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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 428 (5.7L - DTCS P2317 To U148C - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P2681-Engine Coolant Bypass Valve Control Circuit Open >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. DTC IS ACTIVE 
    1. Ignition on, engine not running.
    2. With the scan tool, navigate to System Test and select the Coolant Three Way Valve Test.

      Did the Coolant Valve Three Way Valve Test pass or fail?

      Fail 

      • Go To  2

      Pass 

  2. CHECK THE (K501) COOLANT THREE WAY VALVE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the Coolant Three Way Valve harness connector.
    3. Disconnect the Powertrain Control Module (PCM) C1 harness connector.
    4. Measure the resistance of the (K501) Coolant Three Way Valve Control circuit between the Coolant Valve Three Way Valve harness connector and the PCM C1 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  3

      No 

      • Repair the (K501) Coolant Three Way Valve Control circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  3. COOLANT THREE WAY VALVE 
    1. Reconnect the Powertrain Control Module (PCM) C1 harness connector.
    2. Connect a jumper between ground and the (K501) Coolant Three Way Valve Control circuit at the Coolant Three Way Valve harness connector.
    3. Turn the ignition on.

      Is the P2862-ENGINE COOLANT BYPASS VALVE CONTROL CIRCUIT LOW DTC active or pending with the jumper in place?

      Yes 

      • Replace the Coolant Three Way Valve in accordance with the service information. After the Coolant Three Way Valve is replaced, navigate to Misc Functions, and select the Coolant Three Way Valve Replaced selection to clear the Coolant Three Way Valve actuation counter.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  4
  4. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Coolant Three Way Valve 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.
    4. Verify that there is good pin to terminal contact in the Coolant Three Way Valve and Powertrain Control Module connectors.
    5. Perform any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      • Repair as necessary.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Replace and program the Powertrain Control Module (PCM) in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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