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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> 8HP50/850RE - DTCS P0219-00 To P1D91-00 >> DTC Troubleshooting >> P0563-00-System Voltage High >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR CHARGING SYSTEM DTCS 
    1. With the scan tool, read PCM DTCs.

      Are any Charging System DTCs set?

      Yes 

      • Repair Charging System DTCs. Refer to DTC INDEX .
      • Perform the TRANSMISSION VERIFICATION TEST to verify the Transmission and or TCM was not damaged. Refer to .

      No 

      • Go To  2
  2. CHECK IF VEHICLE WAS JUMP STARTED WITH 24-VOLT SYSTEM 
    NOTE:

    Some Recreational Vehicles (RVs), Buses, and Semi Tractors use 24-volt systems.

    1. Check if the vehicle was jump started by a vehicle with a 24-volt charging system.

      Was the vehicle jump started by a vehicle with a 24-volt charging system?

      Yes 

      • This is the cause of the DTC. Erase the DTC and return the vehicle to the customer.
      • Perform the TRANSMISSION VERIFICATION TEST to verify the Transmission and or TCM was not damaged. Refer to .

      No 

      • Go To  3
  3. CHECK INDICATED TCM BATTERY VOLTAGE 
    1. Start the Engine and raise the engine speed to 2, 000 rpm.
    2. With the scan tool, monitor the TCM Battery Voltage for 60 seconds.

      Does the TCM Battery Voltage read above 16 volts at any time during the test?

      Yes 

      • Go To  4

      No 

  4. COMPARE TCM VOLTAGE TO BATTERY VOLTAGE 
    1. Start the Engine and raise the engine speed to 2, 000 rpm.
    2. With the scan tool, read the TCM Battery Voltage.
    3. Measure the voltage at the Battery.
    4. Compare the readings.

      Does the measured voltage reading match the scan tool TCM Battery Voltage reading?

      Yes 

      • Repair the Charging System for an over charging condition in accordance with the Service Information.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .

      No 

      • Using the schematics as a guide, check the Transmission Control Module (TCM) connector and all related in-line connector terminals for corrosion, damage, or pushed out terminals. Pay particular attention to the power and ground circuits. If no problems are found, replace and program the TCM in accordance with the Service Information. Refer to MODULE, TRANSMISSION CONTROL (TCM), REMOVAL AND INSTALLATION .
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
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