Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

Possible Causes
(A104) FUSED B(+) CIRCUIT OPEN OR SHORTED
(Z908) GROUND CIRCUIT OPEN
(F946) FUSED IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN OR SHORTED
(D65) CAN C BUS (+) CIRCUIT OPEN
(D64) CAN C BUS (-) CIRCUIT OPEN
DRIVETRAIN CONTROL MODULE

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
  NOTE:
  Make sure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
2. Using the scan tool, select ECU view.
  NOTE:
  A red "X" will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.
  
  NOTE:
  Check the TIPM for any active CAN C hardware DTCs, perform DTC before proceeding.
  
  Does the scan tool display a red "X" next to the module?
  
  Yes
  - Go To 2.
  No
  - The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched and partially broken wires and the wiring harness connectors for broken, bent, pushed out and corroded terminals.
(A104) FUSED B(+) CIRCUIT OPEN OR SHORTED

Fig 1: Using 12-volt Test Light Connected To Ground To Check Fused B(+) Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Drivetrain Control Module C1 and C2 harness connectors.
3. Using a 12-volt test light connected to ground, check the (A104) Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3.
  No
  - Repair the (A104) Fused B(+) circuit for an open or short.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
(Z908) GROUND CIRCUIT OPEN

Fig 2: Using 12-volt Test Light Connected To 12-volts To Check Ground Circuit
Courtesy of CHRYSLER LLC
1. Using a 12-volt test light connected to 12-volts, check the (Z908) Ground circuit.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go To 4.
  No
  - Repair the (Z908) ground circuit for an open.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
(F946) FUSED IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN OR SHORTED

Fig 3: Using 12-volt Test Light Connected To Ground To Check Fused Ignition Run/Start Control Output Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (F946) Fused Ignition Run/Start Control Output circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5.
  No
  - Repair the (F946) Fused Ignition Run/Start Control Output circuit for an open or short.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
(D65) CAN C BUS (+) CIRCUIT OPEN

Fig 4: Measuring Resistance Of CAN C Bus (+) Circuit Between TIPM Connector And DTCM Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the TIPM C1 harness connector.
3. Measure the resistance of the (D65) CAN C Bus (+) circuit between the TIPM C1 connector and the DTCM C1 connector.
  Is resistance below 5.0 Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the (D65) CAN C Bus (+) circuit for an open.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
(D64) CAN C BUS (-) CIRCUIT OPEN

Fig 5: Measuring Resistance Of CAN C Bus (-) Circuit Between TIPM Connector And DTCM Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (D64) CAN C Bus (-) circuit between the TIPM C1 connector and the DTCM C1 connector.
  Is resistance below 5.0 Ohms?
  
  Yes
  - Replace the Drivetrain Control Module in accordance with the Service Information.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
  No
  - Repair the (D64) CAN C Bus (-) circuit for an open.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .