No check engine light?
How can i see if theres any issues with my engine through the computer in my car?? None of my dash lights are on but how do i know if my engine is messed up or if its over heating?? 88 deville 4.5
0
Comments
Then the fun really starts. It will show you the initials for one of the vehicle modules such as the ECM or BCM with a question mark. If you want to look into the BCM you push the "Hi" blower button while BCM is displayed. Then it will ask you if you want code, data, or bi (for bidirectional controls). When the one you want is displayed you press the "Hi" again and it will take you to that function. Then again using the Hi or lower button will let you scroll through the data or controls depending on what you selected.
The ECM (engine control module) will work the same way, but there are hundreds of pages of information that you must go through in order to know what data you are looking at, so even though I could describe it nothing will work as good as grabbing a service manual and just doing it.
The 7.0 is displayed after codes are displayed indicating that the system is ready for the next command. When you got to E 9.5, you had pushed the "Hi" button while the 7.0 was displayed. That took you to ECM output cycling. If a technician is working on the car and analyzing a given system that the ECM controls. E 9.5 can be entered and now the ECM will keep turning everything that it controls on and off, which allows the technician to analyze a given circuit (system) independent of normal engine operating conditions.
There are hundreds of pages to this onboard diagnostic system in the service manual. You will have to have the manual and follow it to make sense of it all.