The OBD1 scanner is used to read the trouble codes in vehicles manufactured between 1982-1995. It utilizes two tests to read the error codes recorded by the ECU (engine control unit).
They are the “Key On Engine Off” test and the “Key On Engine Running” test. To perform this test, you should first locate the diagnostic box within the engine compartment and ensure the engine is warmed up before starting the test.
Related article:
https://www.autonumen.com/blog/2022/02/01/how-to-read-ford-obd1-codes-without-a-scanner-self-test-procedure/
Here is the procedure of reading OBD1 codes on Ford using Innova 3145:
* Uncover the EEC Test case and plug in the code reader.
* The first test is the key on engine off. It begins by starting the vehicle’s electronic components without cranking up the engine. Next, it proceeds as indicated.
* Switch on the code reader, then press and hold the test button to begin the test. An arrow should show up on the display screen of the code reader to indicate that the OBD1 scanner has successfully connected to the ECU.
* It takes about 10 seconds for the codes to start displaying on the display panel. Record the said codes using a pen and paper.
* Next, the OBD1 will display a 10 to indicate no more readable codes, then code 111 indicating that the test is complete. After this step, you can switch off the code reader.
* Finally, you will perform a “Key On Engine Running” test, which proceeds as follows.
* Crank up the engine and turn on the code reader. Press and hold the test button to commence the process.
* The first display shows the number of cylinders the engine has. Next, you will perform the series of steps discussed below to negate corresponding errors. Do a half turn if your car includes a power steering, press the cancellation button if your vehicle provides overdrive, and hold the brake pedal if your vehicle has an on and off brake switch.
* The code “10” will appear then you’ll have to wait for another 30 to 60 seconds for the codes to appear on display.
* Record the error codes on a piece of paper. Finally, a “10” would display once more to indicate no more readable codes, then code 111 indicating the end of the test. Switch off the code reader and the engine after this.
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