help with resistance values of transmission iss sensor and engine cmp sensor. TrailBlazer 5.3 l 2007

Mramses

Original poster
Member
Jul 19, 2020
322
17176352
hello friend, good evening, I am writing to you to please help me with some values of the cmp sensor and the iss sensor of the transmission. this for 2007 trailblazer with vortec 5.3l v8 engine.
What resistance value should I get between signal cmp and low reference? What resistance value should I get between iss signal and low ref. this in order to help me verify why there is no rpm count when I use the scanner on the cmp sensor. and also I don't register input rpm in the transmission iss sensor, additionally I don't have control amperage in the transmission pressure control solenoid. is it possible you can help me please.
reasons for which I request these data:
I have code p0340... I already checked the integrity of the wiring from the connector to the cmp sensor to the ecm harness in c2. I checked 12v the power supply of the sensor. when i check live engine data there is no cmp rpm and no cmp count. the resistance between pin c signal cmp and b low ref gives me greater than 1 Mohm, I request the data to verify that the sensor is faulty. Regarding the values of the iss sensor of the transmission, I request the data for the following reason with the intention of verifying if the sensor is good or defective:
when I check the transmission live data I have no input sensor rpm, there is no control amperage in the pressure control solenoid and even though the TCM commands to make changes as speed and rpm increase, it does not feel that the box engages with the speeds remains as in first speed.
How can I load the images of the data readings from the friend scanner?
thank you
 

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Mramses

Original poster
Member
Jul 19, 2020
322
17176352
good night friends. I was requesting the measurement of the transmission iss sensor to check the status of the sensor, as I had no response and the values that Mitchell on demand shows to compare did not matter to me, but I also saw in a video that GM did not give resistance to verify why it did not determine the actual state of the sensor. I bought a tcm from another truck and reprogrammed it with the tis2000. After testing, I already have an rpm reading from the iss sensor and also a modulation from the transmission pressure control solenoid. the samples now if you feel the box change and the road was also checked. now just top up the gearbox oil level and final test. I hope it will be useful to some of the group mates. important note: although in the live data of the transmission the tcm commanded and displayed the changes of 1-2-3-4, the box did not feel itself to change. It was in first, it also entered recoil. but it did not show the iss input rpm nor the modulation of the pc solenode. This was what caught my attention, I was thinking of lowering the box and disassembling the pump to check the iss sensor. but with the test of the other tcm I got the result I wanted. the original tcm is damaged and does not receive the signals from the iss. Regarding the p0340 code, I think that the resistance values of the sensor are very high, therefore it does not show pulses nor do I have an rpm reading from the sensor, I plan to change the sensor, measure the resistance first and try. I will be commenting on the results.
thanks friends
 

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