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A temp sensor information is used for all kind of things even on 1999 vehicle . The PCM/ECM -engine computer use temp info for fuel control strategy , turning on the radiator cooling fans , information for the temp gauge . The temp. sensor really doesn't control anything , it's a input to the engine computer , the engine computer controls thing's . How Engine Coolant Temperature Sensors Influence The Modern Powertrain
Hi Steve , your vehicle has electronic throttle control . I don't know if you are aware of this. The gas pedal have position sensors an a wiring connector with 4-6 wires .these wires are connected to the engine computer . an there is a electric motor on the throttle body assembly , the computer opens an closes the throttle . You probably have codes stored in the engine computer .
Reduced Engine Power Mode
When the PCM detects a condition with the TAC system the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
Forced idle mode--The control module will perform the following actions:
Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.
Ignore accelerator pedal input.
Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.
A few Japanese car makers, maybe others too, use different terminology for the same system that today manages all vehicles, the computer controlled engine management system. The ECU -Electronic Control Unit- is the computer of the system, has a lot of sensors, and output switches and controls to run the engine under all operating conditions. Just like other makes, American cars for instance, call the computer the ECM - Electronic Control Module, or sometimes PCM- Powertrain Control Module. Different terminology, but all mean the engine computer. Now that computers are proliferating in vehicles- computers to run many different systems-the engine computer is considered the primary computer on the car. The ECU in your case.
Electronic Control Module, the engine management computer in plain English, the brain box in slang; some car makers call theirs an ECU (Electronic Control Unit), or a PCM (Program Control Module, or Powertrain Control Module), or ECM (Electronic Control Module). May even be other names for them. The engine computer uses several sensors (as inputs) to compute fuel requirements and spark timing (ignition timing) needed for the operating conditions at that moment, then it sends signals to controllers and switches (outputs) to run the engine at optimum efficiency.
This code indicates that the Transmission control module (TCM) has asked the engine control computer (PCM) to turn on the check engine light to alert you to a problem in the automatuc transmission, you must now have the TCM scanned for the actual fault codes.
ECU (engine control unit), ECM (engine control module), PCM (power train control module) VCM(vehicle control module). Basically your vehicle's computer. There are independent shops with the hability and the technology to reprogram it but for sure your manufacturer's dealer.