Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition




The transmission speed signal is transmitted by a sensor on the transmission. The transmission control module (TCM) uses the signal to determine the input shaft speed after the torque converter. This signal is used to compare the transmission speed with vehicle speed. The transmission control module (TCM) uses this comparison to calculate gear-shift timing. RPM and vehicle speed data affects the adjustment of system pressure, lock-up function control and engine torque- reduction. The result is smooth gear-shifting. Diagnostic trouble code (DTC) TCM-0089 is stored if the control module registers that the signal is too low when vehicle speed is over approximately 25 km/h (15.5 mph).

Substitute value
- The control module (TCM) "Emergency mode II" program is initiated.

Possible source
- Contact resistance in terminals.
- Short-circuit to ground in power supply.
- Short-circuit to ground in signal cable.
- Defective input speed sensor.

Fault symptom[s]
- General orange warning lamp lit.
- No lock-up function.
- Harsh gear shifting.

Hint: Harsh gear shifting can be caused by:
- No adaptation of the gear slippage times at high altitude (High Altitude Compensation).
- No reduction of line pressure when shifting.
- No reduction of line pressure when moving the gear selector between positions P-R, N-R and N-D.
- No torque limiting request to engine control module (ECM) when shifting.