Question about 1992 Geo Metro
If the car does not go over 45 mph, then it is probably in limp mode. Limp mode means that the transmission control module detected a problem, and the transmission is restricted to the lower gears only. If car is not in limp mode, then problem is still likely the transmission. In that case a faulty Throttle Position Sensor will return a wrong feedback to the transmission controller. The result is car not shifting up.
If problem was misfire, as you have assumed, you will notice the check engine light on. Doing a code scanning the misfire would be reported as a P0300 , or P03xx code.If there is misfire and distribution is OK, then there is a major problem with valves and rings. I do not think that the problem is misfire.
The first action is doing a code scanning. A partial code scanning can be done for free at Autozone. Autozone can only do a scan on the main computer, which will may return a code P0700 (see code p0700 after an OBDII scan.) P0700 means that an additional scan must be done on the transmission dedicated module. If there is a code P0700 (do free test first), a full scan canl be done at the dealer or at a Suzuki authorized garage.
Generic OBD II scan like the one done at Autozone is done using one of these: Code Reader Plus.
Complete scan is done using a different (and far more expensive) scan tool than the one used at Autozone to do a generic OBD II scan. Standard charge for a full code scanning is $80.
If there are no codes the parts that can be responsible must be tested.
Before doing anything else, check transmission fluid. If it is dark brown or if level is low, replace it.
The most common fault causing the problem is a defective TPS ( throttle position sensor). Test must be done using a multimeter.
The TPS can be tested by reading volts at its terminals while someone else is pushing down the accelerator pedal. If voltage has gaps (in your case this is likely the result), or if voltage does not change smoothly, then the TPS must be replaced.
Other part that can be responsible is the speed sensor, mounted on the transmission. This part is more difficult to test, and gets usually replaced.
The transmission is operated by an array of solenoids called solenoid pack. The solenoids are located inside transmission, in the valve body. The solenoids are tested using an Ohm meter.
Wiring to solenoid pack must also be checked reading volts while problem happens (mechanic will put car on lifter).
If there is nothing else, then the TCM itself (a computer) may be itself the culprit. Before replacing the module, it must be tested. First part to check is its grounding and the connector pins.
As said, the culprit is likely the TPS. That is the first part to test. Do also a code scanning to see if there are codes stored.
Posted on May 18, 2011
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Posted on Jan 02, 2017
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