NJ-CERT Module 5: OBD Repair: Common Failure Reasons,

Challenging Cases, and Repair Strategies

A course made for New Jersey’s Certified Emission Repair Technician (ERT)

Presented by the NJ Department of Environmental Protection (NJDEP) Bureau of Mobile Sources

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• Note: If you have not printed out the Master Acronym List, please do so now OR have it open while viewing these Modules.

• For detailed rules and regulations, please visit Section 2 on the NJ-CERT homepage.

Thank you

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Part 1- New Jersey’s OBD Inspection Test Components and Process

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NJ’s OBD Test – The Basics

• Official testing of OBD eligible vehicles began in January 2004• Allows the inspection workstation to read a vehicle’s OBD

computer• Determines if there have been any malfunctions in the vehicle’s

emissions-related systems• Ensures that the OBD system itself is functioning properly• Captures additional data used for vehicle identification and fraud

detection purposes

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OBD Testable VehiclesGasoline

• Model year 1996 and newer with a GVWR less than or equal to 8,500 pounds

• Model year 2008 and newer with a GVWR between 8,501 and 14,000 pounds

Diesel• Model year 1997 and newer with a GVWR less than or equal to 8,500

poundsOther Fuel Types

Compressed Natural Gas (CNG), Liquefied Natural Gas (LNG), and hybrids follow the GVWR and model year cutoffs of their gasoline counterparts for the purposes of determining OBD applicability

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OBD Test Components

1. Visual MIL Bulb Check2. Visual MIL KOER Check3. DLC Condition Check4. Communications Check5. Readiness Status Check6. MIL Command Status7. DTC Check for those vehicles with the MIL commanded on

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OBD Test Sequence - Steps 1 & 2

1. Visual MIL Bulb Check - Performed by briefly turning the motor vehicle ignition system to the KOEO position and visually verifying that the MIL illuminates. If it does not illuminate, the vehicle has failed.

2. Visual MIL KOER Check - Performed by starting the vehicle, and visually determining if the MIL is on or off. If the MIL illuminates or flashes continuously while the engine is running, it is considered on. If the MIL is on, the vehicle has failed.

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OBD Test Sequence – Step 3

3. DLC Condition Check - If the DLC is damaged, missing, or obstructed, the motor vehicle has failed and the OBD test will end. If the DLC is present and accessible, the inspection workstation is connected to the DLC with the motor vehicle’s engine turned off.

For the remainder of the OBD test, the motor vehicle is then started and left running (KOER) to allow the inspection workstation to attempt to communicate with the motor vehicle’s OBD system.

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OBD Test Sequence – Step 4

4. Communications Check - If the inspection workstation successfully communicates with the motor vehicle OBD system, it will then retrieve all of the required data from the OBD system. If the inspection workstation cannot successfully communicate with the motor vehicle’s OBD system after 4 attempts, the motor vehicle has failed the OBD test.

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OBD Test Sequence – Step 5

5. Readiness Status Check - If the inspection workstation determines that the vehicle’s OBD system does not indicate that the required number of supported readiness monitors have been set, the motor vehicle is deemed “not ready” for an OBD inspection and has failed the OBD inspection. The details for the number of required readiness monitors for each vehicle type is discussed in detail in the readiness criteria section of this module.

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OBD Test Sequence – Step 6

6. MIL Command Status Check - The inspection workstation will determine the vehicle’s MIL command status and if any malfunctions, i.e. DTCs, have been recorded by the vehicle’s OBD system. If the vehicle’s MIL is commanded on, the motor vehicle has failed the OBD test.

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OBD Test Sequence – Step 7

7. DTC Check - When the OBD system detects that an emissions-related component or system is not operating normally within acceptable limits the MIL is commanded on and one or more DTCs that correspond to the fault detected are stored. Up to 10 individual DTCs will be recorded in the inspection record and on the VIR. Reviewing these codes is often the first step in diagnosing an emissions-related problem.

If a vehicle’s MIL is commanded off, the motor vehicle does not fail the OBD test, and no DTCs are recorded in the inspection record.

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What is a Passing OBD Inspection?

To recap, if the vehicle….

passes its visual MIL inspections (Test Sequences 1 and 2), the DLC is in good condition and successfully communicates with the

inspection workstation (Test Sequences 3 and 4), the inspection workstation indicates that the motor vehicle is deemed “ready”

(Test Sequence 5), and… the OBD system is not indicating any malfunctions, i.e. MIL is commanded off

(Test Sequences 6 and 7),

…then the motor vehicle passes the OBD test.

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Part 2-OBD Repair: Common Failure Reasons

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Why Did the Vehicle Fail? –Understanding the Vehicle Inspection Report (VIR)

• When a vehicle fails the OBD inspection in New Jersey, the motorist is provided with a VIR that contains important information on why the vehicle failed and what the next steps are to prepare the vehicle for reinspection.

• An ERT should use this information to begin diagnosing the vehicle’s emission-related problem(s), paying particular attention to the explanation section, as any specific reinspection requirements will be listed there.

• The motorist is also provided with an Emissions Repair Form, which an ERF must fill out, stamp, and sign after repairs are completed.

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Locating and Reprinting a VIR

• In many cases, the motorist will bring the VIR with them to provide to the ERF.

• If the motorist doesn’t have the VIR, a duplicate VIR can be accessed by entering the vehicle’s VIN at the following website: http://pweb.nj-cleanair.com/VIRPrint

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Sample VIRs

Some sample VIRs are included as supplemental materials for this module. Please click on the links below to directly access each sample:

• Sample VIR – Failing, MIL On with P0420 DTC• Sample VIR – Passing, In-State Inspection• Sample VIR – Passing, Out-of-State Inspection

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Reinspection Timing

• If a vehicle fails inspection, the motorist has until the last day of the month following the month indicated on the inspection sticker to make repairs and return for reinspection.

• Vehicles overdue for inspection do not receive additional time to make necessary repairs.

• Vehicles that have previously failed inspection do not receive additional time to make necessary repairs from additional reinspections.

• A vehicle outside of the noted allowable repair window may be cited at any time by law enforcement for an expired sticker, equipment out of compliance, or failure to make repairs.

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Communication Failures - Potential Causes

There are many reasons why a vehicle might not communicate with the inspection workstation, including but not limited to the following:

• The DLC is damaged; i.e. warped, have loose pins, have a blown fuse, bad ground, or be corroded or contain debris.

• The vehicle has an improperly installed aftermarket component, such as a remote starter, security/alarm system, satellite radio or CD player, or navigation system.

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Communications Failures Generic Scan Tool vs Official Inspection Workstation

• During diagnostics, you may find that a vehicle that failed inspection for communications is able to communicate on your generic or handheld OBD scan tool. This is not an acceptable substitute for an official OBD test on a state-approved inspection workstation.

• Generic scan tools do not match the specifications and operating characteristics of New Jersey’s official OBD emissions testing equipment.

• A lookup table (NJDEP OBD Exclusion Table) on the inspection workstation is used to exclude vehicles with known communications problems from the OBD test. In such cases, the MIL itself, rather than the MIL command status, is used to determine pass/fail status. Currently, only one vehicle is excluded from OBD communications which is a 2009 SAAB 9-5.

• Most communications failures will require diagnostics and repairs to be brought into compliance to pass inspection.

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Communication Failures –Troubleshooting Tips

• Always check for vehicle recalls and Technical Service Bulletins (TSBs) when diagnosing communications failures.

• Ensure that you are using the OBDII global/generic protocol option of your scan tool. If your scan tool requests any part of the VIN to identify the vehicle, you are probably using the factory “enhanced” side, which may not be comparable to the protocol used by the inspection workstation.

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Communication Failures – DLC Pin Checks

Things to check• Voltage drop on ground pins 4 & 5 should be 0.2

volts or less• On CAN vehicles resistance between pin 6 & 14

should be approximately 60 ohms• On CAN vehicles a lab scope can be used to

measure the signal voltage of both the high and low communication lines. CAN high should have a range of 2.5 to 3.5 volts while CAN low should have a range of 2.5 to 1.5 volts

• For Non-CAN vehicles the communication lines can be scoped to look for reasonable voltage ranges

Pin 2 - J1850 Bus+ (PWM / VPW)Pin 4 - Chassis GroundPin 5 - Signal GroundPin 6 - CAN HighPin 7 - ISO 9141-2 K Line (ISO / KWP)Pin 10 - J1850 Bus- (PWM only)Pin 14 - CAN LowPin 15 - ISO 9141-2 L Line (ISO / KWP)Pin 16 - Battery Power

Pin assignments

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MIL On and DTCs Present

• A vehicle with the MIL on or commanded on requires diagnostics and repairs to be brought into compliance to pass inspection.

• One or more DTCs may be present in these cases. Reviewing these codes, along with other information in the OBD system, can help guide a proper diagnosis.

• If the MIL light does not turn on when commanded on, or if the MIL light is on but no DTCs are present, these are also problems that must be diagnosed and repaired for the vehicle to pass inspection.

• A vehicle may pass inspection with DTCs pending or in memory if the MIL has not been commanded on.

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Readiness Monitors - Overview

• The OBD system monitors the status of up to eleven emission control related subsystems by performing either continuous or periodic functional tests of specific components and vehicle conditions.

• Readiness monitor values• Ready - the monitor has been evaluated, aka set or complete• Not ready - the monitor has not been evaluated, aka unset or incomplete • Not Supported - the motor vehicle is not equipped with the monitor in

question• When monitors are not ready, the corresponding emission-control

related subsystems in the vehicle are not being monitored; there is no way to know if the systems are operating properly until the monitors are set.

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Continuous Monitors

• There are three continuous readiness monitors:• comprehensive components (any monitored sensor that is not part

of another monitor), • fuel system, and • misfire.

• All three continuous monitors in gasoline vehicles must be supported and ready to pass the OBD test. For diesel and other fuel types, continuous monitors are not considered as part of the readiness status.

• A gasoline vehicle that is not excluded for continuous monitors and has one or more continuous monitors not supported or not ready will fail the readiness portion of the OBD test.

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Non-continuous Monitors• For gasoline vehicles, there are eight non-continuous readiness monitors:

• catalyst, • heated catalyst, • oxygen sensor, • heated oxygen sensor, • AC refrigerant, • exhaust gas recirculation, • secondary air, and • evaporative emissions system.

• A vehicle of model year 1996-2000 is permitted to have two non-continuous monitors not ready and still pass the readiness portion of the OBD test.

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Drive Cycle and Enabling Criteria

• The periodic, or non-continuous, monitors only run after a certain set of conditions has been met.

• The algorithms for running the readiness monitors are unique to each motor vehicle manufacturer and readiness monitor, and involve such preconditions as ambient temperature, engine coolant temperature, fuel level, and vehicle speed. This is referred to as the enabling criteria of each readiness monitor.

• These sets of conditions are typically referred to as the “drive cycle”. The correct drive cycle for a vehicle must be completed in order to set the monitors.

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Locating Drive Cycle Information

• Generic drive cycles can be found in vehicle owners manuals, in state inspection brochures or pamphlets, or through a simple Internet search. These drive cycles may work in some cases, but in others, they may not be detailed enough to set some or all of the monitors.

• Vehicle-specific drive cycles with detailed associated enabling criteria can be obtained through vehicle manufacturers, online subscription repair services, or aftermarket publications.

• Please be aware that in cases where a motorist has been unable to complete a drive cycle in the course of everyday driving, we advise the motorist to find an ERF to complete the drive cycle for them, as well as to provide any additional diagnostics/repairs that may be needed.

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Drive Cycle and Continuous Monitors

Continuous monitors are generally known to run upon vehicle start up. In the past (and still applicable to older model year vehicles) drive cycles were generally irrelevant to continuous monitors.Exceptions:• The comprehensive component monitor is subject to enabling criteria and

drive cycle completion in many cases and specific vehicle makes, models, and model years.

• A change to the fuel system monitor requirements for vehicles of model year 2011 and newer now has the monitor dependent on a drive cycle completion in most vehicles.

These continuous monitor scenarios and strategies are discussed in more detail in Part 3 later in this module.

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Readiness Exclusions• Some vehicles have known manufacturer-related issues that do not allow

the successful completion of some or all readiness monitors. A lookup table (NJDEP OBD Exclusion Table) is maintained on the inspection workstation that will automatically ignore the readiness status, or some portion of it, for these vehicles during an inspection.

• There are 84 individual year/make/model combinations completely excluded from readiness testing results. These are identified by a ‘Y’ in the column labeled ‘Readiness Exclusion’ in the table.

• There are an additional 85 individual year/make/model combinations that are excluded from the continuous monitor readiness portion. These are identified by a ‘Y’ in the column labeled ‘Continuous Monitor Exclusion’ in the table.

• It is recommended that you become familiar with the conditions of the exclusions in this table so you do not spend unnecessary time attempting to set all monitors for a reinspection after repair of these vehicles.

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Mode 6 Diagnostics• Defined as Test results for continuously and non-continuously monitored systems• These can be thought of as sub-tests that each monitor must complete in order to be set to

ready• Mode 6 functionality is defined by the vehicle manufacturers so each year make and model

may be different• Most advanced scan tools have the mode 6 definitions built in to decode TIDs into English

descriptions• Checking the oxygen sensor mode 6 data is important when a catalyst efficiency code is set.

Catalyst efficiency is determined by the oxygen sensors, and sluggish sensors may falsely indicate a catalyst problem when none exists.

• Checking mode 6 data can also be used to try and determine why a particular readiness monitor may not be ready. Look for failed or uncompleted tests associated with the non-ready monitor.

• Mode 6 may also be useful in determining repair effectiveness in monitored systems that require two trips to set. For example, after repairing an evaporative emissions leak, clearing the codes, and performing only one drive cycle, mode 6 data can be reviewed to see if all of the associated EVAP tests have passed. If all of the tests have passed you can be almost certain that the problem was fixed and the MIL won’t come back on once the EVAP monitor is set to ready.

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Catalyst Monitor – Reinspection Requirement• If a vehicle fails inspection for a catalyst efficiency DTC (P0420-P0439) or has

failed a tampering inspection for a missing catalyst, the catalyst monitor mustbe ready upon reinspection.

• In these cases, a flag is set in the vehicle’s inspection record that is not removed until the vehicle passes a reinspection with the catalyst monitor set. This can be confirmed by a message located on the explanation section of the VIR that reads, “The On-Board Diagnostic (OBD) system detected a catalyst fault. To continue with the inspection process, the catalyst should be repaired, required monitors including the catalyst monitor set, and the vehicle reinspected.”

• In some cases, an initial inspection may present as a failure for the catalyst monitor not ready, but no catalyst DTC is present. This is likely because the flag is still present from a prior inspection cycle; the vehicle may have had subpar repairs and was then sold without ever having passed a reinspection with the catalyst monitor set.

• This requirement provides assurance that necessary and appropriate repairs are made.

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Catalyst Replacement Considerations• Catalytic converter replacements can be costly. The decision to choose an

aftermarket vs an OEM converter to save money should be carefully considered, as not all aftermarket converters are effective enough to comply with the OBD system on the vehicle.

• Going cheap is not always a good solution for a durable repair when it comes to catalytic converters. An inferior grade of converter may cause the vehicle to be unable to set the catalyst monitor to ready status, or a catalyst DTC may be thrown soon after the monitor is set to ready.

• The cost vs quality of a converter is important to explain to your customers. Most times, the cheaper option is not the best option and will not be as effective, last as long, or may even result in the vehicle continuing to fail inspection. In such cases, customers must then pay for another, better quality, more expensive repair. The vehicle must be repaired to pass inspection; there are no waivers or bypasses granted in such cases.

• See Module 7 of this course for additional and more detailed information on aftermarket catalytic converters.

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Part 3 – DEP’s OBD Inspection Review Team: Challenging Cases, Known Issues, and Associated Repair Strategies

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DEP’s OBD Inspection Review Team - Overview

• Who we are: Part of the Bureau of Mobile Sources within the DEP. • What we do: Upon request, we analyze the OBD Inspection record(s)

for a vehicle that has failed inspection, and then provide relevant guidance to help prepare the vehicle to pass inspection based on its specific circumstances.

• Who we provide assistance to: • Motorist/Owner of a Failing Vehicle• ERFs/ERTs Repairing the Vehicle• PIFs Inspecting the Vehicle (if the PIF isn’t an ERF, we instruct them

to direct their customer to an ERF for diagnostics/repairs)

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The DEP’s Role – Expertise and Limitations

Our expertise lies in the NJ inspection program rules & regulations, equipment & software, test sequence & protocol, and the interaction between the equipment & motor vehicles during an inspection.We are not automotive mechanics and we do not provide remote diagnostics or individualized repair services.

We can provide the following to help you diagnose challenging cases:• Individual vehicle inspection histories, including for the current and prior

inspection cycles• Comparison analysis to the inspections of vehicles of the same make, model,

and model year• Information on known issues and associated repair strategies• Manufacturer-related repair research• Parts location assistance

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What About Waivers or Bypasses?• A waiver is the issuing of a valid inspection sticker to a vehicle upon

confirmation that the vehicle owner has spent at least a set amount of money on repairs, but the vehicle still fails inspection. The NJ Inspection Program does not have a waiver component or any type of financial assistance program for motorists.

• A bypass is the issuing of a valid inspection sticker to a vehicle upon confirmation that a known issue or other determinant is preventing the vehicle from passing inspection. Most vehicles are not eligible for a bypass and must be repaired to pass inspection.

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Understanding the Inspection Review Process

• With the cessation of tailpipe testing in 2016, there is no longer a “backup” test to fall back on as proof that a vehicle’s emissions system is operating properly.

• Our review process for vehicles that are having difficulty passing the OBD inspection has been strengthened and is focused on extensive data review and research. We also monitor all inspections over time to catch failure rate trends that may indicate potential new issues.

• In the year 2018, only 1 bypass was authorized by the DEP out of close to one hundred review requests. In 2019, no bypasses were authorized by the DEP.

• In most cases, vehicles are repairable with the proper expertise, diagnostic background information, research, and diligence.

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The DEP and ERT/ERF Partnership

The DEP’s OBD Inspection Review Team relies on the automotive training and expertise of ERTs/ERFs to make proper diagnostics and repairs, and we thank you for this service that you provide to the I/M community, motorists, and the environment!

The remaining slides in this module present summaries and associated repair strategies on several known issues that may help you diagnose challenging OBD cases that you come across. We recommend that you become familiar with these issues and refer to these slides as needed.

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Readiness Failure –Communication with Transmission Module

• For a readiness failure that shows only the comprehensive component monitor as ready but all other monitors as unsupported, this is an indicator that the NJ inspection workstation is communicating with the vehicle’s TCM rather than the ECU as it should be.

• Diagnostics should be performed to determine why this is happening.• In some cases, simply attempting a reinspection until the workstation

communicates with the ECU will work.• We typically refer motorists in this situation to choose an ERF that is

also a PIF, so that multiple reinspections can be performed if needed and to verify the repair.

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Comprehensive Component Monitor –Early 2000 Jaguars

• Early Model Year 2000 Jaguars have a specific drive cycle that needs to be performed particularly in order for the comprehensive component monitor and evaporative monitors to run.

• The preconditions and steps that need to be completed to run the monitors are detailed in this Jaguar TSB: Engine Control Module (ECM) Readiness Reporting, dated December 2nd, 2010.

• Tip: Try looking at Mode 6 TID 06 (small EVAP leak) and when that test passes, the monitors should set.

• There is also the possibility that there may be a mechanical issue with the vehicle that prevents the monitors from being set; this would need to be diagnosed and repaired if this is the case.

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Comprehensive Component (CC) Monitor – Mini Cooper• Some early model year Minis have different issues pertaining to setting

the CC monitor to ready. The following “fixes” have been shown to work:• 2003 – Full and proper completion of the drive cycle: 2003 Mini Drive Cycle• 2004 – In some cases a software reflash is needed, followed by full and proper completion of

the drive cycle. See this Mini TSB: Setting OBD Readiness Code Prior to State Inspection, Issued December 2004

• 2005 – A software reflash was able to fix some; since DEP has worked through all of those cases, this vehicle is now on our exclusion list for continuous monitors: NJDEP OBD Exclusion Table, Version Date 11/20/2018

• For other early model year Minis, there is a voluntary recall for fuel system diagnostics that may be a cause for the CC monitor not setting to ready: Mini Voluntary Emissions Recall Campaign 04E-A01: Reprogram DME for Tank Leakage Diagnostics

• Tip – Check Mode 6 for “Not Tested/Failing EVAP Small Leak Detection”

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Fuel System Monitor Change – Model Year 2011+For full details, see DEP’s Fuel System Monitor Advisory, Issued August 14, 2019Issue: You may come upon a vehicle readiness issue in which only the fuel system monitor is not ready.Summary: Beginning with model year 2011, a new CARB OBD regulation was introduced that requires monitoring of fuel system imbalance; the OBD system now requires completion of a drive cycle to set the fuel system monitor.Tip: Completion of a short drive cycle that is essentially the first hill in the FTP has been observed by DEP to be successful in many cases. See advisory above for details.Exceptions: Not all vehicles with an unset fuel monitor will fall under this advisory. Some may require a software update, while others may require other types of diagnostics or repairs.1/29/2020 Version 1a 43

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Fuel System Monitor Reflash –Jeep Compass/Patriot & Jeep Wrangler

• There is an issue with 2012-2014 Jeep Compass/Patriot that fail an OBD inspection for readiness due to the Fuel System Monitor not being ready. See Chrysler TSB Number 18-064-16 REV. A, Date of Issue: September 13, 2016.

• Readiness in these cases will NOT be resolved simply by driving around or completing a drive cycle.

• Customers should be advised to go to a Jeep dealer and have the vehicle's ECU flashed to the most recent version available.

• After the vehicle has been flashed, a drive cycle may need to completed to set the readiness monitors prior to returning for a re-inspection.

• There is no separate TSB, but some 2012 Wranglers are also affected.• The flash should be covered under Jeep’s Emissions Performance Warranty if the

vehicle is within the 8 years or 80,000 miles period. Customers should see their owner’s manual for details; the DEP does not have authority over warranties.

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Premature Catalytic Converter Failures

Below are some known issues regarding catalytic converters that may cause the MIL to come on or a DTC P0420 or P0430 to set. This is not an all-inclusive list.• GM TSB Premature Catalytic Converter Failures PIP5232C, Date of

Issue: Mar 4, 2016• Affected Model(s): 2016 and Prior GM Cars and Gasoline-Powered MST Light

Duty and HD Trucks

• GM Voluntary Emission Recall 16186 – Catalytic Converter Internal Damage, Date of Issue: Apr 27, 2017

• Affected Model(s): 2013-2014 Chevrolet Cruze, Sonic Equipped with 1.8L Engine (RPO LWE)

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DEP’s OBD Inspection Review Team –When to Contact Us

If you are tasked with repairing an OBD inspection failure that proves to be challenging, first ensure that you have:• Read all failure information found on the VIR• Run all proper diagnostic tests• Read through this module of common OBD failure reasons, repair tips,

known issues and repair strategies• Researched manufacturer-specific information, recalls, and TSBs

If you continue to experience difficulties, please reach out to us for an individualized data review:

Phone: (609) 292-7953E-mail: etep@dep.nj.gov

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Slide Number 1Slide Number 2Part 1- New Jersey’s OBD Inspection Test Components and ProcessNJ’s OBD Test – The Basics OBD Testable VehiclesOBD Test ComponentsOBD Test Sequence - Steps 1 & 2 �OBD Test Sequence – Step 3��OBD Test Sequence – Step 4��OBD Test Sequence – Step 5��OBD Test Sequence – Step 6��OBD Test Sequence – Step 7�What is a Passing OBD Inspection?Part 2-OBD Repair: Common Failure ReasonsWhy Did the Vehicle Fail? – �Understanding the Vehicle Inspection Report (VIR)Locating and Reprinting a VIRSample VIRsReinspection TimingCommunication Failures - Potential CausesCommunications Failures �Generic Scan Tool vs Official Inspection WorkstationCommunication Failures – �Troubleshooting TipsCommunication Failures – DLC Pin ChecksMIL On and DTCs Present Readiness Monitors - Overview Continuous MonitorsNon-continuous MonitorsDrive Cycle and Enabling CriteriaLocating Drive Cycle InformationDrive Cycle and Continuous Monitors Readiness ExclusionsMode 6 DiagnosticsCatalyst Monitor – Reinspection RequirementCatalyst Replacement ConsiderationsPart 3 – DEP’s OBD Inspection Review Team: Challenging Cases, Known Issues, �and Associated Repair StrategiesDEP’s OBD Inspection Review Team - OverviewThe DEP’s Role – Expertise and LimitationsWhat About Waivers or Bypasses?Understanding the Inspection Review ProcessThe DEP and ERT/ERF PartnershipReadiness Failure – �Communication with Transmission ModuleComprehensive Component Monitor – �Early 2000 JaguarsComprehensive Component (CC) Monitor – Mini CooperFuel System Monitor Change – Model Year 2011+Fuel System Monitor Reflash – �Jeep Compass/Patriot & Jeep WranglerPremature Catalytic Converter FailuresDEP’s OBD Inspection Review Team –�When to Contact Us