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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 20 ((Power Inverter Module (PIM) - Electrical Diagnostics - 500 - Electric)) >> DTC Troubleshooting >> P0A78-00-Drive Motor A Inverter Performance >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. PERFORM VISUAL INSPECTION OF 3-PHASE WIRING HARNESS BETWEEN E-MOTOR AND PIM 
    NOTE:

    Any time the Power Inverter Module (PIM) cover is removed, it MUST BE REPLACED due to a non reusable seal.

    1. Disconnect 3 Phase harness from PIM and e-Motor, and inspect for corrosion.

      Was there any corrosion at connections?

      Yes 

      Replace 3 Phase Wire Harness according to written service procedure.

      No 

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  2. CHECK PIM DIODE 
    1. Disconnect 12V Battery.
    2. Disconnect the 28 way Low Voltage connector from PIM.
      NOTE:

      Any time the Power Inverter Module (PIM) cover is removed, it MUST BE REPLACED due to a non reusable seal.

    3. Disconnect all High Voltage wires from PIM.
    4. Measure Diode with multimeter.
    5. Measure T-Plus (3 Measurements) : U/V/W and record.
    6. Measure T-Minus (3 Measurements) : U/V/W and record.

      Were the readings between 0.2V and 0.4V ?

      yes 

      • Go To  3

      No 

  3. CHECK E-MOTOR 
    1. Perform isolation measurements of PIM.

      Refer to ISOLATION MEASUREMENTS OF PIM .

    2. Perform isolation measurements of e-Motor.

      Refer to ISOLATION MEASUREMENTS OF E-MOTOR .

    3. Perform isolation measurement of 3 phase wiring harness.

      Refer to ISOLATION MEASUREMENT OF 3 PHASE WIRING HARNESS .

    4. Check electrical resistance of e-Motor phases.

      Refer to CHECK ELECTRICAL RESISTANCE BETWEEN E-MOTOR PHASES .

      Did any of the above tests fail?

      Yes 

      • Repair in accordance with the service information.
      • Perform the EVCU VERIFICATION TEST. Refer to EVCU VERIFICATION TEST .

      No 

      • The condition that caused the DTC to set is not present at this time.
      • Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .