PDM Power Circuit and Ground Circuit Inspection

PDM Power Circuit Inspection
1. IG "ON" & ENG "OFF"
2. Measure voltage between Power to PDM circuit and chassis ground.
3. Measure voltage between Power to ESCL circuit and chassis ground.
  (It is available to measure during ESCL operation.)
  
  Specification: Approx. 12 V
  
  Fig 1: Measuring Voltage Between Power To ESCL And PDM Circuit And Chassis Ground
  Courtesy of HYUNDAI MOTOR AMERICA
4. Are the measured voltage within specifications?
  YES
  - Go to " 2PDM Ground Circuit Inspection" procedure.
  NO
  - Check the related fuses and circuit. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
PDM Ground Circuit Inspection
1. IG "ON" & ENG "OFF"
2. Measure voltage between PDM ground circuit and chassis ground.
  Specification: Approx. 0 V
  
  Fig 2: Measuring Voltage Between PDM Ground Circuit And Chassis Ground
  Courtesy of HYUNDAI MOTOR AMERICA
3. Is the measured voltage within specifications?
  YES
  - Go to next procedure.
  NO
  - Check open or short on PDM ground circuit (PDM↔ESCL).
    Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check Open or Short on ESCL Communication Line
1. After IG "OFF", disconnect '-' terminal from battery.
2. Disconnect connectors of IPM, PDM, and ESCL.
3. Check open or short on ESCL Comm. line (ESCL↔IPM).
4. Check open or short on ESCL Enable Output line (ESCL↔IPM).
  Specification for Open check: Below 1Ω
  
  Specification for Short check: ∞ Ω
  
  Fig 3: Checking Open Or Short On ESCL Enable Output Line
  Courtesy of HYUNDAI MOTOR AMERICA
5. Are the measured resistances within specifications?
  YES
  - Substitute with a known - good ESCL and check for proper operation.
    If the problem is corrected, replace the unit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  - Substitute with a known - good PDM and check for proper operation.
    If the problem is corrected, replace the unit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  - Substitute with a known - good IPM and check for proper operation.
    If the problem is corrected, replace the unit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.