On-Board Diagnostic System

The EATX controller continuously monitors critical transaxle input and output circuits within the system, verifying correct operation.

Also included are self-diagnostic functions which allow the testing of the electronic controls without requiring a road test.

The information available can aid in transaxle diagnosis.

^ Some circuits are tested continuously.

^ Others are checked only under certain circumstances.

Fault Messages

Each circuit monitored by the EATX controller has a corresponding fault message assigned to it. SEE Fault Code Descriptions for fault message to fault number conversion and descriptions of fault codes.

^ If the on-board diagnostic system senses that one of the circuits is malfunctioning, it stores the corresponding fault message in memory.

^ If the malfunction goes away after the fault is stored, the fault message will be erased after 75 key cycles.

Reset Counter

The reset counter counts the number of times the vehicle has been started since faults were last set, erased, or the battery was disconnected.

^ The reset counter will count up to 255 starts.


^ When there are no faults stored in memory, the DRBII will display "NO FAULTS DETECTED" and the reset counter will show "RESET COUNT = XXX".

Identifying Hard and Soft Faults

The number of starts helps determine whether a fault is hard or soft (intermittent).


^ If the reset counter reads less than 3, the fault is a hard fault.

^ If the reset counter reads 3 or more, the fault is an intermittent (soft) fault. This means that the engine has been started several times without the fault reoccurring.