Trouble Code Conditions

SPECIAL TOOLS
Test box tool No. 981 3190, or equivalent
Volvo scan tool No. 998 8686, or equivalent

CONDITION
Shift solenoids S2 and S1 operate in tandem to control gear-shifting. The solenoids are controlled by the amplifier in the Transmission Control Module (TCM). The TCM opens the amplifier to activate the solenoids sending a voltage through the circuit. Solenoid S2 is activated in reverse, 1st and 2nd gears. Diagnostic Trouble Code (DTC) AT-222 is posted if the TCM registers an open-circuit or short-circuit to supply voltage in the solenoid S2 circuit when the solenoid should not be activated.

DTC AT-222 is also posted if the control module registers a short-circuit in the solenoid S2 amplifier when it should not be activated, and the gear shift selector is in position D, 3, or L. Solenoid S2 cannot be activated or is activated constantly (depending on the fault).

SUBSTITUTE VALUE
The TCM limp-home program has been initiated.

POSSIBLE SOURCE
- Open-circuit in signal cable
- Short-circuit to supply voltage in the signal cable.
- Open-circuit in power ground
- Defective solenoid
- Contact resistance in terminals
- Fault in TCM

FAULT SYMPTOM(S)
- The combined instrument panel warning lamp flashes.
- Deterioration in performance because the TCM prevents activation of the solenoids, this stops gear-shifting. The transmission operates only 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 gear. If there is a short-circuit to supply voltage in the solenoid circuit the transmission will probably operate only in 1st gear.
- 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 DTC when the transmission sends a Malfunction Indicator Lamp (MIL) request.
- Erase this DTC in the Motronic ECM when the transmission fault has been repaired.

TESTING PROCEDURE
- Start fault-tracing at Fault In Solenoid Circuit. Fault In Solenoid Circuit