Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, record and erase TIPM DTC's.
3. Cycle the ignition from on to off three times.
4. Turn the ignition on.
5. With the scan tool, read active TIPM DTC's.
  Does the scan tool display U0001-CAN C BUS as active?
  
  Yes
  - Go To 2.
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
ANTILOCK BRAKE MODULE - INTERNAL SHORT
1. Turn the ignition off.
2. Disconnect the Antilock Brake Module harness connector.
3. Turn the ignition on.
4. With the scan tool, record and erase TIPM DTC's.
5. Cycle the ignition from on to off three times.
6. Turn the ignition on.
7. With the scan tool, read active TIPM DTC's.
  Does the scan tool display U0001-CAN C BUS as active?
  
  Yes
  - Go To 3.
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the Antilock Brake Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
  - Perform the ABS VERIFICATION TEST. Refer to 1500, 2500 & 3500 - ABS VERIFICATION TEST or 3500 CAB & CHASSIS, 4500 & 5500 - ABS VERIFICATION TEST .
OCCUPANT RESTRAINT CONTROLLER MODULE - INTERNAL SHORT
WARNING:
Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Disconnect the Occupant Restraint Controller Module harness connectors.
2. Reconnect the 12-volt battery.
3. Turn the ignition on.
4. With the scan tool, record and erase TIPM DTC's.
5. Cycle the ignition from on to off three times.
6. Turn the ignition on.
7. With the scan tool, read active TIPM DTC's.
  Does the scan tool display U0001-CAN C BUS as active?
  
  Yes
  - Go To 4.
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Occupant Restraint Controller Module in accordance with the Service Information. Refer to CONTROLLER, OCCUPANT RESTRAINT, REMOVAL .
  - Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .
POWERTRAIN CONTROL MODULE - INTERNAL SHORT
1. Turn the ignition off.
2. Disconnect the PCM C1 or PCM C2 (6.7L) harness connector.
3. Turn the ignition on.
4. With the scan tool, record and erase TIPM DTC's.
5. Cycle the ignition from on to off three times.
6. Turn the ignition on.
7. With the scan tool, read active TIPM DTC's.
  Does the scan tool display U0001-CAN C BUS as active?
  
  Yes
  - Go To 5.
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the Powertrain Control Module in accordance with the Service Information. Refer to 3.7L, 4.7L & 5.7L - MODULE, POWERTRAIN CONTROL, REMOVAL or MODULE, POWERTRAIN CONTROL, 6.7L DIESEL [ETJ], REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 1500 & 2500 - 3.7L, 4.7L & 5.7L - POWERTRAIN VERIFICATION TEST or 2500 & 3500 - POWERTRAIN VERIFICATION TEST - 6.7L or 3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST or 3500 CAB & CHASSIS, 4500 & 5500 - POWERTRAIN VERIFICATION TEST - 6.7L .
STEERING ANGLE SENSOR - INTERNAL SHORT
1. Turn the ignition off.
2. Disconnect the Clockspring C3 (SAS) harness connector.
3. Turn the ignition on.
4. With the scan tool, record and erase TIPM DTC's.
5. Cycle the ignition from on to off three times.
6. Turn the ignition on.
7. With the scan tool, read active TIPM DTC's.
  Does the scan tool display U0001-CAN C BUS as active?
  
  Yes
  - Go To 6.
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Clockspring and program the SAS in accordance with the Service Information. Refer to CLOCKSPRING, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
WIRELESS IGNITION NODE - INTERNAL SHORT
1. Turn the ignition off.
2. Disconnect the Wireless Ignition Node harness connector.
3. Turn the ignition on.
4. With the scan tool, record and erase TIPM DTC's.
5. Cycle the ignition from on to off three times.
6. Turn the ignition on.
7. With the scan tool, read active TIPM DTC's.
  Does the scan tool display U0001-CAN C BUS as active?
  
  Yes
  - Go To 7.
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Wireless Ignition Node in accordance with the Service Information. Refer to RECEIVER, WIRELESS IGNITION NODE, REMOVAL .
  - Perform the WIRELESS IGNITION NODE (WIN) VERIFICATION TEST. Refer to WIRELESS IGNITION NODE (WIN) VERIFICATION .
DRIVETRAIN CONTROL MODULE - INTERNAL SHORT
1. Turn the ignition off.
  NOTE:
  If vehicle is not equipped with this module, answer yes to the question.
2. Disconnect the Drive Train Control Module C1 harness connector.
3. Turn the ignition on.
4. With the scan tool, record and erase TIPM DTC's.
5. Cycle the ignition from on to off three times.
6. Turn the ignition on.
7. With the scan tool, read active TIPM DTC's.
  Does the scan tool display U0001-CAN C BUS as active?
  
  Yes
  - Go To 8.
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Drivetrain Control Module in accordance with the Service Information. Refer to MODULE, DRIVETRAIN CONTROL, REMOVAL .
  - Perform the DTCM VERIFICATION TEST. Refer to 1500, 2500& 3500 - DTCM VERIFICATION TEST or 3500 CAB & CHASSIS, 4500 & 5500 - DTCM VERIFICATION TEST .
FINAL DRIVE CONTROL MODULE (FDCM) - INTERNAL SHORT
1. Turn the ignition off.
  NOTE:
  If vehicle is not equipped with this module, answer yes to the question.
2. Disconnect the FDCM harness connector.
3. Turn the ignition on.
4. With the scan tool, record and erase TIPM DTC's.
5. Cycle the ignition from on to off three times.
6. Turn the ignition on.
7. With the scan tool, read active TIPM DTC's.
  Does the scan tool display U0001-CAN C BUS as active?
  
  Yes
  - Go To 9.
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the FDCM in accordance with the Service Information. Refer to ACTUATOR, STABILIZER BAR, REMOVAL .
  - Perform the FDCM VERIFICATION TEST. Refer to FDCM VERIFICATION TEST .
INTEGRATED TRAILER BRAKE MODULE (ITBM) - INTERNAL SHORT
1. Turn the ignition off.
  NOTE:
  If vehicle is not equipped with this module, answer yes to the question.
2. Disconnect the ITBM harness connector.
3. Turn the ignition on.
4. With the scan tool, record and erase TIPM DTC's.
5. Cycle the ignition from on to off three times.
6. Turn the ignition on.
7. With the scan tool, read active TIPM DTC's.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 10.
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the ITBM in accordance with the Service Information. Refer to MODULE, INTEGRATED TRAILER BRAKE (ITBM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
TIRE PRESSURE MONITORING MODULE - INTERNAL SHORT
1. Turn the ignition off.
  NOTE:
  If vehicle is not equipped with this module, answer yes to the question.
2. Disconnect the Tire Pressure Module harness connector.
3. Turn the ignition on.
4. With the scan tool, record and erase TIPM DTC's.
5. Cycle the ignition from on to off three times.
6. Turn the ignition on.
7. With the scan tool, read active TIPM DTC's.
  Does the scan tool display U0001-CAN C BUS as active?
  
  Yes
  - Go To 11.
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Tire Pressure Monitoring Module in accordance with the Service Information. Refer to MODULE, TIRE PRESSURE MONITORING (TPM), REMOVAL .
  - Perform the TPM VERIFICATION. Refer to TPM VERIFICATION TEST .
TRANSMISSION CONTROL MODULE (TCM) - INTERNAL SHORT
1. Turn the ignition off.
  NOTE:
  If vehicle is not equipped with this module, answer yes to the question.
2. Disconnect the TCM C2 harness connector.
3. Turn the ignition on.
4. With the scan tool, record and erase TIPM DTC's.
5. Cycle the ignition from on to off three times.
6. Turn the ignition on.
7. With the scan tool, read active TIPM DTC's.
  Does the scan tool display U0001-CAN C BUS as active?
  
  Yes
  - Go To 12.
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Transmission Control Module in accordance with the Service Information. Refer to MODULE, TRANSMISSION CONTROL, DESCRIPTION .
  - Perform the TCM VERIFICATION TEST. Refer to AS68RC TRANSMISSION VERIFICATION TEST .
(D51) OR (D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking Can C Bus (-) Circuit For A Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the TIPM C7 and C1 harness connectors.
3. Turn the ignition on.
4. Measure the voltage between the (D51) CAN C Bus (-) circuit and ground at the TIPM C7 harness connector.
5. Measure the voltage between the (D64) CAN C Bus (-) circuit and ground at the TIPM C1 harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (D51) or the (D64) CAN C Bus (-) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 13.
(D52) OR (D65) CAN C BUS (+) CIRCUIT SHORTED TO GROUND

Fig 2: Checking Can C Bus (+) Circuit For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Measure the resistance between ground and the (D52) CAN C Bus (+) circuit.
3. Measure the resistance between ground and the (D65) CAN C Bus (+) circuit.
  Is any resistance present?
  
  Yes
  - Repair the short to ground in the (D52) or (D65) CAN C Bus (+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 14.
CAN C BUS (+) CIRCUIT SHORTED TO CAN C BUS (-) CIRCUIT

Fig 3: Checking Can C Bus (+) Circuit For A Short To Can C Bus (-) Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (D52) CAN C Bus (+) circuit and the (D51) CAN C Bus (-) circuit.
2. Measure the resistance between the (D65) CAN C Bus (+) circuit and the (D64) CAN C Bus (-) circuit.
  Is any resistance present?
  
  Yes
  - Repair the short between the CAN C Bus (+) circuit and the CAN C Bus (-) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Totally Integrated Power Module in accordance with the Service Information. Refer to MODULE, TOTALLY INTEGRATED POWER (TIPM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .