Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
NOTE:
This DTC sets when the Drivetrain Control Module (DTCM) detects a wide voltage fluctuation on the Mode Sensor Signal circuit. Perform a thorough inspection of all wiring and connectors between the sensor and the control module.
1. With the scan tool, read DTCM DTCs and record on the repair order.
2. Record the Environmental Data.
3. With the scan tool, erase DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. With the scan tool, read DTCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE VOLTAGE ON THE (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT
1. Turn the ignition off.
2. Disconnect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (K504) Drivetrain 5-volt Supply circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector.
  NOTE:
  Voltage should be approximately 5.0 volts and steady. Compare any slight fluctuations found to a known good circuit in order to verify voltmeter functionality.
  
  Is the voltage approximately 5.0 volts and steady?
  
  Yes
  - Go To 6
  No
  - Go To 3
CHECK THE (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT FOR AN INTERMITTENT SHORT TO VOLTAGE
1. Turn the ignition off
2. Disconnect the DTCM C1 harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (K504) Drivetrain 5-volt Supply circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector.
5. Monitor the voltmeter while performing a wiggle test on the wiring harness and connectors.
  Is any voltage detected on the circuit during the wiggle test?
  
  Yes
  - Repair the (K504) Drivetrain 5-volt Supply circuit for an intermittent short to voltage.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to TRANSFER CASE VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT FOR HIGH RESISTANCE
1. Measure the resistance of the (K504) Drivetrain 5-volt Supply circuit between the Transfer Case Shift Motor/Mode Sensor Assembly harness connector and the DTCM C1 harness connector.
2. Monitor the Ohmmeter while performing a wiggle test on the wiring harness and connectors.
  Did the resistance ever go above 3.0 Ohms during the wiggle test?
  
  Yes
  - Repair the (K504) Drivetrain 5-volt Supply circuit for an intermittent open circuit or high resistance.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to TRANSFER CASE VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT FOR AN INTERMITTENT SHORT TO GROUND
1. Measure the resistance between ground and the (K504) Drivetrain 5-volt Supply circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector.
2. Monitor the Ohmmeter while performing a wiggle test on the wiring harness and connectors.
  Does the resistance reading ever indicate continuity to ground during the wiggle test?
  
  Yes
  - Repair the (K504) Drivetrain 5-volt Supply circuit for an intermittent short to ground.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to TRANSFER CASE VERIFICATION TEST .
  No
  - Go To 7
REPLACE THE TRANSFER CASE SHIFT MOTOR/MODE SENSOR ASSEMBLY
1. Replace the Transfer Case Shift Motor/Mode Sensor Assembly in accordance with the Service Information.
2. With the scan tool, erase DTCs.
3. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
4. With the scan tool, read DTCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 7
  No
  - The new Transfer Case Shift Motor/Mode Sensor Assembly repaired the problem.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all DTCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all DTCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read DTCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the DTCM in accordance with the Service information. Refer to MODULE, DRIVETRAIN CONTROL (DTCM), REMOVAL .
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .