Does My Car Have OBD-II?All cars and light trucks built and sold in the United States after January 1, 1996 were required to be OBD II equipped. In general, this means all 1996 model year cars and light trucks are compliant, even if built in late 1995.Two factors will show if your vehicle is definitely OBD II equipped:1) There will be an OBD II connector as shown below, and2) There will be a note on a sticker or nameplate under the hood: "OBD II compliant".The Connector

Pin 2 - J1850 Bus+Pin 4 - Chassis GroundPin 5 - Signal GroundPin 6 - CAN High (J-2284)Pin 7 - ISO 9141-2 K LinePin 10 - J1850 BusPin 14 - CAN Low (J-2284)Pin 15 - ISO 9141-2 L LinePin 16 - Battery PowerWhere is the connector located?The connector must be located within three feet of the driver and must not require any tools to be revealed. Look under the dash and behind ashtrays.The Five Flavors of OBD IIWhile the parameters, or readings, required by OBD II regulations are uniform, the auto manufacturers had some latitude in the communications protocol they used to transmit those readings to scanners. Naturally, each felt they had the one true way, so we have five different OBD II communications protocols in use.The big scanner consoles costing thousands of dollars include the decoding software and firmware for all five protocols in their units, making them universal. Less expensive units, for home or small shop use, are usually customized for a specific communications protocol. Be sure the scanner you are using suits the protocol of your car.What Communications Protocol does my vehicle use?As a rule of thumb, GM cars and light trucks use SAE J1850 VPW (Variable Pulse Width Modulation). Chrysler products and all European and most Asian imports use ISO 9141 or KWP2000 circuitry. Fords use SAE J1850 PWM (Pulse Width Modulation) communication patterns. All 2008 and newer model year vehicles use CAN.There are some variations among captive imports such as the Cadillac Catera, a German Opel derivative, which uses the European ISO 9141 protocol. If you have first hand knowledge of other such variations, pleasesend them inand, together, we can build a more complete listing.On 1996 and later vehicles, you can tell which protocol is used by examining the OBD II connector: J1850 VPW--The connector should have metallic contacts in pins2, 4, 5,and16,butnot 10. ISO 9141-2/KWP2000--The connector should have metallic contacts in pins4, 5, 7, 15,and16. J1850 PWM--The connector should have metallic contacts in pins2, 4, 5, 10,and16. CAN--The connector should have metallic contacts in pins4, 5, 6, 14and16.If your vehicle has this style connector, but doesn't have these pins populated, you probably have a pre-OBDII vehicle. To add some confusion, even having the connector with the contacts shown above is not a guarantee of OBD II compliance. This style connector has been seen on some pre-1996 vehicles which were not OBD II compliant.Information on Pre-96 CarsA reader with the California Air Resouces Board provided this list of pre-96 OBD II engine designations. Note that CARB recognizes engine series, rather than vehicle models, so the engine designations are the true key, with the vehicle models provided as a courtesy.California Air Resources Board List ofCertified OBD II Complying Engine Families and ModelsEngine FamilyManufacturerModel(s)Fully Compliant?

1994 Model Year Certifications

RAD2.8V8GFEMRFM3.8V8G1EKRFM4.6V8G1EKRMB2.2VJGCEKRMB3.2VJGCEKRNS2.0VJGDEKRTY3.0VJGFEKRTY2.7HGEEKRTY2.42HGEEKRVW2.8V8GFHMRVV2.3VHGFEKAudiFordFordMercedes-BenzMercedes-BenzNissanToyotaToyotaToyotaVolkswagenVolvo100MustangT-Bird, CougarC220C 280, S 320, SL 320G20Camry, ES300T100Previa, Previa All-TracCorrado850 TurboNoNoNoNoNoYesNoNoNoNoNo

1995 Model Year Certifications

SBM5.4V8GAEKSCR2.0VJGFEKSCR122VJG2EKSCR2.0VJG2GKSCR2.0VJGFELSDS2.0VJGFEK

SFM3.828G1EKSFM3.8V8G1EKSFM4.6V8G1EKSFM4.6V8G1GK

SFM2.318G1EKSFM3.028G1EKSFM3.018G1EKSFM3.028G1FKSFM4.018G1EKSFM4.6VJG1EKSFM4.028G1EKS1G3.8V8G1EKS3G4.319GFEJS3G4.329GFGJSIG2.3VJG2GKSHN2.7VJG1EKSHN2.7VJGFEKSHN2.5VJGKEKSHN3.0VJGKEKSJC4.0VJGAEKSJC6.0V8GFFKSJC4.0VJGFEKSKM1.8VJG1EKSTK2.3VJGFEKSTK2.5VJGFEKSTK1.5VJG2EKSTK1.8VJG1EKSFM2.318G1EKSFM3.018G1EKSFM3.028G1FKSFM4.018G1EKSFM4.028G1EKSMB3.6VJGFEKSMT1.5VJG2EKSMT1.8VJG2EK

SMT2.4VJG2EKSNS2.4VJGFFKSNS2.0VJGFFKSNS3.0VJG1EKSNS3.0VJG1FKSNS2.4VJG2EKSNS1.6VJG2EKSNS2.0VJGFEKSNS3.0VJG1EKSLR4.0H8GOEKSFJ2.2VJGFEKSTY3.41JG1GKSTY3.42JG1GKSTY3.0VJGFEK

STY2.42HGJEKSTY2.71HGEEKSTY1.5VHGFEKSTY4.0VJG1GKSTY2.41HG1GKSTY2.71HG1GKSTY3.41JGFEKSTY3.42JGFEKSTY4.55JGFEKSVV2.3VJGFEKSVV2.4VJGFEKBMWChryslerChryslerChryslerChryslerDiamond Star

FordFordFordFord

FordFordFordFordFordFordFordGMGMGMGMCHondaHondaHondaHondaJaguarJaguarJaguarKIAMazdaMazdaMazdaMazdaMazda*Mazda*Mazda*Mazda*Mazda*Mercedes BenzMitsubishiMitsubishi

MitsubishiNissanNissanNissanNissanNissanNissanNissanNissanRoverSubaruToyotaToyotaToyota

ToyotaToyotaToyotaToyotaToyotaToyotaToyotaToyotaToyotaVolvo (TC)Volvo750cl(V12), 850ci(V12)Dodge Neon, Plymouth NeonDodge Neon, Plymouth NeonDodge Neon, Plymouth NeonDodge Neon, Plymouth NeonEagle Talon, MitsubishiEclipse, Chrysler Sebring,Dodge AvengerWindstarMustangT-Bird, CougarGrand Marquis, Town Car,Crown VictoriaRangerWindstarRangerRangerRangerContinentalRangerCamaro, FirebirdS10 Pick-Up, Jimmy, BlazerS10 Pick-UpCavalier, SunfireAccord LX, EX (V6)Accord LX, EX (V6)TLNSXAJ16 (SC)V12XJSSephiaMilleniaMilleniaProtegeProtegeB2300B3000B3000B4000B4000S 320, C 280, SL 320Summit, MirageSummit, & Summit Wagon,Mirage, Expo, LRVSummit Wagon, Expo, LRV240 SXG20MaximaMaximaAltimaSentra/200 SX200SX SE-RMaximaRange Rover New ModelLegacyT100 2WDT100 2WD & 4WDCamry, Camry Wagon,ES300, AvalonPrevia, Previa All-tracT100 2WDTercelLS 400Tacoma 2WDTacoma 4WDTacoma 2WD/4WDTacoma 4WDLand Cruiser850 Turbo Sedan/Wagon850 Sedan/WagonNoNoNo

NoNo

NoNoNoNo

NoNoNoNoNoNoNoYesNoNo

YesYesYesYesYesNoNoNoNoNoNoNoNoNoNoNoNoYesNoNo

NoYesYesNoNoYesYesYesNoNoYes (A/T models only)YesYesYes

NoYesNoNoNoNoNoNoNoNoYes

A note accompanying this list indicated that certification is for the engine group only. The models listed are believed correct, but the engine is the deciding factor.

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Sensor Reference Guide Oxygen Sensors (O2) Throttle Position Sensor (TPS) Mass Air Flow Sensor (MAF) Engine Coolant Temperature Sensor (ECT) Intake Air Temperature Sensor (IAT) Exhaust Gas Recirculation (EGR)Most Common Engine Sensors understand the purpose and failure systems of most common sensors. Use your scantool and tech tip to diagram.Oxygen Sensors (O2)Purpose: Measure the amount of oxygen left in the exhaust stream to provide feedback to the computer about whether the air/fuel mixture is rich or lean.Symptoms: Poor fuel economy Rich fuel mixture Check Engine Light Failed emissions testTech Tip: Test for O2 sensors in front of catalytic converter (S1B1 and S1B2 on your scantool).With the engine warm, graph the O2 sensor output. Rev the engine to approximately 2000 RPM. A good sensor will oscillate from below 0.2 volts to above 0.8 volts, looking approximately like a sine wave. A bad sensor will be flat-lined and show no response to snapping the throttle. Test for O2 sensors behind the catalytic converter: Graph the rear and the front O2 sensor output. Rev the engine to approximately 2000 RPM. The front sensor will be oscillating actively. The rear sensor should show little reaction and stay at a midrange value (approximately 0.5 volts). If the sensor is flat-lined at zero volts, it has failed. If the rear sensor follows the oscillations of the front sensor, the sensor is good but the catalytic converter has failed.Symptoms: Oscillating front Midrange backTech Tip: The computer compares the front and rear O2 sensors. A bad front O2 sensor can cause a rear sensor DTC. Never replace any O2 sensor without testing it first.Throttle Position Sensor (TPS)Purpose: Tells the computer what the throttle position isSymptoms: Stumble or hesitation on accelerationTest: With the key on, engine off, graph the throttle position sensor output. Gradually press the accelerator to full throttle. The graph should ramp smoothly with no spikes or drop-outs.Tech Tip: Most Throttle Position Sensors wear out just off the idle position.Mass Air Flow Sensor (MAF)Purpose: Measures how much air is flowing into the engineSymptoms: Poor fuel economy. misfires, stumbles, hesitationTech Tip: Graph the MAF sensor voltage on your scantool. With engine at idle, a steady voltage should be visible on the graph. Tap lightly on the sensor housing. A good sensor will not react to the vibration. If the graph jumps, the sensor is bad and needs to be replaced. Next rev the engine and verify that the graph climbs smoothly in proportion to engine speed. A jump or slow-reacting graph indicates a failed or dirty sensor.MAF related trouble codes are often caused by a leak in the air ducts leading to the sensor. If the MAF sensor is fouled it can often be cleaned with an aerosol electronics cleaner.Engine Coolant Temperature Sensor (ECT)Purpose: Tells the computer if the engine is warmed upSymptoms: Poor fuel economy Poor performanceTech Tip: After sitting overnight, the Engine Coolant Temperature should equal the air temperature. As the engine warms, it will rise steadily to 200 to 230 degrees Fahrenheit.Intake Air Temperature Sensor (IAT)Purpose: Tells the computer the temperature of the incoming air used to calculate the air density and fine-tune the air/fuel mixtureSymptoms: Poor economy, stalling or rough idle when coldTech Tip: The Intake Air Temperature Sensor will read approximately equal to the outdoor temperature when the vehicle is moving. Most common cause of trouble codes related to the IAT are a bad connection, or a sensor left disconnected after servicing the air filter.Exhaust Gas Recirculation (EGR)Purpose: While the EGR doesnt typically have its own sensor, the system is important and a common cause of Check Engine Light problems. The EGR system mixes a controlled amount of exhaust gas with the intake air to properly control the combustion processSymptoms: Failed emissions test, detonation (pinging) under accelerationTech Tip: If the EGR valve is vacuum controlled, graph the MAF and front O2 sensors. With engine at idle, manually open the EGR valve (do not manually move an electrically driven EGR valve) and watch for reaction of the MAF and/or O2 sensors. If there is no reaction, the EGR passageways or the valve itself are likely to be clogged and need to be cleaned.