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4l60e no 1st or 4th after rebuild

S

ssumners

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Michigan
I am trying to verify the electrical is working correctly on this 94 Chevy K1500 before putting this 4l60E back together again after my recent rebuild. I pulled the trans pan cover to inspect the solenoids since the truck had no 1st or 4th gear. With the truck ignition in run I took a solenoid I know works and plugged it into the 2-3 shift connector and the solenoid energizes (I hear a click). I take the same solenoid and attach it to the 1-2 shift and nothing happens. Both 1-2 and 2-3 leads show 12 V on the voltmeter. The wiring harness in the trans is new(it isn't installed but just plugged into the vehicle harness connector. The 15A trans fuse is good under the steering column. All resistances of the electrical were verified against the GM published ranges.
2 different local shops had taken a look at the truck and they said there were no codes. Any help finishing this would be appreciated.
 
NVW said:
1-2 and 2-3 are different solenoids with different wire connectors.
Click to expand...

The 1-2 and 2-3 shift solonoids are 1 in the same I believe in teh 4L60E trans. Check the resistance at the ECM plug for the 2 solonoids and see if tehy are within spec. I know that the wiring harness where it passes over the trans can give trouble, but ECM's do fail in them as well and cause trans issues.
 
You're right, I looked it up on the website I got parts for my 4l80e.
THEFERMANATOR said:
The 1-2 and 2-3 shift solonoids are 1 in the same I believe in teh 4L60E trans. Check the resistance at the ECM plug for the 2 solonoids and see if tehy are within spec. I know that the wiring harness where it passes over the trans can give trouble, but ECM's do fail in them as well and cause trans issues.
Click to expand...
 
Did you measure the 12v between the 2 plugin wires or just the hot one to ground against the tranny or so?
you may want to check the main tranny trough connector if the pins make good contact.
 
4l60 E Measured resistances

With the truck ignition in "run" I measured the resistance at the vehicle harness connector and across the 1-2, 2-3 solenoid connection points in the transmission(harness). If there is too little resistance at the vehicle harness 5.15 K ohms could this cause problems. I'm not sure what the normal range is.

4l60e_VehicleHarness_Resist-bmp.jpg4l60e_WiringHarnessV_Resist-bmp.jpg
 
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