Chrysler Concorde 2004 Service Manual page 1293

Symptom:
P0891-TRANSMISSION RLY ALWAYS ON
When Monitored and Set Condition:
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 Transmis-
sion Control Modules, the transmission part of the PCM has its own specific power and
ground circuits.
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
TEST
1 NOTE: Low fluid level can be the cause of many transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIII , read Engine DTC's. Check and repair all Engine DTC's prior to
performing any transmission symptom diagnostics.
With the DRBIII , read Transmission DTC's. Record all DTC's and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test
for P0706 Check Shifter Signal.
For Gear Ratio DTC's, check and record all CVI's.
Most DTC's set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
NOTE: Verify flash level of Powertrain Control Module. Some problems are
corrected by software upgrades to the Transmission and Engine software.
NOTE: Check for applicable TSB's related to the problem.
Perform this procedure prior to Symptom diagnosis.
Continue
POSSIBLE CAUSES
ACTION
Go To 2
TRANSMISSION - NGC
133
APPLICABILITY
All