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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 84 (3.6L - DTCS P0463 To P06DA) >> Diagnosis And Testing >> P0643-Primary 5-Volt Supply Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2014 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DTC 
    NOTE:

    Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test.

    1. Turn the ignition on for at least 60 seconds.
    2. With a scan tool, read the active DTCs.

      Is the DTC Active at this time?

      Yes 

      • Go To  2

      No 

  2. CHECK THE 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 1: Checking 5-Volt Supply For Short To Voltage
    GC0149901Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect all the Sensor harness connectors that share the (F855) 5-Volt Supply circuit.
    3. Disconnect the APP Sensor harness connector.
      NOTE:

      Improperly installed aftermarket accessories can cause this DTC to set. Check for wiring added by customer.

    4. Ignition on, engine not running.
    5. Measure the voltage on the (F855) 5-Volt Supply circuit at the CKP Sensor harness connector.

      Is the voltage reading above 5.2 Volts?

      Yes 

      • Repair the short to voltage in the (F855) 5-Volt Supply circuit or the (K852) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensors 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 related Sensor and Powertrain Control Module connectors.
    4. Perform any Technical Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No