How to check monitors without a scan tool This is usually accomplished after fifty to one-hundred miles of normal driving. In most cases, a vehicle with incomplete readiness monitors will not pass the California smog inspection (See New Readiness Monitor Standards For OBD II Functional Inspection).ĭriving the vehicle under conditions that meet the monitor enabling criteria should complete most OBD II monitors. If the PCM loses power for any reason (Including a disconnected or depleted battery), or if diagnostic trouble codes are cleared using a diagnostic scan tool, readiness monitors will indicate an incomplete, or not ready, status. If a fault is detected, the power train control module (PCM – The computer) illuminates the malfunction indicator light (MIL – Check Engine – Service Vehicle Soon). These checks are performed in the background during normal driving and are designed not to interfere with vehicle performance or safety. On 1996 and newer model year vehicles, the on board diagnostic system (OBDII) performs up to eleven diagnostic checks of vehicle emission control systems. This can often be necessary in order to determine if your car is ready for its California smog inspection. It is possible to check OBD II monitor readiness on many late model vehicles without connecting a scan tool.
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