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Old 02 Nov 2011, 05:16 am
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Default reading obdII in real time 1997 honda del sol?

can anybody point me in the direction of some good pinouts wiring diagrams etc for my 1997 honda del sol si. i am looking to try to make a lcd screen to be installed in the dash that shows all the possible realtime data so anything from how the guages signals are sent and their scales to wiring diagrams would help out. starting senior design early

Thanks for your time
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Old 02 Nov 2011, 05:31 am
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here's a link to a downloadable service manual for the civic. it should be the same as the del sol in terms of the OBD II inputs and outputs.

you are not going to find a table of values for the separate sensors to use to determine if the sensor inputs to the PCM are in range or out of range. I think you'll have to go to the diagnostics section on Fuel and Emissions and read through the individual test procedures to determine what those ranges are. I'm not aware of any manufacturer that publishes those values.

as a rule, your Electronic Coolant Temp Sensor is a negative coefficient thermistor

the Throttle Position sensor is a potentiometer (Variable resistor). both the thermistors and the variable resistors look at the difference between an input voltage of 5v and an output voltage after the resistance to determine the value to report to the PCM. As an example, closed throttle is reported at less than 0.5 volt from the TPS; Wide Open Throttle is reported at about 4.5v. resistance decreases with the opening of the throttle. the table of values is predicated on the Voltage Drop across the resistor, not by reading the actual voltage output by the sensor.

RPM is calculated off of the Crankshaft Position Sensor.

the Idle Air Control Valve is duty cycle pulse that reports percentage of on time

the O2 sensor is a signal generating sensor based on the difference between the oxygen in the outside air and the oxygen in the exaust gases. the range is usually 0.1v to 1.0v with the higher voltage indicating a greater difference (rich mixture).

Vehicle Speed Sensors, Transmission output speed sensors, crankshaft position sensors and ABS sensors are magnetic signal generating sensors based on the interruption of a magnetic field by a rotating cog.

the radiator fan temp sensor is an on-off switch using a thermistor to close the circuit when the temp threshold is reached.

hope that helps
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