Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information
981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 998 8686 Replaced by 9511532 998 8686 Replaced By 9511532 999 2531 MANOMETER 999 2531 Manometer 999 5074 NIPPLE 999 5074 NIPPLE
Condition





Line pressure solenoid STH controls line 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 provides a high line pressure and a high amperage (approx. 1A) provides a low line pressure. This amperage is primarily affected by throttle position. Diagnostic trouble code (DTC) AT-123 is stored if the transmission control module (TCM) registers a short-circuit to battery voltage, causing too high an amperage in the solenoid STH circuit. Solenoid STH is unable to control the system pressure.

Substitute value
Transmission control module (TCM) "Limp home" program initiated.

Possible source
- Short-circuit to supply voltage in the signal cable.
- Defective solenoid STH.

Fault symptom[s]
- The combined instrument panel warning lamp flashes.
- Deterioration in performance because the transmission control module (TCM) 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 and 4th gear (D position), and reverse gear.
- No lock-up function.

Caution! There is a danger that this fault will cause line pressure in the transmission to be too low, which will result in wear.