14 Relay Output Always ON

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Part 2 Of 2:

THEORY OF OPERATION:
The Transmission Control Relay is used to supply power to the solenoid pack when the transmission is in normal operating mode. When the relay is off, no power is supplied to the solenoid pack and the transmission is in "limp-in" mode. The relay output is fed back to the TCM through pins 16 and 17.

This code is set if the Transmission Control Module (TCM) senses greater than 3 volts at the Transmission Control Relay Output terminals of the TCM prior to the TCM energizing the relay.

LIMP-IN:
YES

WHEN MONITORED/SET CONDITIONS:
Ignition key is turned from "off" position to "run" position and/or ignition key is turned from "crank" position to "run" position. The following conditions must be met for a successful OBDII trip:
- The engine must run for more than two minutes
- The turbine speed must be greater than 600 RPM or the output speed must be greater than 400 RPM
- If the transmission is below normal operating temperature, all forward gears must be applied for 3.5 seconds each and the transmission must be in either "park" or "neutral" for 3.5 seconds.
- If the transmission is hot, all forward gears must be applied for 1.5 seconds each and the transmission must be in either "park" or "neutral" for 1.5 seconds.
- No MIL lamp trouble codes have occurred or recurred.

TRANSMISSION EFFECTS:
All model years and calibrations - Logical limp-in mode. The TCM will put the transmission in 2nd gear and not allow it to shift.

POSSIBLE CAUSES:
- Relay failure (welded contacts)
- Short to battery in Transmission Control Relay output circuit(s) (12-volt supply)
- Short to voltage in Trans Relay control circuit
- TCM connector problems
- Defective TCM