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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L - DTCS P2237-00 To P2AE1-00 >> DTC Troubleshooting >> P2308-00-Ignition Coil "C" Secondary Circuit >> Possible Causes >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Diagnose any ASD related DTCs before continuing.

    1. Start the engine and allow it to idle.
    2. With the scan tool, read DTCs and record on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK THE FUSED ASD RELAY OUTPUT CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the Ignition Coil harness connector.
    3. Turn the ignition on.
    4. With a scan tool, actuate the ASD Relay.
    5. With a 12-volt test light connected to ground, probe the Fused ASD Relay Output circuit at the Ignition Coil harness connector.

      Is the test light illuminated and bright?

      Yes 

      • Go To  3

      No 

      • Repair the Fused ASD Relay Output circuit for an open or short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
        NOTE:

        Stop All Actuations.

  3. CHECK THE IGNITION COIL CONTROL OPERATION 
    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.

    1. With a 12-volt test light connected to a 12 volt source, probe the (K18) Coil Control 3 circuit at the Ignition Coil harness connector.
    2. Crank the engine for 5.0 seconds while observing the test light.

      What is the condition of the test light while cranking the engine?

      Brightly blinking 

      • Go To  4

      ON constantly 

      • Go To  5

      OFF constantly 

      • Go To  6
  4. CHECK THE SPARK PLUG 
    1. Turn the ignition off.
    2. Remove the Spark Plug(s) in accordance with the Service Information.
    3. Inspect the Spark Plug(s) for the following conditions:
      • Cracks
      • Carbon Tracking
      • Foreign Material
      • Gap size out of specifications
      • Loose or broken electrode
      NOTE:

      Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move.

      Were any of the above conditions present?

      Yes 

      • Replace the Spark Plug in accordance with the Service Information. Refer to SPARK PLUG, REMOVAL AND INSTALLATION .
        NOTE:

        If carbon tracking is found on the Spark Plug, inspect the boot on the Ignition Coil assembly for signs of damage and replace if necessary.

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

      No 

      • Replace the Ignition Coil and Spark Plug in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE (K18) COIL CONTROL 3 CIRCUIT FOR A SHORT TO GROUND 
    1. Disconnect the PCM C2 harness connector.
    2. Check for continuity between ground and the (K18) Coil Control 3 circuit at the Ignition Coil harness connector.

      Is there continuity between ground and the (K18) Coil Control 3 circuit?

      Yes 

      • Repair the (K18) Coil Control 3 circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  6. CHECK THE (K18) COIL CONTROL 3 CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Measure the resistance of the (K18) Coil Control 3 circuit between the Ignition Coil harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (K18) Coil Control 3 circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECKING FOR THE CAUSE OF THIS DTC SETTING 
    NOTE:

    An internally shorted or damaged secondary coil circuit can cause a PCM coil driver failure. Do not replace the PCM without first determining if the Ignition Coil is the cause of the failure.

    1. Remove the Ignition Coil that is controlled by the coil driver setting the DTC.
    2. Install the Ignition Coil onto another coil location that did not have a DTC set against it.
    3. Turn the ignition on.
    4. With the scan tool, erase DTCs.
    5. Start the engine and allow it to idle for up to one minute.
      NOTE:

      If the engine will not start, crank the engine three times for 10 seconds.

    6. With the scan tool, read DTCs and record on the repair order.

      Did a correlating fault set for the new coil location?

      Yes 

      No 

      • Go To  8
  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 and record on the repair order.

      Did the DTC return?

      Yes 

      No 

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