Question about 1985 Toyota Celica Supra
I just put a throttle position sensor on it and cleaned injectors still idles up and down and it dose not accelrate right
85 celica hesitation ture acceleration and no power when i set the timing to 5dehree
Posted on Jan 21, 2012
I would think that the TPS is not adjusted correctly. Move it until the idle stops fluctuating and advise how it runs.
The TPS does 2 things...It tells the computer the opening of the throttle plate, and it also sends a signal to the computer when the throttle plate is closed. If the TPS has the closed throttle switch activated, and the throttle plate is open, the ECU will fluctuate the idle up and down.
Posted on Jan 23, 2009
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Cherokee, Grand Cherokee, 1999-2005
Throttle Position Sensor
The 3 wire Throttle Position Sensor (TPS) is mounted on the throttle body and is connected to the throttle blade.
The TPS is a 3wire variable resistor that provides the Powertrain Control Module (PCM) with an input signal (voltage) that represents the throttle blade position of the throttle body. The sensor is connected to the throttle blade shaft. As the position of the throttle blade changes, the resistance (output voltage) of the TPS changes.
The PCM supplies approximately 5 volts to the TPS. The TPS output voltage (input signal to the PCM) represents the throttle blade position. The PCM receives an input signal voltage from the TPS. This will vary in an approximate range of from .26 volts at minimum throttle opening (idle), to 4.49 volts at wide-open throttle. Along with inputs from other sensors, the PCM uses the TPS input to determine current engine operating conditions. In response to engine operating conditions, the PCM will adjust fuel injector pulse width and ignition timing.
The PCM needs to identify the actions and position of the throttle blade at all times. This information is needed to assist in performing the following calculations:
Ignition timing advance Fuel injection pulse-width Idle (learned value or minimum TPS) Off-idle (0.06 volt) Wide Open Throttle (WOT) open loop (2.608 volts above learned idle voltage) Deceleration fuel lean out Fuel cutoff during cranking at WOT (2.608 volts above learned idle voltage) A/C WOT cutoff (certain automatic transmissions only)
Removal & Installation
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