Chrysler RG Voyager. Manual — part 1323
Symptom:
P1793-TRD LINK COMMUNICATION ERROR
When Monitored and Set Condition:
P1793-TRD LINK COMMUNICATION ERROR
When Monitored:
The Transmission Control Module (TCM) pulses the 12 volt TRD signal
from the Powertrain Control Module (PCM) to ground, during torque managed shifts with
the throttle angle above 54 degrees. The TRD system is also tested whenever the vehicle
is stopped and the engine speed is at idle.
Set Condition:
This DTC is set when the Transmission Control Module (TCM) sends two
subsequent torque reduction messages to the Powertrain Control Module (PCM) and does
not receive a confirmation from the PCM. Note: Due to the integration of the Powertrain
and Transmission Control Modules, bus communication between the modules is internal.
POSSIBLE CAUSES
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
NOTE: Due to the integration of the Engine and Transmission controllers
into one module, the TRD bus messages are sent over a internal bus circuit.
View repair.
All
Repair
Replace the Powertrain Control Module per the Service Informa-
tion. WITH THE DRBIII
t PERFORM QUICK LEARN AND
REPROGRAM PINION FACTOR.
Perform 40/41TE (NGC) TRANSMISSION VERIFICATION
TEST - VER 1.
293
TRANSMISSION - NGC
Symptom:
P1794-SPEED SENSOR GROUND ERROR
When Monitored and Set Condition:
P1794-SPEED SENSOR GROUND ERROR
When Monitored:
The transmission gear ratio is monitored continuously while the
transmission is in gear.
Set Condition:
After a PCM reset in neutral and Input/Output Ratio equals a ratio of 2.50
to 1.0 ± 50.0 RPM.
POSSIBLE CAUSES
SPEED SENSOR GROUND CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
INTERMITTENT WIRING AND CONNECTORS
TEST
ACTION
APPLICABILITY
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
t, read Engine DTC’s. Check and repair all Engine DTC’s prior to
performing any transmission symptom diagnostics.
With the DRBIII
t, 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.
All
Continue
294
TRANSMISSION - NGC
TEST
ACTION
APPLICABILITY
2
Turn the ignition off to the lock position.
Remove the Starter Relay.
CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO
RESPONSE, condition and disable the starter.
Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmis-
sion Adapter kit 8333-1A.
Ignition on, engine not running.
With the Transmission Simulator, set the
9Input/Output Speed9 switch to 9ON9 and
the rotary switch to the
93000/12509 position.
With the DRBIII
t, monitor the Input and Output Speed Sensor readings.
Does the Input Speed read 3000 RPM and the Output Speed read 1250 RPM, ± 50
RPM?
All
Yes
→ Go To 3
No
→ Go To 4
3
The conditions necessary to set the DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wires while checking for shorted and open circuits.
With the DRBIII
t, check the EATX EVENT DATA to help identify the conditions in
which the DTC was set.
Were there any problems found?
All
Yes
→ Repair as necessary.
Perform 40/41TE (NGC) TRANSMISSION VERIFICATION
TEST - VER 1.
No
→ Test Complete.
4
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Input and Output Speed Sensor harness connectors.
Note: Check connectors - Clean/repair as necessary.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the Speed Sensor Ground circuit from the appropriate
terminal of special tool #8815 to the Input and Output Speed Sensor harness
connectors.
Is the resistance above 5.0 ohms on either circuit?
All
Yes
→ Repair the Speed Sensor Ground circuit for an open.
Perform 40/41TE (NGC) TRANSMISSION VERIFICATION
TEST - VER 1.
No
→ Go To 5
5
Using the schematics as a guide, inspect the wiring and connectors. Repair as
necessary. Pay particular attention to all power and ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per the
Service Information. WITH THE DRBIII
t PERFORM QUICK
LEARN AND REPROGRAM PINION FACTOR.
Perform 40/41TE (NGC) TRANSMISSION VERIFICATION
TEST - VER 1.
295
TRANSMISSION - NGC
P1794-SPEED SENSOR GROUND ERROR —
Continued
Symptom:
P1797-MANUAL SHIFT OVERHEAT
When Monitored and Set Condition:
P1797-MANUAL SHIFT OVERHEAT
When Monitored:
Whenever the engine is running and transmission is in the AutoStick
t
mode.
Set Condition:
If the Engine Temperature exceeds 123° C or 255° F, or the Transmission
Temperature exceeds 135° C or 275° F while in AutoStick
t mode. Note: Aggressive driving
or driving in low for extended periods of time in AutoStick
t mode will set this DTC.
POSSIBLE CAUSES
MANUAL SHIFT OVERHEAT
TEST
ACTION
APPLICABILITY
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
t, read Engine DTC’s. Check and repair all Engine DTC’s prior to
performing any transmission symptom diagnostics.
With the DRBIII
t, 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.
All
Continue
296
TRANSMISSION - NGC
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