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 the gear-shift timing. Engine speed 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. Diagnostic trouble code (DTC) TCM-0087 is stored if the control module registers, when comparing with the transmission speed signal, that the engine speed (RPM) signal is too high when the vehicle speed is above approximately 25 km/h.

Substitute value
- The transmission control module (TCM) "Emergency mode I" program has been initiated.

Possible source
- Power supply (-) short-circuited to supply voltage.
- Defective engine speed (RPM) 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 reduction of the line pressure when shifting.
- No reduction of the 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.