Code 47/633 in E4OD/4R100 - Transmission Digest

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Code 47/633 in E4OD/4R100

Many technicians are familiar with the problem of early shift scheduling on the 4L80-E transmission. This prob¬lem is caused by a 4x4 low range signal being sent to the computer at an inappropriate time. Vehicles equipped with the E4OD/4R100 transmission may also have this type of problem. A code 47/633 is usually your first clue in identifying this condition. Since Ford uses the same wiring harness in both 4-wheel drive and 2-wheel drive vehicles, you may find code 47/633 in both types of vehicles.

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By Ed Lee
Ed Lee is a recently retired Sonnax technical specialist who writes on issues of interest to torque converter rebuilders and member of the Sonnax TASC Force (Technical Automotive Specialties Committee), a group of recognized industry technical specialists, transmission rebuilders and Sonnax Industries Inc. technicians.
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Code 47/633 in E4OD/4R100 TASC Force Tips Author: Ed Lee, Deltrans You May See This 4x4 Code on a 2-Wheel Drive Vehicle

TASC Force Tips

  • Author: Ed Lee, Deltrans

You May See This 4×4 Code on a 2-Wheel Drive Vehicle

Many technicians are familiar with the problem of early shift scheduling on the 4L80-E transmission. This prob¬lem is caused by a 4×4 low range signal being sent to the computer at an inappropriate time. Vehicles equipped with the E4OD/4R100 transmission may also have this type of problem. A code 47/633 is usually your first clue in identifying this condition. Since Ford uses the same wiring harness in both 4-wheel drive and 2-wheel drive vehicles, you may find code 47/633 in both types of vehicles.

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Along with the 4×4 wiring harness, you will find some other 4×4-related components in 2-wheel drive vehicles (i.e. 4×4 dash indicator light, low range indicator light and the associated, printed circuit panel).

The trouble tree for code 47/633 says that if the low range switch has failed in the ‘on’ position, then you will have early shift scheduling in the 2-wheel and 4-wheel high ranges. If the low range switch has failed in the off position, you will have late shift scheduling in the 4×4 low range position. Both of these statements make good sense and seem to be sound advice.

The next statement in the trouble tree says that if the fuse is blown in the circuit that feeds the low range switch, then you will have early shift scheduling. Since the low range switch is fed directly off of the ignition switch, and remov¬ing all of the fuses from the fuse panel will not affect the low range signal to the computer, troubleshooting in this area is a waste of time.

The wire that carries the low range signal to the computer is light blue with a black tracer. This wire has many opportunities to short with other wires. However, do not overlook the possibility of a problem in an area other than the light blue/black wire. The feed for the low range switch comes through the gang plug, at the back of the dash and to the right of the steering column (at the back of the tachometer on some models). From the gang plug the circuit travels down the printed circuit to the low range switch. A loose connection in this area may cause an early shift schedule condition. You may also notice some fluctuation in either the tachometer or fuel gauge. Hope this has given some insight into early shift scheduling and 4-wheel drive error codes found in 2-wheel drive vehicles.

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