a limited amount of PID data can be displayed on the screen at one time. If additional PID data is available, a small arrow will be shown on the display.
Live Data Mode RECORDING (CAPTURING) LIVE DATA 1. While linked to the vehicle, start the engine, then press and release the LD/M button. The “Mode Selection Menu” displays. 2. Use the UP and DOWN buttons, as necessary, to highlight Live Data, then press the ENTER button.
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Live Data Mode RECORDING (CAPTURING) LIVE DATA There are two ways that the Scan Tool can "record" Live Data: Record by DTC Trigger Record by Manual Trigger If the POWER/LINK button is pressed at any time while in Live Data mode, any stored (recorded) Live Data will be cleared (erased) from the Scan Tool’s memory.
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Live Data Mode RECORDING (CAPTURING) LIVE DATA The Scan Tool is capable of recording approximately 100 frames of Live Data. Record by DTC trigger lets you select the point in time at which you wish the Scan Tool to begin recording Live Data. You can set the trigger point to record the 100 frames of data before an event (when the DTC sets), after the event, or in the middle (50 frames before and 50 frames after the event.
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Live Data Mode RECORDING (CAPTURING) LIVE DATA 9. You can exit the "Record Live Data Mode" at any time by pressing and holding the LD/M button until the "Mode Selection Menu" displays. If desired, you can transfer the recorded Live Data information to a personal computer with the use of optional software (see instructions included with the software for more information).
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Live Data Mode RECORDING (CAPTURING) LIVE DATA Beginning - records approximately 100 frames of Live Data after the ENTER button was pressed. Middle - records approximately 50 frames of Live Data before and 50 frames after the ENTER button was pressed. End - records approximately 100 frames of Live Data before the ENTER button was pressed.
Live Data Mode LIVE DATA PLAYBACK Important Information 1. When Live Data capture is initiated, the green, yellow and red LEDs on the Scan Tool will flash three times to indicate that Live Data is being saved to the Scan Tool's memory. 2.
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Live Data Mode LIVE DATA PLAYBACK If there is no Live Data currently stored in the Scan Tool's memory, an advisory message shows on the display. Press the DTC/FF button to exit the "Live Data Playback" mode. 3. When you have viewed all PID information for the current frame of Live Data, use the DOWN button to scroll to the end of the PID list.
Additional Tests SPECIAL TEST MENU In addition to retrieving Diagnostic Trouble Codes (DTCs) and viewing Live Data, you can use the Scan Tool to perform additional diagnostic tests, to view diagnostic and vehicle information stored in your vehicle's on-board computer, and to configure the Scan Tool for your particular needs. SPECIAL TEST MENU Additional tests are accessed through the “Special...
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Additional Tests SPECIAL TEST MENU X or XX - These characters identify the location of the O2 sensor in relation to a cylinder bank. An O2 sensor for cylinder bank 1 is identified by the designation “1” or "B1"; a sensor for cylinder bank 2 is identified as “2”...
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Additional Tests SPECIAL TEST MENU 6. Repeat steps 3 through 5 to view test results for additional sensors. When you have finished viewing the retrieved test data, scroll to the end of the display to select Exit, then press the ENTER button to return to the “Special Test Menu”...
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Additional Tests SPECIAL TEST MENU Min or Max test limit Only one test limit, either Min or Max, is shown for any given test. Test Value and status Status is calculated by the Scan Tool by comparing the Test Value against the displayed test limit (either Min or Max). Status is shown as either Low, High or OK.
Additional Tests VIEWING VEHICLE INFORMATION VIEWING VEHICLE INFORMATION The Vehicle Info function offers three options for retrieving reference information for the vehicle under test; Vehicle ID, Available Modules and IPT (In-Use Performance Tracking). Retrieving Vehicle ID Information The Vehicle ID function is applicable to model year 2000 and newer OBD2-compliant vehicles.
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Additional Tests VIEWING VEHICLE INFORMATION 6. When you have finished viewing the retrieved vehicle ID information, press the LD/M button to exit. Viewing Available Modules The Scan Tool can retrieve a list of modules supported by the vehicle under test. 1.
Additional Tests ADJUSTMENTS AND SETTINGS 1. While linked to the vehicle, press and release the LD/M button. “Mode Selection Menu” displays. 2. Use the UP and DOWN buttons, as necessary, to highlight Vehicle Info, then press the LD/M button. The Vehicle Info Menu displays. 3.
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Additional Tests ADJUSTMENTS AND SETTINGS Firmware Version: Displays the Scan Tool’s firmware version. Select Language: Sets the display language for the Scan Tool to English, French or Spanish. Unit of Measurement: Sets the Unit of Measurement for the Scan Tool’s display to USA or metric. Adjustments and settings can be made only when the Scan Tool is NOT connected to a vehicle.
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Additional Tests ADJUSTMENTS AND SETTINGS Enabling the Audible Tone 1. Use the UP and DOWN buttons, as necessary, to highlight Audible Tone in the Menu, then press the ENTER button. The Audible Tone screen displays. 2. Press the UP or DOWN button, as necessary, to highlight ON or OFF as desired.
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Additional Tests ADJUSTMENTS AND SETTINGS The selected character displays “solid”, and the next character is highlighted. 3. Select the remaining characters in the DTC in the same way, pressing the DTC/FF button to confirm each character. When you have selected all the DTC characters, press the ENTER button to view the DTC definition.
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Additional Tests ADJUSTMENTS AND SETTINGS The Firmware Version screen displays. The screen shows the Scan Tool’s current firmware version. 2. Press the ENTER button to return to the Menu. Selecting the Display Language 1. Use the UP and DOWN buttons, necessary, highlight Select...
Generic (Global) OBD2 PID List The following is a list of Generic (Global) PIDs and their descriptions. Tool Display Unit Value PID Description ACC Pedal D XXX.X Accelerator Pedal Position D ACC Pedal E XXX.X Accelerator Pedal Position E ACC Pedal F XXX.X Accelerator Pedal Position F Air Status...
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Generic (Global) OBD2 PID List Tool Display Unit Value PID Description Ratio EQ Ratio 21 X.XXX Bank 2 - Sensor 1 Equivalence Ratio EQ Ratio 22 X.XXX Bank 2 - Sensor 2 Equivalence Ratio EQ Ratio 23 X.XXX Bank 2 - Sensor 3 Equivalence Ratio EQ Ratio 24 X.XXX...
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Generic (Global) OBD2 PID List Tool Display Unit Value PID Description O2S B1 S1 V X.XXX Bank 1 - Sensor 1 O2S Voltage O2S B1 S2 X.XXX Bank 1 - Sensor 2 O2S B1 S2 X.XXX Bank 1 - Sensor 2 O2S Current O2S B1 S2 V X.XXX Bank 1 - Sensor 2 O2S Voltage...
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Generic (Global) OBD2 PID List Tool Display Unit Value PID Description OBD Support OBD2 OBD Requirements OBD Support OBD Requirements OBD Support OBD and OBD Requirements OBD2 OBD Support OBD1 OBD Requirements OBD Support No OBD OBD Requirements OBD Support EOBD OBD Requirements OBD Support...
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Generic (Global) OBD2 PID List Tool Display Unit Value PID Description Veh Speed km/h XXX / XXX Vehicle Speed Sensor Warm-up DTC # Warm-ups since DTC Cleared OBD2...
Glossary GLOSSARY OF TERMS AND ABBREVIATIONS GLOSSARY OF TERMS AND ABBREVIATIONS CARB – California Air Resources Board CCM – Central Control Module Computer Control System – An electronic control system, consisting of an on-board computer and related sensors, switches and actuators, used to ensure peak performance and fuel efficiency while reducing pollutants in the vehicle’s emissions.
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Glossary GLOSSARY OF TERMS AND ABBREVIATIONS OBD2 – On-Board Diagnostics Version 2 (also referred to as “OBD II”) On-Board Computer – The central processing unit in the vehicle’s computer control system. PCM – Powertrain Control Module Pending Code – A code recorded on the “first trip” for a “two-trip” code. If the fault that caused the code to be set is not detected on the second trip, the code is automatically erased.
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