Why did my check engine light go off on its own?
A check engine light will shut itself off if the condition that caused it is remedied. So, if your converter is marginal, and you did a lot of stop-and-go driving, which creates high demand for the converter, that may have turned on the check engine light.
Why does my Jeep Cherokee have no spark?
I have no communication to the computer with a scanner, no check engine light, no 5 v reference, no spark. I have tried to manually pull codes with the key. The dealer says that it does not have an immobilizer by the VIN number. I have power and grounds to the PCM connectors.
Can you reset a check engine light without a scanner?
If you decide to disconnect the battery I have an important tip for you. Most vehicles from 1996 and newer have a keep alive memory built-in to the computer system. Disconnecting the battery alone will not reset the check engine light. The computer will be able to hold the memory and the code for several minutes and in some cases several hours.
What to do when your Jeep Cherokee won’t start?
The first thing to check when the engine won’t start is to see if you have spark at the spark plugs. When the car won’t start and you have a spark at the spark plugs then the problem would most likely be in the fuel system. Checking fuel pressure would be next and also checking to see if you have an injector pulse at the fuel injectors.
Where is the ignition switch located on a Jeep Cherokee?
When the ignition switch is in either the START or RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A21. Circuit A21 powers circuit F99 through PDC fuse 18.
How to check for diagnostic trouble codes on a Jeep Grand Cherokee?
If you own a 1999-2010 Jeep Grand Cherokee, and your ‘Check Engine’ light is on, you can easily check for Diagnostic Trouble Codes (DTC’s) without a scanner using just a simple key sequence. Steps. Get into your vehicle and make sure the hood, rear tailgate, and all doors on your vehicle are shut.
What to do if check engine light is on but no code?
Check the make and model of your reader to see what it is built for and if all else fails, head into a parts store and they should be able to read the issue at no cost to you. No code being generated on the reader does not mean the driver is in the clear.
Is there a scanner that can read OBD codes?
Both wires terminate in one ring terminal attached to the engine block at the oil dipstick tube bracket attach stud. It’s called G102. Will check this out – I too cant read codes with my scanner although the scanner works perfectly on my other car…Thanks You should check the two grounds (4&5) in the engine bay.
Why is my Jeep PCM not working properly?
If the problem was only with the scanner connection, the jeep would at least run normally. Now these 2 problems combined would lead to think that there is some electrical connection problem with the PCM. I would disconnect the battery and then disconnect and clean the PCM connectors with electrical contact cleaner.