reset CHRYSLER VOYAGER 2001 Service Manual

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 TCM reset in neutral and Input/Output equals a ratio of input to
output of 2.50
POSSIBLE CAUSES
INTERMITTENT WIRING AND CONNECTORS
SPEED SENSOR GROUND CIRCUIT OPEN
TCM - SPEED SENSOR GROUND
TEST ACTION APPLICABILITY
1NOTE: 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 DRBIIIt, read the engine DTC's. Check and repair all engine DTC's prior
to performing Transmission Symptom Diagnostics.
With the DRBIIIt, 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 P0705 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 Transmission Control Module. Some problems
are corrected by software upgrades to the Transmission Control Module.
NOTE: Check for applicable TSB's related to the symptom.
Perform this procedure prior to Symptom diagnosis.All
Continue
Go To 2
2 Start the engine in park.
With the DRBIIIt, observe the Input and Output Speed Sensor readings.
Is the Output Speed Sensor reading twice the Input Speed Sensor reading?All
Ye s®Go To 4
No®Go To 3
133
TRANSMISSION

TEST ACTION APPLICABILITY
2 Turn the ignition off.
Remove the Transmission Oil Pan and Oil Filter per the Service Information.
Install a new Transmission Oil Filter per Service Information.
Reinstall Transmission Oil Pan, and refill with new Transmission Fluid per the
Service Information.
Note: The Transmission Cooler must be flushed before prodceeding.
Start the engine, check and adjust the Transmission Fluid Level per Service
Information.
Allow the engine to idle for 10 minutes, in Park.
Flush the Transmission Oil Cooler per the Service Information.
Turn the ignition off.
Drain and refill the Transmission Fluid.
Flush the Transmission Oil Cooler again.
Start the engine, check and adjust the Transmission Fluid Level per Service
Information.
With the DRBIIIt, perform a Battery Disconnect.
Note: This must be done to re enable EMCC during an A/C Clutch engage-
ment.
The vehicle may exhibit intermittent shudder during the first few hundred miles.
Note: The oil will gradually penetrate the TCC friction material and the
shudder should disappear.
Erase the DTC and return the vehicle to the customer.
Did the Code reset or does the vehicle still shudder after a few thousand miles?All
Ye s®Replace the Torque Convertor per the Service Information. Note:
After replacing the Torque Convertor, use the DRBIII to perform
the TCC Break In procedure. This will prevent possible shudder
conditions.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Test Complete.
141
TRANSMISSION
P1798-WORN OUT/BURNT TRANSAXLE FLUID ÐContinued

Verification Tests
41TE TRANSMISSION VERIFICATION TEST - VER 1 APPLICABILITY
1. Connect the DRBIIItto the Data Link Connector (DLC).
2. Reconnect any disconnected components.
3. With the DRBIIIt, erase all Transmission DTC's, also erase the PCM DTC's.
4. NOTE: Erase DTC P0700 in the PCM to turn the Malfunction Indicator Lamp (MIL)
off after making Transmission repairs.
5. With the DRBIIIt, display Transmission Temperature. Start and run the engine until the
Transmission Temperature is HOT - above 43.33É C or 110É F.
6. Check the Transmission Fluid and adjust if necessary. Refer to the Service information for
the Fluid Fill procedure.
7. NOTE: If the Transmission Control Module or Torque Converter has been replaced
or if the Transmission has been repaired or replaced it is necessary to perform the
DRBIIItQuick Learn Procedure and reset the(Pinion Factor(
8. NOTE: If the Torque Converter is replaced, or if a TCM is replaced on a vehicle
whose Torque Converter has less than 3750 miles and less than 360 minutes of
PEMCC, then with the DRBIIItrestart the TCC Break-In. This is in order to avoid
possible shudder.
9. Road test the vehicle. With the DRBIIIt, monitor the engine RPM. Make 15 to 20 1-2, 2-3,
3-4 upshifts. Perform these shifts from a standing start to 45 MPH with a constant throttle
opening of 20 to 25 degrees.
10. Below 25 MPH, make 5 to 8 wide open throttle kickdowns to 1st gear. Allow at least 5
seconds each in 2nd and 3rd gear between each kickdown.
11. For a specific DTC, drive the vehicle to the Symptom's When Monitored/When Set
conditions to verify the DTC repair.
12. NOTE: Use the EATX OBDII Task Manager to run Good Trip time in each gear, this
will confirm the repair and to ensure that the DTC has not re-matured.
13. Check for Diagnostic Trouble Codes (DTC's) during the road test. If a DTC sets during the
road test , return to the Symptom list and perform the appropriate Symptom.
Were there any Diagnostic Trouble Codes (DTCs) set during the road test?All
Ye s®Refer to the Symptom List for appropriate Symptom(s).
No®Repair is complete.
157
VERIFICATION TESTS

POWERTRAIN VERIFICATION TEST VER - 2 APPLICABILITY
1. NOTE: If the PCM has been replaced and the correct VIN and mileage have not
been programmed, a DTC will be set in the ABS Module, Airbag Module and the
SKIM.
2. NOTE: If the vehicle is equipped with a Sentry Key Immobilizer System, Secret
Key data must be updated. Refer to the Service Information for the PCM, SKIM and
the Transponder (ignition key) for programming information.
3. Inspect the vehicle to ensure that all components related to the repair are connected
properly.
4. With the DRBIIIt, clear DTCs and Reset Memory all engine values.
5. Run the engine for one warm-up cycle to verify proper operation.
6. Road test the vehicle. Use all accessories that may be related to this repair.
7. With the DRBIIIt, confirm that no DTC's or Secondary Indicators are present and that all
components are functioning properly.
8. If this test is being performed after a No Trouble Code test, verify the symptom is no longer
present.
9. If the symptom is still present, or any other symptom or DTC is present refer to the
appropriate category and perform the corresponding symptom.
10. Refer to any Technical Service Bulletins that may apply.
11. If there are no DTCs present and all components are functional properly, the repair is
complete.
Are any DTCs present?All
Ye s®Repair is not complete, refer to appropriate symptom.
No®Repair is complete.
158
VERIFICATION TESTS
Verification Tests ÐContinued