toyota corolla 2000 4cyl; automatic; no start; no crank; no prime fuel pump
- andrameda271
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After checking the cam sensor, back probing its 2 wires, a white and black, on Toyota corolla 2000, reading .o1 volts on both wires, unplugged, it pulled down to 00 on both wires. plugged it back with key off, then on again same reading .01 on both no 5 volt reference. cam is back probed and plugged in, unplugged crank no change; unplugged throttle sensor no change; unplugged mass air flow no change. IAc sensor was unplugged 4.95 ref. and mass air flow sensor.
Test light was placed on battery pos, the test light lit on the white wire camshaft sensor it was the ground wire ; on blk wire it did not light up this maybe my ref wire; did i short out my ref wire with test light to positive when I tapped it?. It used to crank; now there is no crank, after tapping blk wire, its a no start.
crank sensor, blk wire reads .05v mili volts it did not read 5.0v ref; red wire read 7.5 v its very confusing to me; is my blk wire the ref 5.voltage or my grd? if red wire is my grd then its reading high, not .100 milli volts' if red wire is my ref why is it reading 7.5 volts? Is red wire the ground?
Respectfully,
AG
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After checking the cam sensor back probing its 2 wires, a white and black, on Toyota corolla 2000, reading .o1 volts on both wires, when it was unplugged it pulled down to 00 nothing happened when unplugging crank, tps and mass air flow sensor.
You're mistaking the cam sensor as using a 5V ref, it does not. I am looking at wiring diagram and it's drawn as a solenoid with both wires going to PCM. It must be a VRS sensor, meaning it makes it's own voltage when the cam gear is moving. The same for the crank sensor.
The 5V ref wire is yellow. Do you have 5V ref at the TPS?
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- andrameda271
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After checking the cam sensor, back probing its 2 wires, a white and black, on Toyota corolla 2000, reading .o1 volts on both wires, unplugged, it pulled down to 00 on both wires. plugged it back with key off, then on again same reading .01 on both no 5 volt reference. cam is back probed and plugged in, unplugged crank no change; unplugged throttle sensor no change; unplugged mass air flow no change. IAc sensor was unplugged 4.95 ref. and mass air flow sensor.
Test light was placed on battery pos, the test light lit on the white wire camshaft sensor it was the ground wire ; on blk wire it did not light up this maybe my ref wire; did i short out my ref wire with test light to positive when I tapped it?. It used to crank; now there is no crank, after tapping blk wire, its a no start.
crank sensor, blk wire reads .05v mili volts it did not read 5.0v ref; red wire read 7.5 v its very confusing to me; is my blk wire the ref 5.voltage or my grd? if red wire is my grd then its reading high, not .100 milli volts' if red wire is my ref why is it reading 7.5 volts? Is red wire the ground?
Respectfully,
AG
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- andrameda271
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i did not back probe the tps. After tapping the cam wires with test light thinking of bypass it stopped cranking i may have damage computer hope not. I really appreciate your observations.
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- juergen.scholl
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On this car the operating of the starter is not related to the ckp signal... if the starter does not spin then you have another issue.
Do you have 5 volts reference at the sensors, does the pcm comunĂcate?
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- andrameda271
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- andrameda271
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