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Home >> Fiat >> 2017 >> 500 Lounge, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 36 (1.4L Turbo - DTCS P0271-00 To P0615-00 - 500) >> DTC Troubleshooting >> P0340-00 Camshaft Position Sensor Circuit >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read DTCs. Copy DTC and Freeze Frame information.
    3. Start the engine and allow it to idle.
      WARNING:

      When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

      NOTE:

      Attempt to operate the vehicle under conditions similar to which the DTC was set.

      NOTE:

      It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set.

    4. With the scan tool, read DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

      • Go To  9
  2. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Measure the resistance of the (F856) 5-Volt Supply circuit between the CMP Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  3

      No 

      • Repair the (F856) 5-Volt Supply circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  3. CHECK THE (K900) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K900) Sensor Ground circuit between the CMP Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (K900) Sensor ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  4. CHECK THE (K44) CMP SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K44) CMP Signal circuit between the CMP Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (K44) CMP Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE CAMSHAFT POSITION SENSOR FOR PROPER MOUNTING 
    1. Inspect the CMP Sensor for damage, proper mounting and torque. If a problem is found repair as necessary.

      Is the CMP Sensor correctly mounted and torqued?

      Yes 

      • Go To  6

      No 

  6. CHECK THE CAMSHAFT TONE WHEEL FOR DAMAGE 
    1. Remove the CMP Sensor.
    2. Inspect the Camshaft Tone Wheel for damage in accordance with the service information. Refer to CAMSHAFT, ENGINE, REMOVAL . The "Clear Misfire TLC" Procedure  must be performed every time there has been a repair/replacement made to a CMP Sensor and/or CKP sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set. With the scan tool, perform the "Cam/Crank Relearn" Procedure.

      Is the Camshaft Tone Wheel damaged?

      Yes 

      • Replace the Camshaft Tone Wheel in accordance with the service information. Refer to SENSOR, CAMSHAFT POSITION . The "Clear Misfire TLC" Procedure  must be performed every time there has been a repair/replacement made to a CMP Sensor and/or CKP Sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set. With the scan tool, perform the "Cam/Crank Relearn" Procedure.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. REPLACE THE CMP SENSOR AND RETEST FOR DTCS 
    1. Turn the ignition off.
    2. Replace the CMP Sensor in accordance with the service information. Refer to SENSOR, CAMSHAFT POSITION .
    3. Connect the component and PCM harness connectors.
    4. Turn the ignition on.
    5. With the scan tool, erase all DTCs.
    6. Turn the ignition off for a minimum of 10.0 seconds.
    7. Turn the ignition on.
    8. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    9. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  8

      No 

  8. 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 

      • The wiring or poor connection problem has been repaired.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. ERRATIC CMP SIGNAL 
    1. With a lab scope, back probe the CMP Signal circuit in the CMP harness connector.
      WARNING:

      When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

    2. Turn the ignition on.
    3. Wiggle the related wire harness and lightly tap the Camshaft Position Sensor.
    4. Observe the lab scope screen.
    5. Allow the engine to idle.
    6. Observe the lab scope screen.

      Did the CMP Sensor generate any erratic pulses?

      Yes 

      • Verify that there is good pin to terminal contact in the CMP Sensor and the Powertrain Control Module connectors. If OK, inspect the Camshaft tone wheel for irregularities. If the tone wheel is distorted replace the Camshaft in accordance with the Service Information. Refer to CAMSHAFT, ENGINE, REMOVAL . If no problems were found with the tone wheel, replace the Camshaft Position Sensor. Refer to . The "Clear Misfire TLC" Procedure  must be performed every time there has been a repair/replacement made to a CMP Sensor and/or CKP sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set. With the scan tool, perform the "Cam/Crank Relearn" Procedure.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

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