4R70W NO 2-3 SHIFT
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4R70W NO 2-3 SHIFT
Hello
I need diagnostic help on my 2000 F150 4.6 4R70w trans. All trans operations work correctly once or twice a day. Then there is no 2-3 up shift. Manual downshift to 2 works all the time and will get me home.
Did an electrical diagnosis and found that the PCM wire that controlls the SS2 (shift solenoid 2) has 12 volts with key in the run position. It should only have voltage for the 2-3 shift.
Checked the SS1 and the voltage was correct for the 1-2 shift. Checked the resistance on the PCM harness wireing that had to do with the transmission and everythink was OK.
Replaced the PCM, with no change on trans operation.
Help.
RAYBURGH
I need diagnostic help on my 2000 F150 4.6 4R70w trans. All trans operations work correctly once or twice a day. Then there is no 2-3 up shift. Manual downshift to 2 works all the time and will get me home.
Did an electrical diagnosis and found that the PCM wire that controlls the SS2 (shift solenoid 2) has 12 volts with key in the run position. It should only have voltage for the 2-3 shift.
Checked the SS1 and the voltage was correct for the 1-2 shift. Checked the resistance on the PCM harness wireing that had to do with the transmission and everythink was OK.
Replaced the PCM, with no change on trans operation.
Help.
RAYBURGH
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Joined: Jan 2008
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From: Stockton Ca.
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JL
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