Having problems with your 1998 GMC Jimmy ?
Ignition syytem Jimmy 2 wd will not down shift, transmission has been checked they say it is the ignition system? I take that to be the computer module?
The engine\012AND automatic transmission in this vehicles drive train\012are fully electronically controlled by a computer called the PCM\012(Power Train Control Module). Whenever a problem like this occurs the\012computer stores a record of the problem (there are of course some\012exceptions to this, like the fuel pump, engine coolant temperature\012sensor and MAF sensor for instance) in the form of a fault code in\012its memory, to read these fault codes you must have the systems\012memory scanned with a special tool. Once the fault code(s) are read\012you then must perform the appropriate diagnostic testing to find and\012resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A\012TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR\012HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.