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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So, just because there are no leaks, doesn’t mean the exhaust system will be noise free. OBD II has been required on all new passenger cars and light trucks sold in the United States since model yearincluding all imports.

Turbocharger compressor inlet pressure Turbocharger compressor inlet pressure sensor A and B Injection control pressure Ik and B.

Lambda Sensors – HEGO, EGO, and other terminology

If the P code must be cleared in these conditions, the PCM must detect them once twice on some applications before the EVAP monitor can be “bypassed” and the P cleared. You may want to complete the drive cycle times. A standardized pin Data Link Connector, DLC, with specific pins assigned to specific functions, standardized electronic protocols; standardized Diagnostic Trouble Codes, DTCs, and standardized terminology were outlined.


If the catalyst Catalytic Converter is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst, or in order to Complete the CAT Monitor. Diesel particulate filter DPF temperature Inlet temperature, bank 1 – 2 Outlet temperature, bank 1 – 2. Things like short term fuel trim, throttle position and engine speed can change and not be correct in freeze frame data. Some Hfgo vehicles have had rear sensors since A single misfire will cause a subtle change in the speed of the crank.

In some cases, it may even be necessary to complete the prescribed drive cycle several times before the catalyst monitor will run.

DTCs are fully explained in subsection 3. Now hold your vehicle speed steady at 55mph for three minutes. For all comprehensive components, the MIL is required to illuminate when any individual component is out of specification or fails to work when commanded. The second byte is something referred to as the target. General Motors implemented both a heo connector and a 12pin connector, with the 12 pin iii being used in the vast majority of GM cars, while Lotus implemented a pin connector.

OBD II Engine Diagnostics

OEM scan tools do it all, including PCM reprogramming, and bi-directional two-way communication and system testing. Catalyst temperature Bank 1 – 2: No code book is needed.

For such a small leak, you need a smoke or dye-type detector. For example, if the catalyst monitor is designed to run only when the vehicle is within a certain vehicle speed range, the vehicle speed sensor needs to be monitored.


A basic These inexpensive tools, software and apps can display fault codes but little else. Once you have pinpointed the problem and hopefully replaced the faulty component, the final step is to verify that the repair solved the problem and that the. On Subarus, turning the key off will clear all io readiness flags.

A general look for these sensor and components is provided in the next page figure A look at J Only the parameters supported by the car will be shown in the software. As a result of this standardization, a single device can query the on-board computer s in any vehicle. But the drawback is price. The “Check Bod Light” on your dash. You need to learn how to distinguish good waveforms from bad ones – which means looking at vehicles that do not have problems as well as ones that do.

If not, go to step Let off the accelerator pedal.

Freeze frame data is a snapshot of the real-time sensor feeds at the time of a DTC condition. Brett 22 years of experience.

Environmental Protection Agency, October