Overview
The ZF 6073.023.069 TCU WG 94 EC3A is a critical electronic control unit (Transmission Control Unit) engineered specifically for the ZF WG 94 series. This OEM genuine part governs shift timing, clutch pressure modulation, and torque converter lock-up within the transmission assembly. Positioned directly on the valve body housing, the TCU interprets sensor data to ensure precise gear engagement under varying load conditions. The SKU 6073.023.069 is factory-calibrated for the WG 94 EC3A variant, making it a direct replacement for failed units. When servicing this component, technicians often inspect the adjacent 4661101046: HOUSING for cracks or warping, as the TCU mounts directly onto it.
Symptoms of Failure
- Erratic shift patterns or delayed engagement: A failing TCU may cause the transmission to hesitate before shifting or to skip gears entirely, particularly under heavy throttle.
- Torque converter shudder or lock-up failure: When the control unit loses signal integrity, the torque converter may fail to lock or unlock smoothly, producing a noticeable vibration at highway speeds.
- Intermittent limp mode activation: The system may default to a single gear (usually 2nd or 3rd) to protect the drivetrain, often accompanied by a check-engine light.
- Oil leaks near the valve body interface: While the TCU itself is sealed, a worn gasket or damaged 4661301125: HOUSING II can allow fluid to seep into the electrical connector, causing corrosion and erratic behavior.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 6073.023.069 |
| OEM Reference | WG 94 EC3A |
| Material | Die-cast aluminum housing with sealed electronics |
| Weight | 1.2 kg (2.65 lbs) |
| Dimensions (L x W x H) | 210 mm x 140 mm x 45 mm |
| Operating Voltage | 12V DC (24V compatible with adapter) |
| Connector Type | 24-pin rectangular (AMP compatible) |
Compatibility
This TCU is primarily designed for the ZF WG 94 series, including the WG94 EC3A variant. Based on the electronic architecture, it is also compatible with the ZF WG180 and WG200 transmissions that utilize the same valve body interface and solenoid resistance values. Always verify the transmission serial number before installation. The unit interfaces directly with the 0631306174: CYLINDRICAL PIN that aligns the control module to the housing, and the 0769123894: TYPE PLATE should be cross-referenced to confirm the exact calibration version.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101046 | HOUSING | Main structural carrier for the TCU and valve body |
| 4661301125 | HOUSING II | Secondary cover protecting the solenoid wiring harness |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise TCU mounting |
| 0769123894 | TYPE PLATE | Identification tag with calibration revision data |
| 0750100022 | SCREW PLUG | Seals the pressure test port on the valve body |
| 4660201008 | SCREW PLUG | Closes the main oil gallery access hole |
| 0636100117 | SCREW PLUG | Secures the accumulator piston bore |
| 0501211384 | VALVE | Modulates line pressure for clutch application |
| 0732042156 | COMPRESSION SPRING | Returns the shift valve to neutral position |
| 0768409154 | SCREW PLUG | Seals the torque converter regulator bore |
