Code 25

This 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 volts) the DTC25 is stored and the BACKUP MODE is set.

DIAGNOSTIC AIDS:
- This Diagnostic is an electrical test done by the TCM.
- Detection conditions:
- Ignition voltage measured between TCM terminal A7 or A8 and ground C1 is lower than specification.

Specification decreases with the transmission oil temperature:
-40°C (-40°F) = 8.7 volts
90°C (i94°F) = 9.0 volts
150°C (304°F) = 9.2 volts

- 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 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