There is no speedometer cable on this car. Either your speed sensor at the transmission has failed (most likely), there is a short in the wire, or the speedometer in the dash has failed (I doubt this is causing the problem). The speed sensor will cost under $200 for parts alone and sits on top of the transmission, my wife was able to switch ours out. Given how easy it is to get at, labor shouldn't be too terrible. If that is indeed the problem, changing the sensor with the battery disconnected should clear all trouble codes and the check engine light will not come back on. **Installation note - ALWAYS disconnect the ground terminal on the battery before removing and installing sensors.** If the check engine light comes back on, you'll need to get it scanned to find what the problem is.
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Check all your fuses, the alero hides fuses in 3 locations open the front doors on the side of the dash board on both sides you will find fuses also in the engine compartment are fuses, this was a bad design on GM's part, they should have put the fuses related to the engine in that compartment and the lights and other interior fuses in the doors..
You could have a faulty speedometer/odometer combination meter causing a false Vehicle Speed Sensor error.
My 1998 Sienna had the following symptoms:
- Speedometer and odometer failed intermittently
- The check engine light would come on and I would get a p0500 code in the OBDII.
- The cruise control would stop working at the same time the speedometer failed.
There is a speed sensor in each one of the tires and they feed the speed information to the ABS ECU. From the ABS ECU the speed signal goes to the speedometer/odometer combination meter, and from there it goes to the Engine Control Module and to the Cruise Control ECU. I could see a signal coming into the speedometer/odometer, but no signal going out. Replacing the speedometer/odometer combination meter fixed the problem.
First, have your ignition timing checked. Have also your EGR checked. if this (EGR) is not functioning properly, engine will lose power. If your engines has a distributor, checked for cracked cap, excessive play in the distributor shaft, and other damaged components. You may want also have your ignition unit and coil checked. Don't forget to inspect the spark plug cables. For the high idling speed, have it adjusted to specification and look for sticking throttle linkage.
P0502 is a Vehicle speed sensor issue:
The vehicle speed sensor outputs a 4 pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.
- Engine Light ON (or Service Engine Soon Warning Light) - Speedometer may not work properly - Transmission shifting problem
- Vehicle speed sensor harness or connectors is open or shorted - Vehicle speed sensor - Combination meter - Faulty ECM.
P0432 - Main Catalyst Efficiency Below Threshold Bank 2 The ECM or PCM monitors the front an rear O2 sensors. The ECM or PCM
detects Warm up Catalytic Converter when the sensors are out of
DTC is set when the ECM or PCM detects rear HO2S value difference
becomes closer to value of front HO2S. The ECM or PCM monitors when
vehicle speed is 25-60 MPH, load is 22-45 percent and engine speed is
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
Possible causes - Warm Up Three Way Catalytic converter deterioration or malfunction. - Exhaust system leaks. - Loose front or rear HO2Ss. - Front HO2S malfunction. - O2 sensors harness or connectors
Possible solution - Replaced Catalytic Converter - Replaced rear O2 sensor - Repair wire harness or connectors
Have you had your mass air meter checked or replaced? This is the unit attached to the air intake hose behind your air filter. It senses the air temperature, speed, density, etc... and adjusts the fuel/air ratio to keep the vehicle running at "peak" performance. Also, check your TPS (throttle positioning sensor) it can also cause the problem you speak of. The TPS adjusts your engine speed/idle etc. and also compensates for hot/cold changes etc. This is roughly a $35.00 part and in most cases usually an easy fix.
if its a manual speedo then it needs changing ,the magnet /spring inside is either worn or dirty inside the unit causing it to drag.as for the engine check light ??? well i do feel you are wasting you hard earnt cash on this stuff i think it is no more than a split in on of the little vacumn tubes running off the inlet manifold to various things .Make sure this vehicle has a 88ºC thermostat fitted and when you have a cold engine drive straight off and dont warm it up`because you are causing more damage to it running it to warm it up .Starting off from cold will cause it to warm up quicker causing less engine wear.The sluggish gearchanges ?? well how old is it and dont you think the gearbox is a bit worn after all this time like us when we get old .
If your CEL comes on but it doesn't store a code sounds like you have a faulty computer board connection,warm up your vehicle then tap on your computer case with a wooden handle of a hammer see if it causes a problem when doing the tap test.