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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (2.9L Pcm 1 - DTCS P06DC-00 To P2097-00) >> DTC Troubleshooting >> P0727-00-Engine Speed Input Circuit - No Signal >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE DTC 
    1. Start the engine and allow it to idle.
    2. With the scan tool, read and record DTCs.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (B12) ENGINE SPEED SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Ignition Control Module C1 harness connectors.
    3. Disconnect the PCM-1 C1 harness connector.
    4. Check for continuity between the (B12) Engine Speed Signal Circuit and all other circuits at the PCM-1 C1 harness connector.

      Is there continuity between ground and the (B12) Engine Speed Signal Circuit and any other circuit?

      Yes 

      • Repair the (B12) Engine Speed Signal Circuit for a short to the circuit that showed continuity.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (B12) ENGINE SPEED SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (B12) Engine Speed Signal Circuit at the Ignition Coil Control Module C1 harness connector.

      Is there continuity between ground and the (B12) Engine Speed Signal Circuit?

      Yes 

      • Repair the (B12) Engine Speed Signal Circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (B12) ENGINE SPEED SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (B12) Engine Speed Signal Circuit between the Ignition Control Module C1 harness connector and the PCM-1 C1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (B12) Engine Speed Signal for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. REPLACE THE IGNITION CONTROL MODULE AND RETEST FOR DTC 
    1. Replace the Ignition Control Module in accordance with the Service Information.
    2. Connect the Ignition Control Module and PCM harness connectors.
    3. Turn the ignition on.
    4. With the scan tool, erase DTCs.
    5. Using the Freeze Frame Data or When Monitored Conditions above, operate the vehicle within the conditions that set the DTC.
    6. With the scan tool, read DTCS.

      Did the DTC return?

      Yes 

      • Go To  6

      No 

      • Replacing the Ignition Control Module repaired the fault.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all PCM-1 harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. 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.

    5. Connect all PCM-1 harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Connect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    10. 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 .
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