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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 603 (3.0L Diesel - DTCS P2455-00 To U1489-00 - 1500) >> Diagnosis And Testing >> U1121-00-Lost Communication With Lin Ecu 1 >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read DTCs.

      Does the scan tool display this DTC 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.
      • Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  2. CHECK FOR AN ACTIVE DTC WITH THE GLOW PLUG MODULE 
    1. Turn the ignition off.
    2. Disconnect the Glow Plug Module harness connector.
    3. Turn the ignition on.
    4. Wait 10 seconds.
    5. With the scan tool, read DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go To  3

      No 

      • Replace the Glow Plug Module in accordance with the service information.
      • Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  3. CHECK FOR AN ACTIVE DTC WITH THE ALTERNATOR 
    1. Turn the ignition off.
    2. Disconnect the Alternator harness connector.
    3. Turn the ignition on.
    4. Wait 10 seconds.
    5. With the scan tool, read DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go To  4

      No 

      • Replace the Alternator in accordance with the service information.
      • Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  4. CHECK THE (D509) LIN BUS CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the PCM C1 harness connector.
    3. Measure the resistance between the (D509) LIN Bus circuit and all other circuits on the PCM C1 harness connector at the PCM C1 harness connector.

      Is the resistance above 10k Ohms on all other circuits?

      Yes 

      • Repair the (D509) LIN Bus circuit for a short to the circuit that measured less than 10k Ohms.
      • Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE (D509) LIN BUS CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Disconnect the PCM C1 harness connector.
    2. Measure the resistance of the (D509) LIN Bus circuit between the Glow Plug Module harness connector and the PCM C1 harness connector. Also, measure the resistance of the (D509) LIN Bus circuit between the Alternator harness connector and the PCM C1 harness connector.

      Is the resistance (measured from either the Glow Plug Module or the Alternator to the PCM C1 connector) above 5.0 Ohms?

      Yes 

      • Repair the (D509) LIN Bus circuit for an open/high resistance.
      • Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK THE (D509) LIN BUS CIRCUIT FOR A SHORT TO GROUND 
    1. Measure the resistance between ground and the (D509) LIN Bus circuit.

      Is the resistance above 10k Ohms?

      Yes 

      • Replace the Powertrain Control Module (PCM) in accordance with the service information. Refer to REMOVAL .
      • Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .

      No 

      • Repair the short to ground in the (D509) LIN Bus circuit.
      • Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
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