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
Condition




The transmission control module (TCM) calculates the ratio between the transmission input speed and the vehicle speed. There is a specific ratio for each gear. Diagnostic trouble codes (DTCs) AT-321, AT-322, AT-323 or AT-324 are stored if the transmission control module (TCM) registers that the ratio deviates more than 10%, depending on the gear. Oil temperature must be above +20°C and the throttle opening must exceed 3 %.

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

Possible source
- Interference with or faulty transmission speed sensor signal.
- Interference with or faulty vehicle speed sensor (VSS) signal from transmission speed sensor
- Contact resistance in the Solenoid S1 and S2 circuits.
- Gear-shift position sensor incorrectly adjusted.
- Transmission oil level too low.
- Mechanical fault in the transmission. Worn components in the transmission causing slippage or low line pressure.
- Defective power ground.
- Short-circuit to ground in transmission speed sensor signal cable (-).

Fault symptom[s]
- The combined instrument panel warning lamp flashes.
- Mechanical malfunction. Faults are usually indicated by noise or other obvious function problems.
- 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 line pressure solenoid STH control, resulting in constant maximum line pressure. This leads to harsher shifting and gear meshing.
- No lock-up function.