HO2S – Heated Oxygen Sensor. IAT – Intake Air Temperature. ISO – International Standards Organization OBDII communication mode, used by Chrysler. List of supported OBD-II parameters and sensors by OBD Auto Doctor OBD2 scantool software. $14 – $1B, Oxygen sensor output voltage, Short term fuel trim. Oxygen Sensor Drive Cycles The following are some sample drive cycle requirements for the oxygen sensor monitor to run: Ford: The monitor should run when.

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Scanner software for a laptop, tablet or personal computer PC or a smart phone app. If your vehicle has this style connector, but doesn’t have these pins populated, you probably have a pre-OBD-II vehicle. That’s why a labscope is needed because it helps to pinpoint the failure as it “sees” the signals traveling in the electrical wiring of the car. PID Example Figure This function includes clearing not only the DTCs; but also the freeze-frame data, all stored test data, and it resets all monitors and turns off the check engine light.

Begin to monitor the following PIDs: Choices here include ultrasonic leak detectors that listen for sound waves produced by air or vapors escaping through an opening, smoke detectors that generate smoke which allows leaks to be spotted visually, and dye detectors that use a visible or ultraviolet dye to reveal leaks.

OBD II hardware breaks down into two categories: Exhaust pressure Exhaust pressure sensor bank 1 – 2. Lambda Sonde The sensor contains various precious metals, and can be contaminated by fuel or oil, carbon a combustion by-productor anti-freeze.

OBD-II Acronyms and Jargon

For example, the DTC P means “cylinder 2 misfire detected”. Sensor 1 – Sensor 4. A single misfire will cause a subtle change in the speed of the crank. This second lambda sensor gives bego ECU an indication of how well the catalytic converter is working. Controller Area Network, CAN, is a communication system whereby multiple nodes connect to and communicate over a bus.


Engine coolant temperature Sensor 1, 2. Accessing the OEM-specific enhanced codes may require using a dealer scan tool, which can be very expensive. Also, if a fault is found during any test, it may prevent subsequent monitors from completing. A repair technician can then ascertain the status of various vehicle systems by connecting a ‘scan tool’ to the standardized connector, the Diagnostic or Data Link Connector.

When executing the procedure for this monitor, stay in part throttle mode and drive in a smooth fashion to minimize “fuel slosh”.

For example, it can say that a temperature sensor is low or high, but it won’t tell you if the cause is a wire, connector, an ECU or the sensor itself.

Supported OBDII parameters

Executes the EGR Monitor. In this concept, faults are picked up by a monitoring technology and reported to a regulator, and the vehicle owner is then directed to get further testing and possible repairs. Depending on the vehicle application, this usually includes completing the oxygen sensor monitors first, followed by driving at highway speeds 60 to 65 mph for at least 10 to 15 minutes under light load, no conflicts with other monitors that have not yet run such as EVAP or EGR monitors which yego have to complete before the catalyst monitor will runand no fault codes that could affect the accuracy of the test.

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Oxygen sensor – referring to the fact that the Lambda Sensor measures the Oxygen present in the exhaust gas stream O2 sensor – back to school for this one – O2 is the chemical symbol for an Oxygen molecule.

This checks the sensor hegk circuit. Get the latest news, tech tips and diagnostic techniques delivered straight to your in box. OEM scan tools do it all, including PCM reprogramming, and bi-directional two-way communication and system testing. With some exceptions, the OBD II warning lamp will also go out if a problem does not recur after 40 drive cycles.


Determines if a pending code is preventing the clearing of P Engine Installed Sensors Figure Boost pressure Negative values represent vacuum Positive values are boosted by a turbocharger or supercharger Calculated, estimation. Repeat the last two steps five heyo.

Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run. The oxygen sensor monitor should run after idling the engine for nine minutes, then driving at a steady 25 mph for two minutes.

OBD II Engine Diagnostics

There is a separate section with more on catalytic converters later. Now this introduces us to a new heego Parameter IDs, PIDs, that are codes used to requests data from li vehicle, used as a diagnostic tool. Perform acceleration steps only on highways. This mode retrieves powertrain trouble codes, also known as P codes.

This means the vehicle has to be driven to reset all the readiness flags. So, even though a malfunctioning component may not seem to cause an emission increase during some conditions, it probably does under other driving conditions. Li II will detect emissions problems that might not cause a vehicle to fail a tailpipe test.

Otherwise, rerun Check any incomplete monitor. Let off the accelerator pedal. DTCs are fully explained in subsection 3.

Scanning OBD-II signals can also provide valuable information on the condition of a used car purchase. To complete a specific monitor for repair verification, follow steps 1 through 4, and then continue with the step described by the appropriate monitor found under the “OBD-II Monitor Exercised” column. When a fault occurs, OBD II logs hsgo code and records all related sensor values at that moment for later analysis.