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Diagnostic System Check - Vehicle

Diagnostic Instructions
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic System Check Instructions provides an overview of each diagnostic category.
    • Continue through the Diagnostic System Check until you are directed to follow a particular diagnostic or repair procedure. Once a repair has been completed, perform the Diagnostic Repair Verification and verify the customer concern has been corrected.

The diagnostic procedures within this manual are developed on the assumption that the following areas function as designed:

    • The 12 V battery is fully charged and cables are clean and tight. Refer to Battery Inspection/Test .
    • Fuses are not open. Refer to Power Distribution Schematics and Electrical Centre Identification Views .
    • Ground circuits for the area of customer concern are clean, tight, and in the correct location. Refer to Ground Distribution Schematics and Harness Routing Views .
    • All connections/connectors for the area of concern are fully seated. Refer to Component Connector End Views .
    • There are no aftermarket devices that affect the operation of the system. Refer to Checking Aftermarket Accessories .
    • The scan tool powers up. Refer to Scan Tool Does Not Power Up .

Diagnostic System Check
  1. VERIFY CUSTOMER CONCERN - Understand and validate the customer concern. Inspect the visible system components for obvious damage or conditions that may cause the concern.
  2. BULLETIN SEARCH - Check for related bulletins, recalls/field actions, and preliminary information.
  3. MECHANICAL CONCERNS - Verify the symptom is not exclusively a mechanical concern.
    4. ⇒If the symptom is exclusively a mechanical concern
        Refer to Symptoms - Vehicle .
    ⇓   If the symptom is not a mechanical concern

    Note: Do not clear any DTCs unless instructed to do so by a diagnostic procedure. If any DTC is Powertrain related, select Capture Info to store DTC and Freeze Frame/Failure Records to the scan tool.

  4. VEHICLE POWER UP VERIFICATION - Vehicle in Service Mode, verify the vehicle powers up.
    5. ⇒If the vehicle does not power up
        Refer to Power Mode Mismatch .
    ⇓   If the vehicle powers up
  5. CONTROL MODULE COMMUNICATION and DTC CHECK - Using a scan tool, perform the Vehicle DTC Information function and verify at least one control module communicates with the scan tool. Record on the Repair Order the following information:
    6. • Any control module that is not communicating.
    • Any DTC, including symptom byte, and the control module that has set the DTC.
    ⇒If the scan tool does not communicate with any control module on the vehicle
        Refer to Data Link References .
    ⇓   If the scan tool communicates with any control module
  6. CONTROL MODULE INTERNAL PERFORMANCE FAULTS - Verify there is no current control module Internal Performance DTCs set.
    7. ⇒If any DTC of this type is set
        Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
    ⇓   If no DTC of this type is set
  7. CONTROL MODULE COMMUNICATION VERIFICATION - Verify the vehicle is not built with any control module listed as not communicating with the scan tool; refer to Data Link References .
    8. ⇒If the vehicle is built with a control module that is not communicating
        Refer to Data Link References .
    ⇓   If all control modules the vehicle is built with are communicating
  8. COMMUNICATION and POWERMODE FAULTS - Verify there are no current control module Power Mode or Communication DTCs set.
    9. ⇒If any DTC of this type is set
        Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
    ⇓   If no DTC of this type is set

    Note: The electric propulsion system will be active in the vehicle ON state during this test. Ensure the vehicle is out of gear and the handbrake is applied. Turn the vehicle power mode to vehicle OFF as soon as the vehicle ON power mode parameter has been observed.

  9. POWER MODE VERIFICATION - Driver door open, observe the scan tool Power Mode parameter while cycling the push button switch through all the power modes. Verify the current Power Mode parameter matches the actual vehicle power mode states.
    10. ⇒If the Power Mode parameter does not match the vehicle power mode states
        Refer to Power Mode Mismatch .
    ⇓   If the Power Mode parameter matches the vehicle power mode states
  10. REMAINING DTC REVIEW - Verify there are no other DTCs set.
    11. ⇒If other DTCs are set
        Diagnose them in the order listed below. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
    10.1. Voltage DTCs
    10.2. Programming, Setup or Configuration or Software Performance DTCs
    10.3. Component related DTCs
    10.4. System related DTCs
    10.5. Any remaining DTCs
    ⇓   If no other DTCs are set
  11. EMISSION RELATED INSPECTION/MAINTENANCE TESTING CONCERNS - If inspection and maintenance checks are required in your region, verify the customer concern is not related to inspection/maintenance testing.
    12. ⇒If the customer concern is related to inspection/maintenance testing
        Refer to Inspection/Maintenance System Check .
    ⇓   If the customer concern is not related to inspection/maintenance testing
  12. SYMPTOM DIAGNOSIS - Diagnose any remaining customer concern. Refer to Symptoms - Vehicle .
   


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