Trouble Code Conditions

Special Tools:
- 981 3190
- 998 8686





Trouble Code Conditions
- Together with solenoid S1 the S2 and S1 shifting solenoids control shifting. Solenoid S2 operates when it receives battery voltage from the transmission control module (TCM) and is activated in 2nd and 3rd gears. Diagnostic trouble code (DTC) AT-221 is stored if the transmission control module registers a short-circuit to ground in the solenoid S2 circuit when the solenoid should not be activated. Solenoid S2 cannot be activated.

Substitute value(s)
- The transmission control module limp-home program has been initiated.

Possible source(s)
- Short-circuit to ground in signal cable.
- Defective solenoid.

Fault symptom(s)
- The combined instrument panel warning lamp flashes.
- Deterioration in performance because the transmission control module prevents activation of the solenoids, this stops gear-shifting. The transmission only operates in 3rd gear in positions 3 and L, 4th gear in position D and reverse in position R. Shifting can only be carried out manually between 3rd, 4th, and reverse gears.
- No system pressure solenoid STH control resulting in constant maximum system pressure leading to harsher shifting and gear meshing.
- No lock-up function.

NOTE: The Motronic 4.4 engine control module (ECM) posts a diagnostic trouble code when the transmission sends a malfunction indicator lamp (MIL) request. Erase this diagnostic trouble code in the Motronic engine control module when the transmission fault has been repaired.

- Start fault-tracing. Short-Circuit To Ground