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
(F943) FUSED IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN OR SHORTED
(Z911) GROUND CIRCUIT OPEN
(D51) CAN C BUS(+) CIRCUIT OPEN AT SAS
(D52) CAN C BUS(-) CIRCUIT OPEN AT SAS
CLOCKSPRING

TEST FOR INTERMITTENT CONDITION
NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
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. With 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.
  
  Does the scan tool display a red "X" next to the sensor?
  
  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.
(F943) FUSED IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN OR SHORTED

Fig 1: Check Fused Ignition Run/Start Control Output Circuit For Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Clockspring C3 (SAS) harness connector.
3. Turn the ignition on.
4. Using a 12-volt test light connected to ground, check the (F943) Fused Ignition Run/Start Control Output circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3.
  No
  - Repair the open or short to ground in the (F943) Fused Ignition Run/Start Control Output circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(Z911) GROUND CIRCUIT OPEN

Fig 2: Checking Ground Circuit For Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Using a 12-volt test light connected to 12-volts, check the (Z911) ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4.
  No
  - Repair the open in the (Z911) ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(D52) CAN C BUS (+) CIRCUIT OPEN

Fig 3: Measuring Resistance Of CAN C Bus (+) Circuit Between The TIPM Harness Connector And Clockspring Connector
Courtesy of CHRYSLER LLC
1. Disconnect the TIPM C7 harness connector.
2. Measure the resistance of the (D52) CAN C Bus (+) circuit between the TIPM C7 harness connector and the Clockspring C3 (SAS) harness connector.
  Is resistance below 5.0 Ohms?
  
  Yes
  - Go To 5.
  No
  - Repair the open in the (D52) CAN C Bus (+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(D51) CAN C BUS (-) CIRCUIT OPEN

Fig 4: Measuring Resistance Of CAN C Bus (-) Circuit Between TIPM Harness Connector And Clockspring C3 Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (D51) CAN C Bus (-) circuit between the TIPM C7 harness connector and the Clockspring C3 (SAS) harness connector.
  Is resistance below 5.0 Ohms?
  
  Yes
  - Replace the Clockspring in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the open in the (D51) CAN C Bus (-) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .