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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 2.0L - DTCS P0261-00 To P046C-00 >> DTC Troubleshooting >> P0336-00-Crankshaft Position Sensor "A" Circuit Range/Performance >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR APPLICABLE SERVICE BULLETINS 
    1. Check for any applicable Service Bulletins that may apply for this issue.

      Were any Service Bulletins applicable?

      Yes 

      • Perform the applicable Service Bulletins. Erase the DTC and perform the verification test.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  2
  2. CHECK FOR AN ACTIVE DTC 
    1. With the scan tool, read Powertrain Control Module (PCM) DTCs and Freeze Frame Data and record on the repair order.
    2. Using the recorded Freeze Frame Data and the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
      NOTE:

      If the vehicle starts and runs, wiggle test the wiring and see if problem duplicates or the fault sets.

    3. With the scan tool, read PCM DTCs.

      Is the DTC active or pending?

      Yes 

      • Go To  5

      No 

      • Go To  3
  3. WIRE HARNESS AND CKP SENSOR INSPECTION 
    1. Turn the ignition off.
    2. Disconnect the harness connectors at the PCM and Crank Sensor and inspect for wire chaffing or rub conditions, terminals pushed out on the wiring connector, bent terminals at the PCM and Crank Sensor, water in the connector cavities or presence of corrosion on the terminals of the connectors or components.
    3. Visually inspect the mounting area of Crank Sensor for debris, damage or a loose sensor. Remove the Crank Sensor and inspect the end of the sensor for signs of damage or debris. Rotate the engine and if possible, inspect the target wheel for any signs of damage. Reinstall the Crank Sensor and ensure that the sensor is properly installed and torqued to proper specification.
      NOTE:

      This DTC is set by an intermittent loss of the signal and the most likely cause is a poor connection at the Crank Sensor, PCM terminals or a poor signal between the Crank Sensor and target wheel. Unplugging and reconnecting the harness connectors or repositioning the Crank Sensor will often repair the condition that set the DTC.

      Were any problems found?

      Yes 

      No 

      • Go To  4
  4. CHECK THE VEHICLE REPAIR HISTORY 
    1. Check the history of the vehicle for previous crank sensor related DTCs within the past 90 days.

      Did the repair history show that the vehicle was in dealership for a crank sensor fault within the past 90 days?

      Yes 

      • Replace the Crank Sensor in accordance with the Service Information. With the scan tool, perform the "The Phonic Wheel Reset"  Procedure.
        NOTE:

        "The Phonic Wheel Reset"  procedure must be performed every time there has been a repair or replacement made to a CMP Sensor, CKP sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set.

      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Test complete. Reconnect the harness connectors and erase the DTC. The most likely cause was a poor connection at one of the harness connectors. Verify the DTC does not return.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE (F855) 5-VOLT SUPPLY CIRCUIT VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the CKP Sensor harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (F855) 5-Volt Supply circuit at the CKP Sensor harness connector.

      Is the voltage between 4.8 and 5.2 volts?

      Yes 

      • Go To  6

      No - voltage is below 4.8 volts: 

      • Repair the 5-Volt Supply circuit for an open or short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No - voltage is above 5.2 volts: 

      • Repair the 5-Volt Supply circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK THE (K24) CKP SIGNAL CIRCUIT VOLTAGE 
    1. Measure the voltage on the (K24) CKP Signal circuit at the CKP Sensor harness connector.

      Is the voltage between 4.8 and 5.2 volts?

      Yes 

      • Go To  7

      No - voltage is below 4.8 volts: 

      • Go To  9

      No - voltage is above 4.8 volts: 

      • Repair the CKP Sensor Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK THE (K925) SENSOR GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Measure the resistance of the (K925) CKP Sensor Ground circuit between the CKP Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  8

      No 

      • Repair the (K925) CKP Sensor Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. TONE WHEEL/PULSE RING INSPECTION 
    1. Turn the ignition off.
    2. Disconnect the battery ground cable.
    3. Remove the CKP Sensor.
    4. Visually inspect the sensor mounting location for damage and foreign material.
    5. Rotate the engine and if possible, inspect the target wheel for any signs of damage.

      Were any problems found?

      Yes 

      • Repair as necessary. With the scan tool, perform "The Phonic Wheel Reset"  Procedure.
        NOTE:

        "The Phonic Wheel Reset"  procedure must be performed every time there has been a repair or replacement made to a CMP Sensor, CKP sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set.

      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Replace the Crank Position Sensor in accordance with the Service Information. With the scan tool, perform the "The Phonic Wheel Reset"  Procedure.
        NOTE:

        "The Phonic Wheel Reset"  procedure must be performed every time there has been a repair or replacement made to a CMP Sensor, CKP sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set.

      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. CHECK THE (K24) CKP SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Check for continuity between ground and the (K24) CKP Signal circuit at the PCM C2 harness connector.

      Is there continuity between ground and the (K24) CKP Signal circuit?

      Yes 

      • Repair the (K24) CKP Signal circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  10
  10. CHECK THE (K24) CKP SIGNAL CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (K24) CKP Signal circuit between the Crankshaft Position Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  11

      No 

      • Repair the (K24) CKP Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  11. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all PCM harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
    10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    11. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

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