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 and the vehicle speed. The transmission control module (TCM) uses this comparison to calculate the gear-shift timing. Engine speed (RPM) and vehicle speed data affects the adjustment of the system pressure, lock-up function control and engine torque reduction. The result is smooth gear-shifting. The control module calculates and compares the transmission speed, the engine speed (RPM) and the speed at the transmission. Diagnostic trouble code (DTC) TCM-0024 is stored if the control module registers that the signal is faulty when vehicle speed is above approximately 25 km/h.

Substitute value
- No torque reduction
- No lock-up.

Possible source
- Contact resistance in the terminals
- Open-circuit, short-circuit to ground or short-circuit to supply voltage in the power supply
- Open-circuit, short-circuit to ground or short-circuit to supply voltage in the signal cable
- Defective transmission input speed sensor
- Incorrect transmission installed if the transmission has been replaced.

Fault symptom[s]
- General orange warning lamp lit
- Malfunction indicator lamp (MIL) lit
- No lock-up function
- Harsh gear shifting.

Hint: Harsh gear shifting can be caused by:
- No reduction of the line pressure when shifting
- No reduction of line pressure when moving the gear selector between positions P-R, N-R and N-D
- No request for torque limiting to the engine control module (ECM) when shifting.