P0891
Symptom List:P0883-TCM POWER INPUT HIGH
P0891-TRANSMISSION RLY ALWAYS ON
Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be P0883-TCM POWER INPUT HIGH.
When Monitored and Set Condition:
When Monitored: When the ignition is turned from the "off" position to the "run" position and/or the ignition is turned from the "crank" position to the "run" position.
Set Condition: This DTC set if the Transmission Control Module (TCM) senses greater than 3 volts at the Transmission Control Relay Output circuits at the TCM prior to the TCM energizing the relay. Note: Due to the integration of the Powertrain and Transmission Control Modules, the transmission part of the PCM has its own specific power and ground circuits.
P0891-TRANSMISSION RLY ALWAYS ON
When Monitored: When the ignition is turned from the "off" position to the "run" position and/or the ignition is turned from the "crank" position to the "run" position.
Set Condition: This DTC set if the Transmission Control Module (TCM) senses greater than 3 volts at the Transmission Control Relay Output circuits at the TCM prior to the TCM energizing the relay. Note: Due to the integration of the Powertrain and Transmission Control Modules, the transmission part of the PCM has its own specific power and ground circuits.
POSSIBLE CAUSES
- TRANSMISSION CONTROL RELAY STUCK CLOSED
- TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO VOLTAGE
- TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT SHORT TO VOLTAGE
- POWERTRAIN CONTROL MODULE
- INTERMITTENT WIRING AND CONNECTORS
