P1767 (14) - Relay Output Always On

Name of Code:
P1767 (14) - Relay Always On

When Monitored:
When ignition key is turned from "off position to "run" position and/or ignition key is turned from "crank" position to "run" position.

Set Condition:
This code is set if the Transmission Control Module (TCM) senses greater than 3 volts at the Trans Control Relay Output terminal (s) of the TCM prior to the TCM energizing the relay.

Theory of Operation:
The transmission control relay is used to supply power to the solenoids and pressure switches when the transmission is in normal operating mode. The relay output is fed back to the TCM through pins 16, 17, and 36. It is referred to as "Transmission Control Relay Output". This circuit does not supply power to the TCM, it is only a sense circuit. When the relay is off, no power is supplied to the solenoids and pressure switches, and the transmission is in "limp-in" or "default" mode.

Transmission Effects:
The MIL will illuminate and the transmission system will default to the Immediate Shutdown routine.

Possible Causes:
- Transmission Control Relay contacts stuck together.
- Short to voltage in Transmission Control Relay output circuit (s).
- Short to voltage in Transmission Relay Control circuit.
- Short to voltage on any pressure switch sense circuit.
- Short to voltage on any solenoid control circuit.
- TCM connector problems.
- TCM.