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I have an idea of not using ECT sensor

posted by  Daeng on  Sat Aug 31 09:14 CST 2002
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From the FAQ section
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According to Chilton's (you may choose to disregard this):
"The coolant temperature signal to the control unit has a great influence on the computed injection period... For example, when the engine is being started and is cold, the amount of injected fuel must be relatively large.
"If the control unit receives a signal higher than 302F (150C) or lower than -40F (-40C), it will interpret the signal as a fault...the control unit will assume a substitute value corresponding to 32F (0C) on starting and 68F (20C) when the engine has started.

"With the control unit connected, connect a voltmeter across LH ECU terminals 13 and 5 (ground), turn the ignition switch ON.

At 68F (20C) the voltage should be 2.0 +/-.5v volts.
At 104F(40C) the voltage should be 1.2 +/- .3volts
At 176F (80C) the voltage should be .5 +/- .2volts.
The resistance values between pins 13 and 5 or between pins on the sensor are (by eye from the chart):
32F (0C)-- about 6000 ohms within a range of +/- 10%
68F(20C) -- about 2300 ohms "
104F(40C) -- about 1300 ohms "
140F(60C) -- about 600 ohms "
176F(80C) -- about 300 ohms "
212F -- about 190 ohms "
[Response 2: Steve Ringlee] ECT resistance "cold" should be around 6k ohms at 32 degrees F (0 deg C), 2300 at 68 degrees F (20 C), and 200 at 212 F (100 C). However, try checking your ECT wiring: Between pins 13 and 5 at the LH ECU (with sensor DISconnected) resistance should be infinite. Voltage with the ignition ON and sensor connected, measured between pins 13 and 5, should be:
0 C=around 3 volts +/-.5v
20C=around 2 volts +/- .5v
100C=around .3 volt +/- .1v
If these aren't correct, check the connections in the ECT wiring harness. Check engine ground connections at the intake manifold. If the voltage is zero, your ECU is at fault
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Anyone could suggest me how to calculate the suitable range of variable resister to simulate the working resistance of ECT sensor..?


Daeng
Thailand

93-940 B230F 266,000 KM.






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New I have an idea of not using ECT sensor
posted by  Daeng  on Sat Aug 31 06:50 CST 2002 >


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