Vehicle Identity and Application Matching
AISIN · FWD 8AT · EAT8
AISIN EAT8: fluid, pressure, TCC, adaptation and misdiagnosis file
IDENTITYMove from EAT8 name to exact unit code
The same marketing name covers different vehicle calibrations.
- Record VIN, engine, transmission hardware/label code, production date and TCU software.
- Verify cooling, selector and software differences across Peugeot/Citroën/DS/Opel applications.
- Obtain fluid approval, fill quantity and level temperature only from vehicle service information.
- Note recent fluid exchange/flush, battery, engine or transmission programming.
MEASUREMENTConnect command, ratio, pressure and TCC
A harsh shift is not automatically a solenoid fault.
- Graph commanded/actual gear, input/output speed, ratio error and fluid temperature.
- Compare TCC command, slip speed and engine torque at steady speed and light load.
- Record pressure/solenoid commands, fill/adaptation values and shift time with OEM diagnostics.
- Read battery voltage, engine misfire/torque faults, mounts and cooling with transmission data.
DIFFERENTIALSeparate hydraulic, mechanical and external effects
Overhaul decisions follow live data.
- Cold/hot difference changes the likelihood of level, viscosity, valve body and internal leakage.
- A one-gear ratio fault is separated into clutch pack, solenoid/valve, speed sensor and mechanical elements.
- Separate TCC shudder from engine misfire, driveshaft/CV, mounts and tyre vibration by frequency/load.
- With selector/network faults verify power, CAN and selector state before removing the gearbox.
VALIDATIONComplete fluid, adaptation and road test by procedure
Blind adaptation reset destroys useful evidence.
- Set fluid level at the correct temperature, running state and plug sequence.
- Apply reset/relearn only when the repair and manufacturer prerequisites require it.
- Record cold take-off, low speed, controlled up/down shifts and hot TCC operation.
- Confirm pending ratio/pressure codes, leakage, temperature and shift quality.
FIELD WORKFLOWEvidence-preserving diagnostic sequence
- Confirm VIN/engine/unit code and TCU software.
- Capture full scan, fluid history and temperature conditions.
- Log gear/ratio/speeds/pressure/TCC and engine torque.
- Separate level, hydraulic, mechanical and external vibration causes.
- Apply OEM fluid/level and required adaptation procedure.
- Validate with cold/hot road test, pending and leak checks.
DIFFERENTIAL DECISION MATRIXConnect the symptom to evidence, not a guessed part
TECHNICAL SOURCESPrimary and official sources
- FWD 8-speed Automatic Transmission · AISIN Corporation
- EAT8 Developed with AISIN – Peugeot 308 · Stellantis Media
- Stellantis Service Box · Stellantis
- Manufacturer Communications and Vehicle Safety Records · NHTSA
This file is not a shortcut parts list. Exact numerical values are not published until vehicle identity, production period, control-unit software, test conditions and the manufacturer procedure are aligned.
DRIVELINE DIAGNOSTIC CRITERIA
Transmission code, hydraulic control and adaptation diagnosis
IDENTITYTorque-converter automatic
Vehicle identity, production date and full transmission code must be matched together.
- TCC slip, input/output speed and gear ratio
- Line pressure, solenoid current and fluid temperature
- Engine torque management and adaptations
LIVE DATAProve slip and pressure
Compare commanded and actual values at the same load and temperature.
- Commanded/actual gear, TCC state, ratio error and temperature
TRAPSPrevent wrong decisions before overhaul
- For harsh shifts, first eliminate engine torque faults, low voltage and incorrect fluid level.
Overview
Aisin EAT8 8-speed automatic is not one fluid capacity or one vehicle application; case, engine, ratio set, torque capacity, mechatronics and software variants must be separated.
Identity and Key Facts
- Record type
- transmission
- Verification
- Requires vehicle and system variant
- Service rule
- Fluid and level procedure from manufacturer data
Diagnostic sequence
- Do not reset adaptations blindly.
Post-repair verification
- Verify fluid level and leaks.
Transmission-family application research
This section connects a verified manufacturer relation to the model catalog; listed model families do not mean confirmed part/application fitment. Verify full code, build period, market and software identity.
No safe brand-to-model research link is available for this family; exact application has not been invented.
Continue to workshop technical center → · Maintenance and ownership decisions →
Transmission-family deep diagnostic matrix
A transmission-family name is not an exact application or calibration claim. Verify model, transmission code and TCM identity before using the measurement chain.
Use manufacturer service information and verified vehicle identity for exact OEM procedures, values and part applications.
6-step technical decision tree
- Verify identity
- Preserve first-event data
- Compare command and feedback
- Confirm with physical measurement
- Isolate root cause
- Retest under the same condition after repair
Source-verified powertrain relationships
No curated engine-transmission relationship is present in the source graph for this family yet. Exact fitment is not inferred.
Other names and search terms
Aisin EAT8 8-speed automatic
SERVICE DECISION LINKS
Connect this record to a real service decision
What should be verified when deepening this record?
Separate electronic command, pressure/hydraulics, clutch/converter, mechanical ratio and temperature effects. An adaptation value alone is not a parts diagnosis.
Transmission Atlas →
How to verify the technical identity
The same model name can carry different engines, transmissions, emissions packages and ECU software across years and markets. Verify VIN/chassis, engine code, production period and controller identity together before selecting parts or procedures. If an exact value is not supported, AutoAtlas does not fill the gap by guessing.
Engine families · Technical diagnostic atlas
Transmission research coverage
AISIN EAT8: fluid, pressure, TCC, adaptation and misdiagnosis file transmission code, application, shift quality, mechatronics, TCM, pressure, solenoid and ratio-fault research are connected to the same driveline identity.
Connect technical research to the next decision
Do not treat a family name as exact application; verify vehicle/model, code, market and controller identity before moving to maintenance or repair decisions.
Sources & freshness
Sources & freshness
Exact technical values, prices and failure rates are not invented without verified vehicle/manufacturer evidence.
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