Diagnostic Test

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.

VISUAL INSPECTION OF 3-PHASE WIRING HARNESS BETWEEN E-MOTOR AND PIM
1. Verify correct order of U/V/W connection at PIM and e-Motor.
2. Verify tight connections at PIM and e-Motor.
3. Inspect 3 Phase Wire Harness for damage (pinched, bent, cut).
  NOTE:
  Any time the Power Inverter Module (PIM) cover is removed, it MUST BE REPLACED due to a non reusable seal.
  
  Disconnect 3 Phase Wire Harness from PIM and check for melted or damaged Connectors.
  
  Was there any damage to the connectors?
  
  Yes
  - Replace 3-Phase wire harness according to written service procedure
  - Perform the EVCU VERIFICATION TEST. Refer to EVCU VERIFICATION TEST .
  No
  - Go To 2
CHECK ELECTRICAL RESISTANCE OF E-MOTOR PHASES
1. Disconnect 3 Phase Wire Harness from e-Motor.
2. Use a qualified micro Ohm measurement instrument to measure the resistance value between the three pins (U/V/W) of the e-Motor, 3 measurements in total (U-V, U-W, V-W).
  Is the Resistance OK?
  
  Yes
  - Replace the e-Motor.
    Refer to MOTOR, ELECTRIC, REMOVAL .
  - Perform the EVCU VERIFICATION TEST. Refer to EVCU VERIFICATION TEST .
  No
  - Go To 3

CHECK CONTINUITY AND SHORT CIRCUIT OF 3-PHASE WIRING HARNESS

NOTE:

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

Disconnect the 3 Phase Wire Harness from the PIM and the e-Motor.

Using a qualified Multimeter, make the following measurements.

Probe motor side pin 3 to PIM side pin 1, should be short

Probe motor side pin 2 to PIM side pin 2, should be short

Probe motor side pin 1 to PIM side pin 3, should be short

Probe motor side pin 1 to PIM side pin 1, 2, should be open

Probe motor side pin 2 to PIM side pin 1, 3, should be open

Probe motor side pin 3 to PIM side pin 2, 3, should be open

Were the above Tests true?

Yes

Test complete, the Condition that caused the DTC is not present at this time.
Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .

Replace the 3 Phase Wire Harness in accordance with the service information.
Perform the EVCU VERIFICATION TEST. Refer to EVCU VERIFICATION TEST .