Dodge Dakota (ND). Manual - part 961

U0121 LOST COMMUNICATION WITH ABS (CONTINUED)

For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - SCHE-
MATICS AND DIAGRAMS)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Every 7 msec with:
1) Engine speed greater than 500 RPM.
2) Battery voltage between 10 and 16 volts.

•

Set Condition:
CAN C bus messages are not received for 10 seconds.

Theory of Operation

The NGC controller communicates over the CAN C bus. The transmission controller continuously monitors bus
activity. The CAN C bus is also used to communicate transmission MIL status to the Engine Controller. If the Engine
Controller is unable to communicate with the Transmission Controller, a DTC will set and the Engine Controller will
illuminate the MIL.

Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic pro-
cedures and for further possible causes.

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AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS

U0141 LOST COMMUNICATION WITH FCM

AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS

21 - 237

U0141 LOST COMMUNICATION WITH FCM (CONTINUED)

For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - SCHE-
MATICS AND DIAGRAMS)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Every 7 msec with:
1) Engine speed greater than 500 RPM.
2) Battery voltage between 10 and 16 volts.

•

Set Condition:
CAN C bus messages are not received for 10 seconds.

Theory of Operation

Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic pro-
cedures and for further possible causes.

21 - 238

AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS

STANDARD PROCEDURE

42RLE TRANSMISSION VERIFICATION TEST - VER 1

1. After completion of the Transmission Verification Test, a Powertrain Verification Test must be performed. Refer to
the Powertrain Category.

2. Connect the scan tool to the Data Link Connector (DLC).

3. Reconnect any disconnected components.

4. With the scan tool, erase all Transmission DTCs, also erase the PCM DTCs.

5. Perform *PRNDL FAULT CLEARING PROCEDURE after completion of repairs for P0706 CHECK SHIFTER SIG-
NAL.

6. With the scan tool, display Transmission Temperature. Start and run the engine until the Transmission Temper-
ature is above 43° C (110° F).

7. Check the transmission fluid and adjust if necessary. Refer to the Service Information for the Fluid Fill procedure.

8. If the Powertrain Control Module or Torque Converter has been replaced, or if the Transmission has been
repaired or replaced, perform a Quick Learn Procedure and reset the Pinion Factor with the scan tool.

9. Road test the vehicle. With the scan tool, monitor the engine RPM. Make 15 to 20 1-2, 2-3, 3-4 upshifts. Perform
these shifts from a standing start to 45 M.p.h. 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 according to the DTC When Monitored and Set Conditions in order to verify
that the DTC is repaired.

12. If equipped with AutoStick

, upshift and downshift several times using the AutoStick

feature during the road

test.

13. Where applicable, use the EATX OBDII task manager to run Good Trip time in each gear. This will confirm the
repair.

14. Check for Diagnostic Trouble Codes (DTCs) after the road test. If a DTC sets during the road test , return to the
Symptom list and perform the appropriate diagnostic procedure.

15. Erase the Engine DTC P0700 to turn the MIL off after making transmission repairs.

Were there any DTCs set during the road test?

Yes

>> Refer to the Symptom List and perform the appropriate diagnostic procedure.

>> Repair is complete.

AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS

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