Torque Converter not Locking Up
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Junior User
Joined: Feb 2004
Posts: 59
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From: On a farm
Torque Converter not Locking Up
My 1988 Bronco II has the stock automatic overdrive transmission. The torque converter locked up as it should until I had ignition problems a couple of weeks ago. The ignition problem ended up being a bad wire in the wiring harness. I suspect my torque converter problem is a result from me unhooking all the connectors under the hood and cleaning the terminals but that is just a guess. Other than the non-lock up the transmission operates fine and the fluid level is correct.
I have a Chilton manual with wiring diagrams however I'm not sure which relay is for the torque converter (I can't see the wire colors without peeling back the oversleeve and I hate to cut into the wrong harness). There are three relays on the right fender, one green, one black, and one brown. My questions are as follows:
Which relay is for the torque converter?
What activates the relay? It appears that voltage is supplied from the computer to activate, is this correct? If so, is the voltage 12 volts?
If supplying 12 volts to the relay locks up the converter can I merely use a toggle switch to lock and unlock the converter?
Hope someone can help with this problem.
I have a Chilton manual with wiring diagrams however I'm not sure which relay is for the torque converter (I can't see the wire colors without peeling back the oversleeve and I hate to cut into the wrong harness). There are three relays on the right fender, one green, one black, and one brown. My questions are as follows:
Which relay is for the torque converter?
What activates the relay? It appears that voltage is supplied from the computer to activate, is this correct? If so, is the voltage 12 volts?
If supplying 12 volts to the relay locks up the converter can I merely use a toggle switch to lock and unlock the converter?
Hope someone can help with this problem.
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
Torque converter lockup is controlled by the EEC-IV computer. To review the wiring diagram, the TCC solenoid (located in the valve body of the transmission) should have a steady 12 V from the EEC relay (factory relay is brown, I believe). The computer then acts as a ground side switch for the relay. When the computer completes the circuit, the converter clutch should lock.
Basic steps for diagnosing a no converter clutch lockup:
1) Start by pulling codes from the computer. many faults in the EEC-IV system may prevent the computer from choosing to command the TCC lockup. Make sure the solenoid has a steady 12 V and that the wiring between the solenoid and the computer is intact.
2) Use output state EEC-IV test to see if the computer can command the lockup.
3) A driving test to see if the computer is choosing to command lockup.
Basic steps for diagnosing a no converter clutch lockup:
1) Start by pulling codes from the computer. many faults in the EEC-IV system may prevent the computer from choosing to command the TCC lockup. Make sure the solenoid has a steady 12 V and that the wiring between the solenoid and the computer is intact.
2) Use output state EEC-IV test to see if the computer can command the lockup.
3) A driving test to see if the computer is choosing to command lockup.
