Turn the ignition key to the KOEO or KOERUsing. Select Readthe

Codes and press ENTER. CodeScanner®

If there are no codes stored in vehicle memory, a “System

Pass” message displays.

If codes have been stored in vehicle memory, then the num- ber of codes and type display (i.e. = 1 of 3 ;). Press the DOWN arrow to view the codes. The definitions for Global (Generic) DTCs display with the code number. Manufac-

turer-specific DTCs display the code number, and a message identifying the system and to refer to a service manual.

Press the BACK key when done.

NOTE: Changing any part without first isolating the circuit or system may result in the replacement of good components.

Erase Codes

The Erase Codes function deletes the DTCs from the vehicle’s memory. Perform this function only after the systems have been checked completely and DTCs have been documented. This function should be performed with KOEO - Do not START engine. An error message will usually display when performing this function with KOER.

After servicing the vehicle, delete the stored DTCs and verify no codes have been reset. If DTCs return, the problem has not been corrected or other faults are present.

The Erase function also erases freeze frame data, O2 sensor test data, system moni- tors, and on-board monitoring test results, which may be accessed by other Scan Tool type equipment.

Select Erase Codes and press ENTER. Press YES to erase the codes or NO to retain the codes. If NO is chosen, a “Erase Command Cancelled” message appears.

Once YES is selected, the function cannot be interrupted. Make sure to choose YES only if codes are to be erased permanently. A message displays stating that “No Codes Remain” or the number of DTCs that remain in memory.

If DTCs still exist, the number will be displayed. The faults must be repaired to remove these DTCs. Press ENTER to return to the Main Menu. Press the BACK key when done.

MIL Status

The MIL (Malfunction Indicator Lamp) Status function displays the state of the computer module that commanded the MIL to turn on. A request is sent to the computer module(s) to state whether they are commanding the MIL to turn ON. If the MIL Status is ON and the MIL is not illuminated with the engine running, then a problem exists in the MIL circuit. Refer to “Diagnostic Circuit Check” in the service repair manual.

NOTE: Some manufacturers will turn the MIL Off if a certain number of drive cycles occur without the same fault being detected. The DTCs related to a MIL are erased from the computer’s memory after 40 warm-up cycles if the same fault is not detected.

Select the MIL Status function and press the ENTER key. The MIL Status displays on the top line and a scrolling message on the bottom indicating if the MIL lamp should be ON or OFF. When done, press the BACK key.

I/M Monitors

The I/M (Inspection and Maintenance) Monitors function displays the state of the vehicle’s OBD II Monitors. Monitors test the operation of emission related systems or compo- nents and detect out-of-range values. The vehicle may have to be operated under cer- tain driving conditions to initiate a monitor.

Currently, there are eleven OBD II Monitors defined and required by the U.S. Environ- mental Protection Agency (EPA), but not all monitors are supported by all vehicles.

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Actron 9040 manual Erase Codes, MIL Status, Monitors
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9040 specifications

The Actron 9040 is a highly regarded automotive diagnostic tool designed to provide users with an efficient and reliable means of troubleshooting vehicle problems. Its user-friendly interface makes it suitable for both novice users and experienced technicians, enabling it to effectively cater to a diverse demographic of automobile enthusiasts.

One of the main features of the Actron 9040 is its compatibility with a wide range of vehicles. Supporting both OBDI and OBDII protocols, this scanner can work with vehicles from 1996 onward, making it an invaluable tool for diagnosing issues across many makes and models. Its broad compatibility ensures that users can take full advantage of its diagnostic capabilities.

The device boasts a large, easy-to-read LCD screen that displays diagnostic codes and live data in real time. This functionality allows users to visualize how various sensors and systems are performing while the vehicle is in operation. Additionally, the Actron 9040 reads and clears diagnostic trouble codes (DTCs), which can help to quickly identify issues and reset the “Check Engine” light after repairs have been made.

Advanced features of the Actron 9040 include onboard monitoring of various vehicle systems, such as the engine, transmission, and emissions system. This helps users to pinpoint specific problems and assess the overall health of the vehicle. The tool also includes a built-in code library, providing users with detailed definitions of trouble codes, making the troubleshooting process more intuitive.

The Actron 9040 utilizes easy-to-understand menus and prompts, streamlining the diagnostic process. The device is powered through the vehicle's OBDII port, eliminating the need for batteries or external power sources. This design enhances portability and ensures that users can perform diagnostic checks even in remote locations.

In conclusion, the Actron 9040 combines advanced diagnostic technologies with user-friendly features to create an essential tool for anyone involved in vehicle maintenance. Its multi-vehicle compatibility, real-time data monitoring, and in-depth diagnostic capabilities make it an exceptional choice for both DIY enthusiasts and professional mechanics alike. With the growing complexity of automotive systems, tools like the Actron 9040 are crucial for effective vehicle maintenance and repair.
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