Question about 1999 Chevrolet K1500
I had problems with my ecm (mouse chewed insulation off some wires) not starting the fuel pump, I bypassed ecm using a relay so my fuel pump comes on with the ignition. Now my transmission shifts extremely hard
Sounds like the mouse chewed more than just your fuel pump wiring. How hard your transmission shifts is controlled by the PCM, controlling the force motor inside the trans. There should be some troublecodes present in the PCM that may help you pinpoint the problem. You can also hook a scanner to your vehicle to see what it is doing.
There could also be internal mechanical or electrical problems with your transmission. A scanner with bi-directional controls can help you determine whether your problem is electrical or mechanical. These transmissions are known to break springs and plastic pistons in the valve body. Also, if your transmission shifts hard in all gears, including shifting into reverse, your sun shell may break. When this happens, you will loose R, 2nd & 4th gears, leaving 1st and 3rd.
As preventive maintenance, installing a shift kit, e.g. SK4L60E from Transgo, and replacing the plastic accumulator pistons with ones made of aluminum may correct your mechanical problems.
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Posted on Jan 02, 2017
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Aug 08, 2016 | Cars & Trucks
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exceptions to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.
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