Dodge Ram Truck 1500-2500-3500. Manual — part 318

DIAGNOSIS AND TESTING

PRE-DIAGNOSTIC CHECK OUT

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - DIAGNOSIS AND TESTING).

For a complete wiring diagram Refer to Section 8W.

Diagnostic Test

1.

PRE-DIAGNOSTIC CHECK OUT

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 scan tool, read the engine DTC’s. Check and repair all Engine DTC’s prior to performing Transmission
symptom diagnostics.

With the scan tool, 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 to ensure that all diagnostic monitors have
run.

NOTE: Verify flash level of Powertrain Controller. Some problems are corrected by software upgrades to the
Transmission and Engine Systems.

NOTE: Due to the integration of the Powertrain and Transmission control modules - if a controller flash is
performed it is necessary to perform Quick Learn and the Drive Learn procedures with the scan tool. Failure
to do so may result in shift quality complaints.

NOTE: Check for applicable Service Bulletins that may apply.

Were any repairs made that fixed the customer’s complaint?

Yes

>> Testing complete.

No

>> Refer to the diagnostic test procedure related to the DTC.

8E - 144

ELECTRONIC CONTROL MODULES - SERVICE INFORMATION

DR/DH

PRE-DIAGNOSTIC CHECKOUT (DIESEL)

For a complete wiring diagram Refer to Section 8W

1.

PRE-DIAGNOSTIC CHECKOUT

NOTE: Always perform diagnostics with a fully charged battery to avoid false symptoms.

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.
With the scan tool, read engine DTC’s. Check and repair all engine DTCs prior to performing transmission symptom
diagnostics.

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Repair as necessary.

Verify the flash level of the Engine Control Module. Some problems are corrected by software upgrades.

Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.

Did any of the above checks or procedures correct the symptom?

Yes

>> Refer to the Transmission category and perform the appropriate symptom(s). (Refer to 21 - TRANS-

MISSION/TRANSAXLE/AUTOMATIC - 48RE - DIAGNOSIS AND TESTING)

No

>> Repair is complete.

Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/
ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - DIAGNOSIS AND TEST-
ING)

DR/DH

ELECTRONIC CONTROL MODULES - SERVICE INFORMATION

8E - 145

TRANSMISSION VERIFICATION TEST VER - 1 (GAS)

1.

1. Inspect the vehicle to ensure that all engine and transmission components are properly installed and connected.
Reassemble and reconnect components as necessary.

2. If any existing diagnostic trouble codes have not been repaired, go to Symptom List and follow path specified.

3. Connect a scan tool to the data link connector.

4. Ensure the fuel tank has at least a quarter tank of fuel. Turn off all accessories.

5. Start and run the engine until the transmission temperature is above 43°C (110°F).

6. Check the transmission fluid level per the Service Information. Adjust if necessary.

7. Road test the vehicle. Make 15 to 20 1-2, 2-3 and 3-4 up shifts. Perform these shifts from a standing start to 72
km/h (45 MPH) with a constant throttle opening of 20-25%.

8. Below 40 km/h (25 MPH), make 5 to 8 wide open throttle kick downs to 1st gear. Allow at least 5 seconds each
in 2nd and 3rd between each kick down.

9. For a specific DTC, drive the vehicle in accordance with the Symptom’s When Monitored and Set Conditions to
verify the repair.

10. If a DTC sets during the road test, return to the Symptom List and follow the path. If no DTC sets, the repair is
complete.

Are there any DTCs or symptoms remaining?

Yes

>> Repair is not complete, refer to appropriate symptom.

No

>> Repair is complete.

8E - 146

ELECTRONIC CONTROL MODULES - SERVICE INFORMATION

DR/DH

TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL)

1.

1. Inspect the vehicle to ensure that all engine and transmission components are properly installed and connected.
Reassemble and reconnect components as necessary.

2. If any existing diagnostic trouble codes have not been repaired, go to Symptom List and follow path specified.

3. Connect a scan tool to the data link connector.

4. Ensure the fuel tank has at least a quarter tank of fuel. Turn off all accessories.

5. Start and run the engine until the transmission temperature is above 43°C (110°F).

6. Check the transmission fluid level per the Service Information. Adjust if necessary.

7. Road test the vehicle. Make 15 to 20 1-2, 2-3 and 3-4 up shifts. Perform these shifts from a standing start to 72
km/h (45 MPH) with a constant throttle opening of 20-25%.

8. Below 40 km/h (25 MPH), make 5 to 8 wide open throttle kick downs to 1st gear. Allow at least 5 seconds each
in 2nd and 3rd between each kick down.

9. For a specific DTC, drive the vehicle in accordance with the Symptom’s When Monitored and Set Conditions to
verify the repair.

10. If a DTC sets during the road test, return to the Symptom List and follow the path. If no DTC sets, the repair is
complete.

Are there any DTCs or symptoms remaining?

Yes

>> Repair is not complete, refer to appropriate symptom.

No

>> Repair is complete.

DR/DH

ELECTRONIC CONTROL MODULES - SERVICE INFORMATION

8E - 147