How do I tell if the computer is bad?
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Junior Member
Joined: Nov 1999
Posts: 36
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From: South Riding, VA
How do I tell if the computer is bad?
I've got a 92 305tbi with a 700r4 transmission. The torquer converter is not engaging so I have no fourth gear. My mechanic checked the transmission and its good since the rebuild about 10 mos. He's leaning toward it having a bad computer or a bad ground. How do you test for these conditions? Thanks for your response
Supreme Member
Joined: Jul 1999
Posts: 1,335
Likes: 2
From: Tucson, AZ, USA
Car: '92 Z28; Dk Teal; Her Pkg
Engine: 305
Transmission: Richmond 6 Spd
Axle/Gears: Moser 9", Detroit Locker, 3.70
There is a connector that plugs into the transmission for 4th geat detect & TCC control. The purple wire should have 12 volts to it when the ignition is on & the brake is not depressed. The tan / black wire goes to the ECM. It grounds this wire to engage the TCC. This wire also goes to the ALDL connector, so you can manually ground it there & see if the TCC locks up. The light blue wire is grounded by the transmission when it is in 4th gear - it goes to the ECM, as an indicator.
Tim
Tim
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