95 1/2 Model

This Diagnostic Trouble Code (DTC) flashes the "CHECK TRANS" Indicator and sets the Backup Mode.




Circuit Description:
The Ignition voltage of Transmission Control Module (TCM) Terminals A7 and A8 is monitored by the TCM and when the voltage is too low (approx. 9.0 volts) the DTC 25 is stored and the Backup Mode is set.

Diagnostic Aids:
- This diagnostic is an electrical test done by the TCM.

- Detection Conditions:
a. Ignition voltage measured between TCM Terminal A7 or AB and ground C1 is lower than specification. Specification decreases with the Transmission Oil temperature.
-40°C (-40°F) = 8.7 volts
90°C (194°F) = 9.0 volts
150°C (304°F) = 9.2 volts

b. The condition needs to be present for at least 1 second.

- Action After The Detection Time:
- Backup Mode.

- Recovery Conditions:
- To recover the Ignition voltage, voltage must be higher than specification. Specification decreases with the Transmission Oil temperature:
-40°C (-40°F) = 9.2 volts
90°C (194°F) = 9.5 volts
150°C (304°F) = 9.6 volts




DTC 25 / Flow Chart