OBD II Emissions Testing
|
|
- Buck Porter
- 5 years ago
- Views:
Transcription
1 Automotive Repair Library, Auto Parts, Accessories, Tools & Equipment, Manuals & Books, Car BLOG, Links, Index OBD II Emissions Testing.. Copyright AA1Car.com Adapted from an article written by Larry Carley for Underhood Service magazine Are tailpipe emissions tests going away? That seems to be the case for 1996 and newer vehicles. A growing number of states have already changed or are in the process of changing their vehicle inspection programs to include Onboard Diagnostic II (OBD II) computer checks for late-model cars and trucks. In most instances, the OBD II check replaces the need for an I/M 240 or other loaded-mode tailpipe test as long as the vehicle passes. If it fails the OBD II test, some states give the vehicle owner the option of taking a "second-chance" tailpipe test. Older vehicles that do not have OBD II still have to take a tailpipe test. So far, 21 states and the District of Columbia have made the switch to OBD II testing. These include Alaska, Arizona, California (in areas that require "enhanced" emissions testing), Colorado, Connecticut, Georgia, Illinois, Indiana, Kentucky, Maine, Massachusetts, Missouri (St. Louis), Nevada, New Hampshire, North Carolina, Oregon, Texas (Houston and Dallas/Ft. Worth), Utah (Salt Lake City), Vermont, Washington and Wisconsin. Four additional states - New Jersey, New York, Pennsylvania (Pittsburgh and Philadelphia) and Virginia - have also added OBD II testing. In some states, the OBD II testing program is being gradually phased in. In Illinois, for example, owners of 1996 and newer vehicles that fail the OBD II test can take a second-chance tailpipe test. If they pass the tailpipe test, they are considered to be in compliance with the law - even if the Malfunction Indicator Lamp (MIL) is on. But starting in January 2004, the second-chance tailpipe test will be eliminated and all 1996 and newer vehicles must pass the OBD II test. What Is It? An OBD II test is a simple plug-in computer check that verifies four things: 1. The Vehicle Identification Number (VIN). 1 of 5 03/02/ :40 PM
2 2. That the vehicle s OBD II system is ready (all required readiness monitors have been set). 3. The status of the MIL lamp. The lamp must be functioning correctly and come on when commanded to do so. Otherwise, it must be off, indicating no codes. 4. That the vehicle has no diagnostic trouble codes that would cause the MIL lamp to come on. OBD II is primarily emissions-driven and will set codes anytime a vehicle has a fault that may cause emissions to exceed federal limits by 1.5 times. It doesn t necessarily mean the vehicle has a real emissions problem. Many times it does not. But if the nature of the failure is such that it might cause emissions to rise, OBD II will set a code anyway. That is why some states are allowing motorists to opt for a second-chance tailpipe test if their vehicle fails an OBD II test. In many instances, the vehicle will pass the tailpipe test. OBD II monitors misfires, converter efficiency, catalyst heater (if used), the evaporative system, air injection system (if used), fuel trim, oxygen sensors, exhaust gas recirculation (if used), secondary air system (if used), the coolant thermostat (starting in 2000), positive crankcase ventilation system (starting in 2002) and even the A/C systems on some 2002 and newer vehicles. If a situation develops in any of these monitored systems that could cause a real or potential emissions problem, OBD II will watch it, set a code and eventually illuminate the MIL. Some codes take time to mature and will not turn on the MIL lamp immediately. OBD II may wait until it detects the same problem on two separate drive cycles before it converts a pending code into a mature code and turns on the MIL. Plug-In Diagnostics All OBD II-equipped vehicles have a common J pin diagnostic connector and use the same "generic" fault codes. This means all you need is an OBD II-compliant code reader or scan tool to check readiness status, and to read and clear codes. The state emissions programs require vehicle inspection facilities to use a more sophisticated plug-in tool that also records vehicle data for record-keeping purposes, but otherwise they are using the same basic scan tool technology as everybody else. To access the OBD II system all you have to do is plug a code reader or scan tool into the 16-pin connector (Note: there are no "manual flash codes" on OBD II systems). The connector is usually located under the dash near the steering column. But on some vehicles, it can be hard to find. On many Hondas, the plug is located behind the ashtray. On BMW and VW vehicles, it is behind trim panels. On Volvos, the plug is next to the hand brake. On Audis, you will find it hidden behind the rear seat ashtray. OBD II Emissions Testing: Is Your Car Ready? One of the EPA requirements for using a plug-in OBD II check in lieu of a tailpipe test is to make sure the OBD II system is ready and has run its system monitors. Some vehicles (mostly some import models) have readiness issues when it comes to setting all the OBD II monitors. Consequently, the EPA currently allows up to two readiness flags not to be set prior to testing 1996 to 2000 model year vehicles. For 2001 and newer vehicles, only one readiness flag not set is allowed. Eventually, all readiness flags will have to be set to pass the test. When OBD II runs a self-check on a particular component or system, it lets you know by setting readiness flags, which are displayed on your code reader or scan tool. If OBD II has run all the available monitors and finds no faults, the MIL remains out and the vehicle passes the emissions test. But if all the required monitors have not run, the vehicle can t be given an OBD II test. The motorist must drive the vehicle and come back again, or take a tailpipe test if that is an option. If OBD II detects a fault when running a monitor, the setting of a code may prevent the remaining monitors from running. A bad oxygen sensor, for example, will prevent the catalyst monitor from running. Known OBD II Readiness Issues Getting all the monitors to run can be tricky on some vehicles. Each monitor has certain operating requirements that must take place before the self-check will run. To set the converter monitor, for example, the vehicle may have to be driven a certain distance at a variety of different speeds. The requirements for the various monitors can vary considerably from one vehicle manufacturer to another, so there is no "universal" drive cycle that will guarantee all the monitors will be set and ready. 2 of 5 03/02/ :40 PM
3 Mike Cole of the National Center for Vehicle Emissions Control and Safety (NCVECS) at Colorado State University says some vehicles require very specific drive cycles (called "drive traces" if you perform them on a road simulator or dyno) to activate certain self-checks like the catalyst and EVAP monitors. NCVECS has compiled all the known drive traces for various vehicles on a CD and offers the package to technicians for $ For more information, you can visit their website at As a general rule, doing some stop-and-go driving around town at speeds up to about 30 mph followed by five to seven minutes of steady 55 mph highway speed driving will usually set most or all of the monitors. Consequently, if you re checking an OBD II system and discover that one or more of the monitors have not run, it may be necessary to test drive the vehicle to set the remaining monitors. Some vehicles with known readiness issues include Mitsubishis (which require a very specific drive cycle), and 1996 Subarus and Volvo 850 Turbos (turning the key off clears all the readiness flags, so don t turn the vehicle off after driving). On 1997 Toyota Tercel and Paseo, the readiness flag for the EVAP monitor never will set, and no dealer fix is yet available. Other vehicles that often have a "not ready" condition for the EVAP and catalytic converter monitors include Volvos, Saab and Nissan 2.0L 200SX. OBD II Drive Cycles If the MIL comes on while driving, or remains on after starting the engine, it means OBD II has detected a problem. The lamp will usually remain on - unless the fault does not reoccur in three consecutive drive cycles that encounter the same operating conditions, or the fault is not detected for another 40 drive cycles. If OBD II sees no further evidence of the problem, it will turn off the MIL and erase the code. An OBD II drive cycle is not just turning the ignition key on and off or starting the engine. A drive cycle requires starting a cold engine and driving the vehicle until the engine reaches normal operating temperature. The next drive cycle doesn t begin until the engine has been shut off, allowed to cool back down and is restarted again. On some vehicles, the drive cycle also includes the cold soak time between trips. On some vehicles, the EVAP monitor won t run unless the vehicle has not been run for eight hours. There is no way to bypass or get around such requirements, so you have to do whatever the system requires. And if that means waiting, you have to wait. Reading OBD II Codes If OBD II has detected a fault, you should find one or more "generic" codes (which start with the prefix "P0"), and maybe one or more "enhanced" codes (OEM-specific codes that start with a "P1"). All OBD II compliant code readers and scan tools should be able to display generic codes, but some do not display all the OEM enhanced codes. As a result, you may not get the full picture of what is going on if you are using a scan tool with limited capabilities. The same goes for accessing many OBD II diagnostic features such as history codes, snapshot data and special diagnostic test modes that require two-way communication and special scan tool software. For example, some of the OBD II diagnostic features that are currently accessible with an OEM factory scan tool are not yet available on aftermarket scan tools. This may limit your ability to diagnose and repair certain types of problems. An inexpensive Palm Pilot or other Personal Digital Assistant (PDA) with scanner software and cable, or even a DIY type of code reader can be used to read and clear most OBD II codes on 1996 and newer vehicles. This type of tool often can be used to make a quick diagnosis, and in many cases you don t need anything else. But for advanced diagnostics, you need a professional grade scan tool or software package with advanced capabilities. For some jobs, you also may need a tool that can graph or display waveforms. That means buying a digital storage oscilloscope if you don t buy a high-end scanner that can do both. Most scan tools display data stream values, which is what the PCM tells it to display. If the PCM is misreading a sensor input or is substituting bogus information, you have no way of knowing without actually testing the circuit or component in question. That s where a scope comes in handy. When a scope is hooked up to a sensor or circuit, it shows what s actually going on inside that device or circuit. Voltage is displayed as a time-based waveform. Once you know how to read waveforms, you can tell good ones from bad ones. You can also compare waveforms against scan tool data to see if the numbers agree (which is a great way to identify internal PCM faults). A scope also allows you to perform and verify "action-reaction" tests. You can use one channel to monitor the action or input, and a second, third or fourth channel to watch the results. For example, you might want to watch the throttle position sensor, fuel injector waveform, crank sensor signal and ignition pattern when blipping the throttle to catch an intermittent misfire condition. Pattern Failures On some vehicles, OBD II may flag a fault when in fact there is no real emissions problem. These are called "pattern failures" and occur on a variety of different applications. Many of these can be found in 3 of 5 03/02/ :40 PM
4 factory technical service bulletins. One such pattern failure is a code P1406 on GM cars. This code indicates a fault with the EGR valve. Replacing the EGR valve may not solve the problem because the MIL comes back on and sets the same code. The real problem here is that the OBD II system isn t allowing enough time for the EGR valve to respond when it is commanded to open. The fix is to reprogram the computer so OBD II will allow more time for the appropriate response from the EGR valve. Misfires If an emissions problem is being caused by engine misfire, the OBD II lamp may flash as the misfire is occurring. But the lamp will not come on the first time a misfire problem is detected. It will only come on if the misfire continues during a second drive cycle and set a P0300 series code. A P0300 code would indicate a random misfire (probably due to a vacuum leak, open EGR valve, etc.). If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, OBD II won t tell you why the cylinder is misfiring. That you have to determine by doing more diagnostic tests once you ve isolated the misfire to a particular cylinder. The cause could be a fouled spark plug, bad spark plug wire, weak ignition coil, dirty or dead fuel injector, or a burned exhaust valve. Random misfires that jump around from cylinder to cylinder also will set a misfire code (P0300). The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open. Converter Codes OBD II monitors the operation of the catalytic converter with a second "downstream" oxygen sensor in the tailpipe behind the converter. It compares the upstream and downstream O2 sensor readings to estimate how efficiently the converter is working. A good converter should show little downstream O2 sensor activity with few cross-counts. If you look at the two O2 sensor readings on an oscilloscope, the upstream O2 sensor should be flipping back and forth from rich to lean (high voltage to low voltage) while the downstream O2 sensor should be flat-lined. If converter efficiency has dropped off due to old age or contamination, the downstream O2 sensor reading will look like the upstream reading. EVAP Codes OBD II monitors evaporative emissions by checking for fuel vapor leaks once a drive cycle. OBD II does this by applying vacuum or pressure to the fuel tank, vapor lines and charcoal canister. If it detects no airflow when the EVAP canister purge valve is opened, or it detects a leakage rate that is greater than that which would pass through a hole 0.040" in diameter (0.020" for 2000 and up model year vehicles), it indicates a fault. If you find a P0440 code that indicates a fuel vapor leak, finding the leak can be a challenge. The first place to start is the gas cap. A loose-fitting or damaged cap can allow enough air leakage to set a code. To find a leak in a vapor hose, you may need a leak detector that uses smoke and/or dye. A 0.020" hole is the size of a pin. Did You Find This Article Helpful? If so, a small donation (even $1) would help underwrite the cost of maintaining this website, and allow us to provide even more free automotive content. To make a donation, use the button below and fill in an amount. Thanks! 4 of 5 03/02/ :40 PM
5 More Emissions Articles: Understanding OBD II Driveability & Emissions Problems Fixing Emission Failures Most Common Trouble Codes (and what causes them) All About Onboard Diagnostics II (OBD II) Scantool Help (How to Use a Scantool to Diagnose Emission Problems) Basic Emission Control Systems Overview Exhaust Emissions Diagnosis Troubleshooting a P0420 Catalyst Code Catalytic Converters Exhaust Gas Recirculation (EGR) Driveability Diagnosis: Misfires Understanding Oxygen (O2) Sensors Wide Ratio Air Fuel (WRAF) Sensors Sensing Emission Problems (O2 Sensors) Emissions testing update Evolution of I/M 240 Obama's First Mistake: Allowing Individual States to Set Their Own Emission Rules for Cars Click Here for More Automotive Technical Articles Got an Emissions Problem or Question? Need Help Now? Use the Box Below to Describe Your Emissions Problem or Question: Click Here To Submit Your Emissions Problem or Question to our Automotive Experts Need More Information On Vehicle Emissions Testing or Emission Control Parts? Try Google Search. Enter Keywords or a Phrase: Search Be sure to visit our other websites: AA1Car Automotive Diagnostic Help Center Carley Automotive Software OBD2HELP Random-Misfire Scan Tool Help TROUBLE-CODES 5 of 5 03/02/ :40 PM
INDEX. 1.Safety Precautions and Warnings...3
INDEX 1.Safety Precautions and Warnings...3 2. General Information...5 2.1 On-Board Diagnostics (OBD) II... 5 2.2 Diagnostic Trouble Codes (DTCs)... 6 2.3 Location of the Data Link Connector (DLC)...7
More informationFor. Code Reader. User Manual
For OBD2 Code Reader User Manual http://www.motodok.com Table of Contents 1. Description... 2 2. Features... 2 3. Getting Started... 3 1. Connect Code Reader to Vehicle's Test Connector... 3 2. Read Diagnostic
More informationTable of Contents 1. INTRODUCTION GENERAL INFORMATION-ABOUT OBDII/EOBD PRODUCT DESCRIPTIONS OPERATIONS...11
Table of Contents 1. INTRODUCTION...1 2. GENERAL INFORMATION-ABOUT OBDII/EOBD...1 2.1 ON-BOARD DIAGNOSTICS (OBD) II...1 2.2 DIAGNOSTIC TROUBLE CODES (DTCS)...2 2.3 LOCATION OF THE DATA LINK CONNECTOR (DLC)...3
More informationHappy Birthday OBD II Emission Control System becomes diagnostic tool
FEATURE ARTICLE Happy Birthday OBD II Emission Control System becomes diagnostic tool 4 Bring out the birthday cake and light the candles, the second generation of onboard diagnostics, universally known
More informationVerified Fix #1 Tool Data Diagnostic Trouble Code Information Report Customer #1 VIN: JT8BL69SX4G015327 Customer Name: Year: 2004 Customer Phone#: 123-123-1234 Make: Lexus Report#: 162 Model: GS 430 Date
More informationEmissions Theory and Diagnostics
SECTION 1 Introduction 5-Gas Theory Emissions History OBD II SECTION 2 PCV System Function Failure Diagnosis Emissions Theory and Diagnostics SECTION 3 EGR EGR Theory Vacuum Systems Backpressure Systems
More informationPowertrain DTC Summaries OBD II
Powertrain DTC Summaries Quick Reference Diagnostic Guide Jaguar X-TYPE 2.5L and 3.0L 2002 Model Year Revised January, 2002: P0706, P0731, P0732, P0733, P0734, P0735, P0740, P1780 POSSIBLE CAUSES Revised
More information(P0135/P0155), (P0141/P0161), (P1131/P1151), (P1132/P1152). To further clarify this, see the more detailed scenario as follows:
1. Always reset KAM after performing a repair: After performing a repair on a vehicle with the MIL on, and/or DTCs present, always clear KAM. When a malfunction is present, the PCM adapts (attempts to
More informationPowertrain DTC Summaries EOBD
Powertrain DTC Summaries Quick Reference Diagnostic Guide Jaguar S-TYPE V6, V8 N/A and V8 SC 2002.5 Model Year Refer to pages 2 9 for important information regarding the use of Powertrain DTC Summaries.
More informationCatalytic Failures. Engine running too hot.
Catalytic Failures It is not uncommon for technicians to misdiagnose a driveability or emissions issue by blaming the converter. In many cases, it s not the converter s fault, but rather one of the engine
More informationDTC P0171, P0172, P0174, or P0175
Page 1 of 6 2009 Pontiac G8 G8 Service Manual Document ID: 2076050 DTC P0171, P0172, P0174, or P0175 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic
More informationVAPOR TRAILS: FINDING & FIXING EVAPORATIVE SYSTEM FAULTS. by 1975 and established the U.S. Environmental
VAPOR TRAILS: FINDING & FIXING EVAPORATIVE SYSTEM FAULTS BY BOB PATTENGALE Current OBD II systems can detect evap system leaks too small to see, or even smell. Finding and fixing these and other system
More informationDTC P0172 Fuel Trim System Rich
Page 1 of 6 1997 Chevrolet Cavalier Cavalier, Sunfire (VIN J) Service Manual Document ID: 47788 DTC P0172 Fuel Trim System Rich System Description A Closed Loop air/fuel metering system is used to provide
More informationYOU CAN DO IT!... 1 SAFETY PRECAUTIONS SAFETY FIRST!... 2
Table of Contents YOU CAN DO IT!... 1 SAFETY PRECAUTIONS SAFETY FIRST!... 2 ABOUT THE CODE READER VEHICLES COVERED... 3 CONTROLS AND INDICATORS... 4 DISPLAY FUNCTIONS... 5 ONBOARD DIAGNOSTICS COMPUTER
More informationinsider info. before it can be inspected for proper emissions. Misfire, Fuel System and Component
insider info. Rough Idle On MPFI Vehicles If you encounter a rough idle complaint on any sequential injection MPFI vehicle, basic checks should be made to ensure that the correct injector wire connector
More informationChapter. On-Board Diagnostics and Scan Tools
Chapter 24 On-Board Diagnostics and Scan Tools Objectives After studying this chapter, you will be able to: Discuss the purpose and operation of onboard diagnostic systems. Explain the use of scan tools
More informationUser s Manual XOB15091 OBD II / EOBD CODE READER. All Rights Reserved. Warranty and Service
5. Warranty and Service 5.1 Limited One Year Warranty The manufacturer/supplier warranty provided to customers for this product will be free from all defects in materials and workmanship for a period of
More informationFederal and California Emissions Warranties Parts List
Emissions warranties are state specific. Refer to the years/miles 1 columns below as follows: A Minimum coverage for all vehicles in all states. B Vehicles registered and normally operated in California,
More informationDTC P0174 Fuel Trim System Lean Bank 2
2000 Chevrolet/Geo S10 Pickup - 4WD DTC P0174 Fuel Trim System Lean Bank 2 Circuit Description In order to provide the best possible combination of driveability, fuel economy, and emission control, the
More informationOBDII INSPECTION GUIDE
OBDII INSPECTION GUIDE Texas Department of Public Safety September 2002 Prepared by: dkc de la Torre Klausmeier Consulting, Inc. ª2002 dkc Table of Contents GLOSSARY OF OBD TERMS...2 INTRODUCTION...12
More informationOBD II Data Interpretation
OBD II Data Interpretation What is OBDII? OBDII stands for on board diagnostics second generation superseding that of OBD1.OBDII is a system that was mandated by the Federal EPA and was developed by the
More informationPowertrain DTC Summaries EOBD
Powertrain DTC Summaries Quick Reference Diagnostic Guide Jaguar X-TYPE 2.0 L 2002.25 Model Year Refer to page 2 for important information regarding the use of Powertrain DTC Summaries. Jaguar X-TYPE 2.0
More informationYOU CAN DO IT!... 1 SAFETY PRECAUTIONS SAFETY FIRST!... 2
Table of Contents YOU CAN DO IT!... 1 SAFETY PRECAUTIONS SAFETY FIRST!... 2 ABOUT THE VEHICLES COVERED... 3 ADJUSTMENTS AND SETTINGS... 4 CONTROLS AND INDICATORS... 6 DISPLAY FUNCTIONS... 7 ONBOARD DIAGNOSTICS
More information01 02B ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (FS)]
ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (FS)] CONTROL SYSTEM WIRING DIAGRAM [FS]............................ 2 CONTROL SYSTEM DEVICE AND CONTROL RELATIONSHIP CHART [FS]........ 4 Engine Control System............
More informationYOU CAN DO IT!... 1 SAFETY PRECAUTIONS SAFETY FIRST!... 2
Table of Contents YOU CAN DO IT!... 1 SAFETY PRECAUTIONS SAFETY FIRST!... 2 ABOUT THE SCAN TOOL VEHICLES COVERED... 3 CONTROLS AND INDICATORS... 4 DISPLAY FUNCTIONS... 5 DISPLAY AND SETTINGS... 6 ONBOARD
More informationINTRODUCTION WHAT IS OBD?... 1 YOU CAN DO IT!... 2 SAFETY PRECAUTIONS SAFETY FIRST!... 3
Table of Contents INTRODUCTION WHAT IS OBD?... 1 YOU CAN DO IT!... 2 SAFETY PRECAUTIONS SAFETY FIRST!... 3 ABOUT THE CODE READER VEHICLES COVERED... 4 CONTROLS AND INDICATORS... 5 DISPLAY FUNCTIONS...
More informationENGINE 01 02A 1. Toc of SCT ON-BOARD DIAGNOSTIC [ENGINE. Toc of SCT 01 02A ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (ZM)] 01 02A
ENGINE 01 SECTION Toc of SCT ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (ZM)]...01-02A ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (FS)]...01-02B ON-BOARD DIAGNOSTIC [CRUISE CONTROL SYSTEM].......01-02C
More informationPowertrain DTC Summaries EOBD
Powertrain DTC Summaries Quick Reference Diagnostic Guide Jaguar X-TYPE 2.5L and 3.0L 2001.5 Model Year Revised January, 2002: P0706, P0731, P0732, P0733, P0734, P0735, P0740, P1780 POSSIBLE CAUSES Revised
More informationAre you as confident and
64 March 2007 BY BOB PATTENGALE Although Mode $06 is still a work in progress, it can be used to baseline a failure prior to repairs, then verify the accuracy of the diagnosis after repairs are completed.
More informationDTC P0420 or P0430. Circuit Description. DTC Descriptors. Conditions for Running the DTC
Page 1 of 5 2005 Cadillac STS STS (VIN D) Service Manual Engine Engine Controls - 4.6L (LH2) Diagnostic Information and Procedures DTC P0420 or P0430 Circuit Description A three-way catalytic converter
More informationG - TESTS W/CODES Nissan 240SX * PLEASE READ THIS FIRST * INTRODUCTION SELF-DIAGNOSTIC SYSTEM DESCRIPTION HARD FAILURES INTERMITTENT FAILURES
G - TESTS W/CODES 1990 Nissan 240SX 1990 ENGINE PERFORMANCE Self-Diagnostics Nissan 240SX and Axxess * PLEASE READ THIS FIRST * NOTE: This article has been revised according to Technical Service Bulletin
More informationABOUT THE DIAGNOSTIC TOOL
Table of Contents INTRODUCTION WHAT IS OBD?... 1 YOU CAN DO IT!... 2 SAFETY PRECAUTIONS SAFETY FIRST!... 3 ABOUT THE DIAGNOSTIC TOOL VEHICLES COVERED... 5 BATTERY REPLACEMENT... 6 DIAGNOSTIC TOOL CONTROLS
More information2002 ENGINE PERFORMANCE. Self-Diagnostics - RAV4. Before performing testing procedures, check for any related Technical Service Bulletins (TSBs).
2002 ENGINE PERFORMANCE Self-Diagnostics - RAV4 INTRODUCTION NOTE: Before performing testing procedures, check for any related Technical Service Bulletins (TSBs). To properly diagnosis and repair this
More informationGROUP 13Ab. 13Ab-2 CONTENTS TROUBLESHOOTING STRATEGY.. DATA LIST REFERENCE TABLE... 13Ab-29 TROUBLE CODE DIAGNOSIS...
13Ab-1 GROUP 13Ab CONTENTS TROUBLESHOOTING STRATEGY.. 13Ab-2 DATA LIST REFERENCE TABLE... 13Ab-29 TROUBLE CODE DIAGNOSIS..... 13Ab-2 FAIL-SAFE FUNCTION REFERENCE TABLE........................ 13Ab-20 DIAGNOSTIC
More informationINTRODUCTION WHAT IS OBD?... 1 YOU CAN DO IT!... 2 SAFETY PRECAUTIONS SAFETY FIRST!... 3
Table of Contents INTRODUCTION WHAT IS OBD?... 1 YOU CAN DO IT!... 2 SAFETY PRECAUTIONS SAFETY FIRST!... 3 ABOUT THE CODE READER VEHICLES COVERED... 5 BATTERY REPLACEMENT... 6 ADJUSTMENTS/SETTINGS AND
More informationAdaptive Fuel DTC Diagnostic Techniques
2007 PCED On Board Diagnostics SECTION 2: Diagnostic Methods Procedure revision date: 03/29/2006 Adaptive Fuel DTC Diagnostic Techniques The Adaptive Fuel Diagnostic Trouble Codes (DTC) Diagnostic Techniques
More informationNATEF ENGINE PERFORMANCE CHECKLIST Name Date Period
NATEF ENGINE PERFORMANCE CHECKLIST Name Period For every task in Engine Performance the following safety requirement must be strictly enforced: Comply with personal and environmental safety practices associated
More informationG - TESTS W/CODES - 2.2L
G - TESTS W/CODES - 2.2L 1994 Toyota Celica 1994 ENGINE PERFORMANCE Toyota 2.2L Self-Diagnostics Celica INTRODUCTION If no faults were found while performing F - BASIC TESTING, proceed with self-diagnostics.
More informationMonitoring The Problem
Monitoring The Problem by Kerry Jonsson Every so often we run into the problem of not having a problem to solve. What do we do when we have a vehicle that is not setting codes, but it is also not running
More informationGAS P013C-O2 SENSOR 2/2 SLOW RESPONSE - RICH TO LEAN
2008 Jeep Truck Grand Cherokee 4WD V8-5.7L Vehicle > ALL Diagnostic Trouble Codes ( DTC ) > Testing and Inspection > P Code Charts > P013C GAS P013C-O2 SENSOR 2/2 SLOW RESPONSE - RICH TO LEAN https://my.alldata.com/repair/#/repair/article/44404/component/3926/itype/423/nonstandard/1175544
More informationTroubleCodes.net- engine & OBD2 Trouble Codes and Technical info & Tool Store.
Page 1 sur 8 advertisement Articles / SAFETY / TOOL STORE!! / BAT Support / Search / Help / Guestbook / About Us / Contact Us Forums Navigation Links & Technical Trouble Codes Sunday, January 23, 2005
More informationDTC P0420. Circuit Description. Conditions for Running the DTC.
Page 1 of 5 DTC P0420 2003 Buick LeSabre LeSabre (VIN H) Service Manual Document ID: 792202 Circuit Description In order to control emissions of hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen
More information1 of 7 12/18/2016 9:15 PM
1 of 7 12/18/2016 9:15 PM P0456-EVAP SYSTEM SMALL LEAK Special Tools: For a complete wiring diagram, refer to the Wiring Information. 2 of 7 12/18/2016 9:15 PM Theory of Operation 3 of 7 12/18/2016 9:15
More information1 of 8 9/11/2015 3:59 PM
1 of 8 9/11/2015 3:59 PM P013C-O2 SENSOR 2/2 SLOW RESPONSE - RICH TO LEAN For complete wiring diagrams refer to Diagrams/Electrical. - When Monitored: With the engine running, vehicle speed between 32
More informationINTRODUCTION. FOR ios DEVICES
Table of Contents INTRODUCTION ABOUT QUICKLINK... 1 Vehicles Covered... 1 The QUICKLINK Device... 2 The QUICKLINK App... 2 COMPUTER ENGINE CONTROLS... 2 The Introduction of Electronic Engine Controls...
More informationDTC P0341 Camshaft Position (CMP) Sensor Performance
Page 1 of 5 1999 Buick Century Century, Regal VIN W Service Manual Document ID: 345654 DTC P0341 Camshaft Position (CMP) Sensor Performance Circuit Description During cranking, the Ignition Control Module
More information1. OBD II Readiness Monitors An important part of a vehicle s OBD II system is the Readiness Monitors, which are indicators used to find out if all
1. OBD II Readiness Monitors An important part of a vehicle s OBD II system is the Readiness Monitors, which are indicators used to find out if all of the emissions components have been evaluated by the
More informationTable of Contents. CarScan+OBD1
Table of Contents INTRODUCTION WHAT IS OBD?... 1 YOU CAN DO IT!... 2 SAFETY PRECAUTIONS SAFETY FIRST!... 3 ABOUT THE SCAN TOOL VEHICLES COVERED... 5 BATTERY REPLACEMENT... 6 SCAN TOOL CONTROLS CONTROLS
More informationMissing Mini. There are two situations we dislike extremely. The. Quick Test
The Missing Mini No, this is not a mystery about a Mini that has gone missing. This car had been off the road for a year s storage in a body shop. When it came time to return the vehicle to the customer,
More informationModule 22 Ignition Systems - Outputs
Module 22 Ignition Systems - Outputs Author: Grant Swaim E-mail: sureseal@nr.infi.net URL: www.tech2tech.net Phone: (336) 632-9882 Fax: (336) 632-9688 Postal Address: Tech-2-Tech Website PO Box 18443 Greensboro,
More informationFixed Right First Time. Volvo Technicians, Service and Parts Managers
Tech-Net Notes Fixed Right First Time Volvo Technicians, Service and Parts Managers NO: 25-19 DATE: 6-30-2004 MODEL: 960-S/V90/850/S70/V70/C70 M. YEAR: 1996-1998 SUBJECT: Establishing Readiness for OBD
More informationSECONDARY PARAMETERS AND ENABLE CONDITIONS
SECONDARY S AND Manifold Pressure Sensor Rationality Manifold Pressure Too Low Manifold Pressure Too High Intake Air Temperature Sensor Shorted Intake Air Temperature Sensor Open Coolant Temperature Sensor
More informationcylinder cars / trucks (except Saturn S-series cars) ENGINE DIAGNOSTIC PARAMETERS
2001 4-cylinder cars / trucks (except Saturn S-series cars) ENGINE DIAGNOSTIC S SECONDARY S AND Manifold Pressure/Throttle Position Sensor Manifold Pressure/Throttle Position Sensor Manifold Pressure Too
More informationLambda Control Fuel Adaptation and Fuel Trim
Lambda Control Fuel Adaptation and Fuel Trim Q: What is Lambda and Lambda Control? A: In the case of a gasoline engine, the optimal mixture of air to fuel for complete combustion is a ratio of 14.7 parts
More informationINTRODUCTION WHAT IS OBD?... 1 YOU CAN DO IT!... 2
Table of Contents INTRODUCTION WHAT IS OBD?... 1 YOU CAN DO IT!... 2 ABOUT THE SCAN TOOL SAFETY FIRST!... 3 VEHICLES COVERED... 4 CONTROLS AND INDICATORS... 5 DISPLAY FUNCTIONS... 6 INITIAL ADJUSTMENTS...
More informationTable of Contents. 3120f
Table of Contents INTRODUCTION WHAT IS OBD?... 1 YOU CAN DO IT!... 2 SAFETY PRECAUTIONS SAFETY FIRST!... 3 ABOUT THE DIAGNOSTIC TOOL VEHICLES COVERED... 5 BATTERY REPLACEMENT... 6 DIAGNOSTIC TOOL CONTROLS
More informationDIAGNOSTIC TROUBLE CODE CHART
DI158 DIAGNOSTIC TROUBLE CODE CHART HINT: ENGINE (2JZGTE) Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument or other factors. If a malfunction code
More informationPREPARATION FOR TESTING
Table of Contents INTRODUCTION WHAT IS OBD?... 1 YOU CAN DO IT!... 2 SAFETY PRECAUTIONS SAFETY FIRST!... 3 ABOUT THE FIXADVISOR VEHICLES COVERED... 5 BATTERY REPLACEMENT... 6 ADJUSTMENTS AND SETTINGS...
More informationFuel Metering System Component Description
1999 Chevrolet/Geo Tahoe - 4WD Fuel Metering System Component Description Purpose The function of the fuel metering system is to deliver the correct amount of fuel to the engine under all operating conditions.
More informationModule 12 Throttle Position (TP) Sensor
Module 12 Throttle Position (TP) Sensor Author: Grant Swaim E-mail: sureseal@nr.infi.net URL: www.tech2tech.net Phone: (336) 632-9882 Fax: (336) 632-9688 Postal Address: Tech-2-Tech Website PO Box 18443
More informationTechnical Service Bulletin
Number 02-36-030 Subject OBD-II READINESS TEST DRIVE CYCLE FOR 1996-1998 SONATA Date Model DECEMBER, 2002 1996-1998 SONATA DESCRIPTION: This TSB describes Drive Cycles which may assist the vehicle s OBD-II
More informationDTC Summaries. NipponDenso V12 Engine Management
DTC Summaries NipponDenso V12 Engine Management OBD II MONITORING CONDITIONS: When testing for DTC reoccurrence, it can be determined if the Service Drive Cycle was of sufficient length by performing a
More information2002 Buick Rendezvous - AWD
2002 Buick Rendezvous - AWD DTC P0410 Description The control module activates the secondary air injection (AIR) system by grounding both the pump relay and the vacuum control solenoid control circuits.
More informationOBD II DRIVE CYCLE DATE: May, 2003
Page 1 of 7 SUBJECT : OBD II DRIVE CYCLE DATE: May, 2003 No: MODEL: 1996 98 models CIRCULATE TO: [ ] GENERAL MANAGER [ ] PARTS MANAGER [X] TECHNICIAN [X] SERVICE ADVISOR [X] SERVICE MANAGER [X] WARRANTY
More informationTable of Contents. 5. Warranty and Service...29
Table of Contents 1. Safety Precautions and Warnings...2 2. General Information 2.1 On-Board-Diagnostics (OBD) II......3 2.2 Diagnostic Trouble Codes (DTCs) 3 2.3 Location of the Data Link Connector (DLC)
More informationCatalytic Converter Testing
Catalytic Converter Testing The first catalytic converter was created before the use of onboard computer systems its job was to oxidize HC and CO into CO2 and H2O. The term oxidizes means to add O2 to
More informationModule 11 Thermistor Inputs
Module 11 Thermistor Inputs Author: Grant Swaim E-mail: sureseal@nr.infi.net URL: www.tech2tech.net Phone: (336) 632-9882 Fax: (336) 632-9688 Postal Address: Tech-2-Tech Website PO Box 18443 Greensboro,
More informationDTC P0102 Mass Air Flow (MAF) Sensor Circuit Low Frequency
Page 1 of 5 1997 Pontiac Grand Prix Grand Prix (VIN W) Service Manual Engine Engine Controls - 3.8L Diagnostic Information and Procedures Document ID: 106986 DTC P0102 Mass Air Flow (MAF) Sensor Circuit
More informationChapter 20 OBD-II Diesel Monitors
Light Vehicle Diesel Engines First Edition Chapter 20 OBD-II Diesel Monitors LEARNING OBJECTIVES (1 of 2) 20.1 Prepare for the Light Vehicle Diesel Engine (A9) ASE certification fuel system diagnosis and
More informationDTC P1415 Secondary Air Injection (AIR) System Bank 1
Page 1 of 5 2000 GMC Truck GMC K Sierra - 4WD Sierra, Silverado, Suburban, Tahoe, Yukon (VIN C/K) Service Manual Document ID: 546887 DTC P1415 Secondary Air Injection (AIR) System Bank 1 Circuit Description
More information#97-T-20A: MIL (Service Engine Soon Telltale Lamp) On and EGR DTCs P0401, P0404, P0405, P1404 and/or P1406 in PCM Memory - (Jan 6, 2003)
#97-T-20A: MIL (Service Engine Soon Telltale Lamp) On and EGR DTCs P0401, P0404, P0405, P1404 and/or P1406 in PCM Memory - (Jan 6, 2003) Subject: Malfunction Indicator Lamp (SERVICE ENGINE SOON Telltale
More informationSTATE I/M PROGRAM ADVISORY BULLETIN
ATTENTION: GENERAL MANAGER q PARTS MANAGER q CLAIMS PERSONNEL q SERVICE MANAGER q IMPORTANT - All Service Personnel Should Read and Initial in the boxes provided, right. STATE I/M PROGRAM ADVISORY BULLETIN
More informationSelected excerpts from the book: Lab Scopes: Introductory & Advanced. Steven McAfee
Selected excerpts from the book: Lab Scopes: Introductory & Advanced Steven McAfee 1. 2. 3. 4. 5. 6. Excerpt from Chapter 1 Lab Scopes How do they work? (page 6) Excerpt from Chapter 3 Pattern Recognition
More informationARTICLE BEGINNING INTRODUCTION SELF-DIAGNOSTIC SYSTEM RETRIEVING DTCS ENGINE PERFORMANCE Volkswagen Self-Diagnostics - Gasoline
Article Text ARTICLE BEGINNING 1996 ENGINE PERFORMANCE Volkswagen Self-Diagnostics - Gasoline Cabrio, Golf III, GTI, Jetta III, Passat INTRODUCTION If no faults were found while performing preliminary
More informationDIAGNOSTIC TROUBLE CODE DEFINITIONS
DIAGNOSTIC TROUBLE CODE DEFINITIONS DIAGNOSTIC TROUBLE CODE DEFINITIONS DTC Description P0010 Variable Valve Timing Circuit Malfunction (Bank 1) P0020 Variable Valve Timing Circuit Malfunction (Bank 2)
More informationAuto Diagnosis Test #7 Review
Auto Diagnosis Test #7 Review Your own hand written notes may be used for the 1 st 10 minutes of the test Based on Chapters 25, 26, 32, 33, 34 and Lab Demonstrations Auto Diagnosis Test #7 Review Your
More informationDiagnostic Trouble Code (DTC) Guide for Omnitek ECM 64A/66A/88A
Diagnostic Trouble Code (DTC) Guide for Omnitek ECM 64A/66A/88A Omnitek Engineering Corp. 1333 Keystone Way, #101 Vista, CA 92081 Tel. 760-591-0089 - Fax. 760-591-0880 - Copyright 2006 Omnitek Engineering,
More informationOWNER S MANUAL. The Easiest And Best Way To Troubleshoot 1996 and Newer OBD II Vehicles!
OWNER S MANUAL The Easiest And Best Way To Troubleshoot 1996 and Newer OBD II Vehicles! E1 Table of Contents Paragraph Title Page No. YOU CAN DO IT!.............................. ii GENERAL INFORMATION
More informationATASA 5 th. Engine Performance Systems. Please Read The Summary. ATASA 5 TH Study Guide Chapter 25 Pages Engine Performance Systems 100 Points
ATASA 5 TH Study Guide Chapter 25 Pages 725 763 100 Points Please Read The Summary 1. Engine systems are those responsible for how an engine runs. Performance Emission Control Electronic 2. The correct
More informationService Bulletin. DTC Detection Item Associated Monitor
Service Bulletin 03-010 Applies To: All OBD II equipped models except SLX March 29, 2003 OBD II DTCs and Their Associated Monitors This is a list of all DTCs for all OBD II models. No one model has all
More information2.8 Liter VR6 2V Fuel Injection & Ignition, Engine Code(s): AAA m.y
2.8 Liter VR6 2V Fuel Injection & Ignition, Engine Code(s): AAA m.y. 1996-1997 01 - On Board Diagnostic (OBD) On Board Diagnostic (OBD II) Malfunction Indicator Lamp (MIL) On Board Diagnostic (OBD II),
More informationComputers and Control Systems: Monitors, Trips, Drive Cycles and Readiness Codes
1998 Volvo V70 AWD L5-2.4L Turbo VIN 56 B5254T Page 1 Computers and Control Systems: Monitors, Trips, Drive Cycles and Readiness Codes Generic Drive Cycle Readiness Code Resetting Procedure (Generic Drive
More informationSecondary Diagnosis. By Randy Bernklau
Secondary Diagnosis Most technicians have diagnosed secondary ignition systems using the large console-type analog scopes, but there are times when it just isn t practical to use an analyzer that is that
More informationYOU CAN DO IT! SAFETY PRECAUTIONS
Table of Contents INTRODUCTION WHAT IS OBD?... 1 YOU CAN DO IT!... 2 SAFETY PRECAUTIONS SAFETY FIRST!... 3 ABOUT THE FIXADVISOR PRO VEHICLES COVERED... 5 BATTERY REPLACEMENT... 6 ADJUSTMENTS AND SETTINGS...
More information2003 Audi A4 testing
2003 Audi A4 testing An Audi A4 equipped with a 1.8L AMB turbocharged engine was in for service. The owner had just received it back from his kid, indicating it was neglected, having few if any oil changes
More informationOBD-Codes.com Your OBD-II Trouble Codes Repair Site
Page 1 sur 11 OBD-Codes.com Your OBD-II Trouble Codes Repair Site URL of this page: Like 261 likes. Sign Up to see what your friends like. OBD-II (Check Engine Light) Trouble Codes Welcome to OBD-Codes.com,
More informationOn Board Diagnostics (OBD) Monitors
2007 PCED On Board Diagnostics SECTION 1: Description and Operation Procedure revision date: 03/29/2006 On Board Diagnostics (OBD) Monitors OBD-I, OBD-II and Engine Manufacturer Diagnostics (EMD) Overview
More informationDI 3 ENGINE DIAGNOSTICS DI PRE CHECK
FI0534 PRECHECK DI3 DI09603 1. DIAGNOSIS SYSTEM (a) Description When troubleshooting OBD II vehicles, the only difference from the usual troubleshooting procedure is that you connect to the vehicle the
More informationAlternative Fuel Engine Control Unit
1999 Chevrolet/Geo Cavalier (CNG) Alternative Fuel Engine Control Unit Table 1: AF ECU Function Parameters The (AF ECU) controls alternative fuel engine operation. The control unit monitors various engine
More informationUSER S MANUAL. Table of Contents
Table of Contents 1. Safety Precautions and Warnings... 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
More informationTHE witech SOFTWARE LEVEL MUST BE AT RELEASE **15.04** OR HIGHER TO PERFORM THIS PROCEDURE.
2014 RAM 3500 HD 6.7L Eng Big Horn FLASH: 6.7L DIAGNOSTIC AND SYSTEM IMPROVEMENTS TECHNICAL SERVICE BULLETIN Reference Number(s): 18-045-15, Date of Issue: May 20, 2015 CHRYSLER: 2014 Ram 2500 Pick Up
More informationPage 1 of 18 2004 PCED On Board Diagnostics SECTION 5: Pinpoint Tests Procedure revision date: 10/26/2007 H: Fuel Control H: Introduction H1 PERFORM THE KOER SELF-TEST Engine at normal operating temperature.
More informationFasDiag JD101 Code Reader. User Manual. OBDII Car Diagnostic Scanner
TM FasDiag JD101 Code Reader User Manual OBDII Car Diagnostic Scanner Introduction Thank you very much for choosing FasDiag JD101OBDII Car Diagnostic Scanner. Please read this manual before using the product
More informationManufactured Home Shipments by Product Mix ( )
Manufactured Home Shipments by Product Mix (1990-2014) Data Source: Institute for Building Technology and Safety (IBTS) * "Destination Pending" represents month-end finished home inventory at a plant.
More informationGROUP 13Ab. 13Ab-2 CONTENTS TROUBLESHOOTING STRATEGY.. DATA LIST REFERENCE TABLE... 13Ab-28 TROUBLE CODE DIAGNOSIS...
13Ab-1 GROUP 13Ab CONTENTS TROUBLESHOOTING STRATEGY.. 13Ab-2 DATA LIST REFERENCE TABLE... 13Ab-28 TROUBLE CODE DIAGNOSIS..... 13Ab-2 FAIL-SAFE/BACKUP FUNCTION TABLE........................ 13Ab-20 DIAGNOSTIC
More informationAlthough catalytic converters. Keeping the
Keeping the BY JEFF MASTERMAN The catalytic converter isn t only an exhaust and emissions component, it s now an intricate part of OBD II systems. Here s how to keep your customers cats purring along,
More informationDRIVE CYCLES > JTEC > OBD-II Monitor Enabling Criteria RWD/4WD JTEC PCM Equipped Vehicles >
Print 2002 Jeep Grand Cherokee 4.7L Eng Limited OBD-II DRIVE CYCLES DRIVE CYCLES > 1995-02 JTEC > OBD-II Monitor Enabling Criteria RWD/4WD JTEC PCM Equipped Vehicles > The following procedure has been
More informationI ve had lots of requests recently for
The right picture can be worth a thousand words. Here, circuit diagrams and oscilloscope patterns aid in visualizing the effects of resistance at two locations in a series circuit. Mark Warren smwarren@motor.com
More informationDIAGNOSTIC TROUBLE CODE CHART HINT:
DIAGNOSTICS DIAGNOSTIC TROUBLE CODE CHART HINT: SFI SYSTEM (1MZFE) 05241 Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument or other factors. If a
More informationH - TESTS W/O CODES Volvo 960 INTRODUCTION SYMPTOMS SYMPTOM DIAGNOSIS ENGINE PERFORMANCE Volvo Trouble Shooting - No Codes
H - TESTS W/O CODES 1994 Volvo 960 1994 ENGINE PERFORMANCE Volvo Trouble Shooting - No Codes Volvo; 850, 940, 960 INTRODUCTION Before diagnosing symptoms or intermittent faults, perform steps in appropriate
More information