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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 960 (5.7L - DTCS P2107 To U1449 - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P2112-Electronic Throttle Control System - Unable To Open - Bank 1 >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. 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.
      NOTE:

      If the P2100 is intermittent, it is possible that the controller is overheating in extreme hot temperatures and this is considered a normal protection operation. No repair is necessary.

      NOTE:

      Low battery voltage can also cause excessive current draw, in very hot and very cold ambient temperatures. Make sure the battery can pass a load test before continuing.

    2. With the scan tool, read the active DTCs.
    3. Look closely at the temperatures at which this DTC set.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

  2. THROTTLE PLATE INSPECTION 
    1. Turn the ignition off.
    2. Remove the Air Cleaner Assembly from the Throttle Body. Refer to BODY, AIR CLEANER, REMOVAL, 5.7L .
    3. Check for any signs of a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick.

      Were any signs of foreign material or scoring of the throttle plate or bore found?

      Yes 

      • Remove the debris if possible or replace the Throttle Body Assembly. Refer to THROTTLE BODY, REMOVAL . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (K447) ETC MOTOR (+) CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Throttle Body harness connector.
    3. Disconnect the PCM C2 harness connector.
    4. Turn the ignition ON.
    5. Measure the voltage between ground and the (K447) ETC Motor (+) circuit at the Throttle Body harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (K447) ETC Positive circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (K448) ETC NEGATIVE CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Measure the voltage between ground and the (K448) ETC Negative circuit at the Throttle Body harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (K448) ETC Negative circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK FOR THE (K447) ETC MOTOR (+) CIRCUIT SHORTED TO THE (K448) ETC MOTOR (-) CIRCUIT 
    1. Turn the ignition off.
    2. Check for continuity between the (K124) ETC Motor (+) circuit and the (K448) ETC Motor (-) circuit at the Throttle Body harness connector.

      Is there continuity between the (K124) ETC Motor (+) circuit and the (K448) ETC Motor (-) circuit?

      Yes 

      • Repair the short to between the (K447) ETC Motor (+) circuit and the (K448) ETC Motor (-) circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK THE (K447) ETC POSITIVE CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    CAUTION:

    Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.

    1. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
    2. Measure the resistance of the (K447) ETC Positive circuit from the Throttle Body harness connector to the GPEC Adaptor.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (K447) ETC Positive circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK THE (K447) ETC MOTOR (+) CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (K447) ETC Motor (+) circuit at the Throttle Body harness connector.

      Is there continuity between ground and the (K447) ETC Motor (+) circuit?

      Yes 

      • Repair the (K447) ETC Motor (+) circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
  8. CHECK THE (K448) ETC NEGATIVE CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K448) ETC Negative circuit from the Throttle Body harness connector to the GPEC Adaptor.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  9

      No 

      • Repair the (K448) ETC Negative circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. CHECK THE (K448) ETC MOTOR (-) CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (K448) ETC Motor (-) circuit at the Throttle Body harness connector.

      Is there continuity between ground and the (K448) ETC Motor (-) circuit?

      Yes 

      • Repair the (K448) ETC Motor (-) circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  10
  10. ETC MOTOR 
    1. Connect the Throttle Body harness connector.
    2. Measure the resistance of the ETC Motor between the (K447) ETC Motor (+) circuit and the (K448) ETC Motor (-) circuit at the GPEC Adaptor.

      Is the resistance between 2.5 and 25 Ohms at closed throttle?

      Yes 

      • Go To  11

      No 

      • Replace the Throttle Body Assembly. Refer to THROTTLE BODY, REMOVAL . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  11. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors.
    4. Perform any Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

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