Chrysler Town, Dodge Caravan. Manual — part 1065
TEST
ACTION
APPLICABILITY
6
Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Remove the Transmission Control Relay.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the Fused B+ circuit and the Transmission Control
Relay Output circuit in the Transmission Control Relay connector.
Using a 12-volt test light connected to ground, check the Transmission Control Relay
Output circuit in the Solenoid/Pressure Switch Assembly harness connector.
NOTE: The Test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?
All
Yes
→ Go To 7
No
→ Repair the Transmission Control Relay Output circuit for an
open. If the fuse is open make sure to check for a short to ground.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
7
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
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 L/R Pressure Switch Sense circuit from the Pinout Box
to the Transmission Solenoid/Pressure Switch Assembly harness connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the L/R Pressure Switch Sense circuit for an open.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
No
→ Go To 8
8
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
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 between ground and the L/R Pressure Switch Sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the L/R Pressure Switch Sense circuit for a short to
ground.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
No
→ Go To 9
296
TRANSMISSION - NGC
P1776-SOLENOID SWITCH VALVE LATCHED IN LR POSITION —
Continued
TEST
ACTION
APPLICABILITY
9
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Remove the Transmission Control Relay.
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.
Connect a jumper wire between the Fused B+ circuit and Transmission Control Relay
Output circuit.
Ignition on, engine not running.
Measure the voltage of the L/R Pressure Switch Sense circuit.
Is the voltage above 0.5 volt?
All
Yes
→ Repair the L/R Pressure Switch Sense circuit for a short to
voltage.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
No
→ Go To 10
10
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 the Powertrain Control Module per the Service Informa-
tion. WITH THE DRBIII
t PERFORM QUICK LEARN AND
REPROGRAM PINION FACTOR.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
11
The conditions necessary to set this DTC are not present at this time.
Test Drive and verify if the transmission is launching in 2nd gear and/or no TCC
engagement.
With the DRBIII
t, check the EATX EVENT DATA to help identify the conditions in
which the DTC was set.
Are there 2nd gear launches and/or no TCC engagement?
All
Yes
→ Disassemble and inspect the Valve Body per the Service Informa-
tion and repair or replace as necessary. If no problems are found
in the Valve Body, replace the Transmission Solenoid Pressure
Switch Assembly.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
No
→ Test Complete.
297
TRANSMISSION - NGC
P1776-SOLENOID SWITCH VALVE LATCHED IN LR POSITION —
Continued
Symptom:
P1790-FAULT IMMEDIATELY AFTER SHIFT
When Monitored and Set Condition:
P1790-FAULT IMMEDIATELY AFTER SHIFT
When Monitored:
After a speed ratio error is stored.
Set Condition:
This DTC is set if the associated speed ratio DTC is stored within 1.3
seconds after a shift.
POSSIBLE CAUSES
FAULT AFTER SHIFT
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
2
This test is set along with a gear ratio DTC. Perform the appropriate test for the Gear
Ratio DTC stored.
NOTE: Check 1 trip failures if there are no gear ratio DTCs current.
If there are no possible causes remaining, view repair.
All
Repair
Refer to the Transmission category and perform the appropriate
symptom.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
298
TRANSMISSION - NGC
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 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
299
TRANSMISSION - NGC
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