Diagnostic Trouble Code (DTC) Information

DTC information
981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 998 8686 Replaced by 9511532 998 8686 Replaced By 9511532
Condition





System pressure solenoid STH controls system pressure in the transmission. The solenoid is controlled by an amplifier in the transmission control module (TCM) output. The transmission control module (TCM) uses the amplifier to control the current to the solenoid. A low amperage gives a high system pressure and a high amperage (approx. 1 A) gives a low system pressure. This amperage is primarily affected by throttle position. Diagnostic trouble code (DTC) AT-131 is posted if the transmission control module (TCM) registers an open-circuit or short-circuit to ground in the solenoid STH circuit so there is too little current passing through the circuit. Solenoid STH cannot control system pressure.

Substitute value
The transmission control module (TCM) "Emergency mode III" program is initiated.

Possible source
- Open-circuit in the control signal cable or signal cable.
- Short-circuit to ground in the control signal cable or signal cable.
- Short-circuit between control signal cable and signal cable
- Short-circuit to supply voltage in control signal cable
- Defective solenoid STH.
- Open-circuit in power ground
- Contact resistance in terminals
- Defective control module.

Fault symptom[s]
- The combined instrument panel warning lamp flashes.
- No lock-up function.
- No adaption of the gear slippage times at high altitude (High Altitude Compensation)
- No torque limiting request to engine control module (ECM) when shifting
- No system pressure solenoid STH control, this results in constant maximum system pressure and leads to harsher shifting and gear meshing.