What tests must the EEC certified technician perform first on an E4OD/AXODE transmission concern?

The EEC test: KOEO, KOER, record all codes, wiggle test, and a drive cycle test if possible, plus checks for add-on devices, wiring splices, abnormal tires or axle, fluid level/condition, and OASIS and TSBs.

Why must the electronic control system be diagnosed before transmission repairs?

Per the chart's cautions, servicing the transmission before diagnosing the electronic control system may cause service codes to be lost, and failing to record codes may result in a repeat repair because the cause(s) of the concern may not have been identified.

What happens if the EEC test returns pass codes (Code 111)?

The vehicle goes to a transmission technician for diagnosis and repair.

What happens after electronic repairs if the transmission symptom is gone?

The EEC test is repeated (the EEC certified technician will repair any new concerns found), then the shop foreman or service manager test drives the vehicle; if acceptable it is returned to the customer.

Who test drives the vehicle at the end of the repair process?

The shop foreman or service manager; if the drive is unacceptable, they return the vehicle to the appropriate place in the service process.

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Ford E4OD/AXODE Electronic Transmission Repair Process Flowchart - TSB 91-6-4

Electronic transmission repair process flowchart with EEC test steps and decision branches

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Step-by-step flowchart of the electronic transmission repair process showing EEC test steps and pass/fail decision branches.

AI caption July 2011 · Photo 164 of 224

This document is a flowchart (Figure 1) describing Ford's electronic transmission repair process for E4OD/AXODE and similar electronically controlled automatic transmissions. The process begins with the write-up for transmission repair and dispatch to an EEC certified technician, who must perform the EEC test (KOEO, KOER, record all codes, wiggle test, and drive cycle test if possible), check for add-on devices, wiring splices, abnormal tires or axle, check transmission fluid level and condition, and check OASIS and TSBs. Three cautions are stressed: write down all codes so they are not lost; diagnose the electronic control system BEFORE any transmission repairs, or service codes may be lost; and failure to perform self test and record service codes may result in a repeat repair. If codes are present, the EEC certified technician performs pinpoint tests, completes electronic repairs, and erases service codes. If pass codes (Code 111) are returned, or if the symptom remains after electronic repairs, a transmission technician performs diagnosis and repair. Afterward the EEC test is repeated, the shop foreman or service manager test drives the vehicle, and if acceptable it is returned to the customer. Readers learn the correct diagnostic order for electronic transmissions and why code retrieval must precede mechanical repair.

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Frequently asked questions

What tests must the EEC certified technician perform first on an E4OD/AXODE transmission concern?: The EEC test: KOEO, KOER, record all codes, wiggle test, and a drive cycle test if possible, plus checks for add-on devices, wiring splices, abnormal tires or axle, fluid level/condition, and OASIS and TSBs.
Why must the electronic control system be diagnosed before transmission repairs?: Per the chart's cautions, servicing the transmission before diagnosing the electronic control system may cause service codes to be lost, and failing to record codes may result in a repeat repair because the cause(s) of the concern may not have been identified.
What happens if the EEC test returns pass codes (Code 111)?: The vehicle goes to a transmission technician for diagnosis and repair.
What happens after electronic repairs if the transmission symptom is gone?: The EEC test is repeated (the EEC certified technician will repair any new concerns found), then the shop foreman or service manager test drives the vehicle; if acceptable it is returned to the customer.
Who test drives the vehicle at the end of the repair process?: The shop foreman or service manager; if the drive is unacceptable, they return the vehicle to the appropriate place in the service process.