What the normal resistance for the TPS?
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From: Scottsdale, AZ, us
What the normal resistance for the TPS?
I am getting a trouble code 7 on my 1995 Accord with F22B2, manual transmission. The connections are good. What is the normal resistance supposed to be across the terminals?
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Re: What the normal resistance for the TPS? (woodworkermd)
The Throttle Position Sensor (TPS) is a potentiometer (i.e., a variable resistor, which is used to divide voltage); to test the TPS operation, you will be measuring the voltage instead of resistance (e.g., ohms).
As the throttle position changes, the TPS varies the voltage signal to the ECU.
You may want to reset the ECU and drive it under normal operating conditions, and see if the CEL comes back with trouble code 7. (It may have been just an intermittant failure.)
If it does, then unplug the TPS connector. Using a voltmeter, check the reference voltage coming from the ECU via the electrical connector plug. Turn the ignition key ON (engine not running). Touch the positive probe to the yellow/blue terminal (+) and the negative probe to the green/blue terminal (-) on the connector plug. It should read approximately 5.0V. (Approximately in this case, means it can be close, does not have to be exact.)
Next, check the TPS signal voltage. Plug connector back on TPS. With the ignition key ON (engine not running), throttle fully closed, install the positive probe of the voltmeter to the red/black (+) wire and the negative probe to the green/blue (-). Some people just scrap a little of the insulation off the wire and touch the probe to the exposed wire. (You can also touch the negative probe of the voltmeter to good ground in the engine bay instead of the green/blue wire (-).) With the throttle fully closed, the TPS should read approximately 0.5V (usually 0.45 - 0.5V). Gradually open the throttle valve and observe a distinct change in voltage as the sensor travels from idle to full throttle. The voltage should increase smoothly to approximately 4.5V (usually 4.5 - 5.0V) at full open throttle. (Cover back the exposed wire with some electrical tape, if you scrapped part of the insulation off the wires.)
Use the Search feature, under testing TPS, with Archives selected to see other threads, so you get more comfortable.
As the throttle position changes, the TPS varies the voltage signal to the ECU.
You may want to reset the ECU and drive it under normal operating conditions, and see if the CEL comes back with trouble code 7. (It may have been just an intermittant failure.)
If it does, then unplug the TPS connector. Using a voltmeter, check the reference voltage coming from the ECU via the electrical connector plug. Turn the ignition key ON (engine not running). Touch the positive probe to the yellow/blue terminal (+) and the negative probe to the green/blue terminal (-) on the connector plug. It should read approximately 5.0V. (Approximately in this case, means it can be close, does not have to be exact.)
Next, check the TPS signal voltage. Plug connector back on TPS. With the ignition key ON (engine not running), throttle fully closed, install the positive probe of the voltmeter to the red/black (+) wire and the negative probe to the green/blue (-). Some people just scrap a little of the insulation off the wire and touch the probe to the exposed wire. (You can also touch the negative probe of the voltmeter to good ground in the engine bay instead of the green/blue wire (-).) With the throttle fully closed, the TPS should read approximately 0.5V (usually 0.45 - 0.5V). Gradually open the throttle valve and observe a distinct change in voltage as the sensor travels from idle to full throttle. The voltage should increase smoothly to approximately 4.5V (usually 4.5 - 5.0V) at full open throttle. (Cover back the exposed wire with some electrical tape, if you scrapped part of the insulation off the wires.)
Use the Search feature, under testing TPS, with Archives selected to see other threads, so you get more comfortable.
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