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Home >> Jeep >> 2023 >> Grand Cherokee Altitude, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 26 (Hybrid Control Processor Module (HCP) - DTCS P0A02-00 To P0ADA-00) >> DTC Troubleshooting >> P0A44-00 Drive Motor A Position Sensor 1 Circuit OVERSPEED >> Motor A Resolver Resistance Diagnostic Test

Motor A Resolver Resistance Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. Power down the HV System. 
  2. Use special tool # 2064100080, (Electrical Test Lead Kit) to prevent any terminal damage
  3. Disconnect the appropriate Power Inverter Module (PIM) harness connector. Set the DVOM to ohms and measure the resolver resistances. Perform resistance measurements at the PIM wiring harness connector. Compare the readings to the values shown in the table.
    1. Measure resistance between the Resolver A Sin Hi circuit and Resolver A Sin Lo circuit. Record readings.
    2. Measure resistance between the Resolver A Cos Hi circuit and Resolver A Cos Lo circuit. Record readings.
    3. Measure resistance between the Resolver A Excitation Hi circuit and Resolver A Excitation Lo circuit. Record readings.
    4. If any resistance values are not within the specification, go to Step 4.
    5. If all resistance values are OK, go to Step. 6.
  4. Disconnect the MGU resolver harness connector and check the terminals on the MGU connector side and  engine wiring harness connector side for proper terminal connections for all resolver circuits. Repair as necessary and retest. If OK, with both harness connectors disconnected, check all resolver circuits below for opens, shorts to ground or short to another circuit. Repair as necessary and retest.
    1. Check Resolver A Excitation Hi circuit
    2. Check Resolver A Cos Hi circuit
    3. Check Resolver A Sin Hi circuit
    4. Check Resolver A Cos Lo circuit
    5. Check Resolver A Sin Lo circuit
    6. Check Resolver A Excitation Lo circuit
    7. If no problems are found with any resolver circuits, go to Step 5.
  5. Verify MGU actual resolver resistances with a DVOM at the MGU harness connector (MGU side) by setting the DVOM to ohms and measure the resolver circuit resistances. Compare the readings to the values shown in the table.
    1. Measure resistance between the Resolver A Sin Hi circuit and Resolver A Sin Lo circuit. Record readings.
    2. Measure resistance between the Resolver A Cos Hi circuit and Resolver A Cos Lo circuit. Record readings.
    3. Measure resistance between the Resolver A Excitation Hi circuit and Resolver A Excitation Lo circuit. Record readings.
    4. If any resistance values are not within the specification, replace the MGU in accordance with the Service Information.
    5. If no problems are found with any resolver circuits, go to Step 6.
  6. Inspect the MGU, serpentine belt, and MGU pulley.
    1. Verify that the serpentine belt is tight on the MGU pulley.
    2. Verify MGU pulley moves freely and no abnormal noises when spun.
    3. Verify MGU pulley and nut is not loose.
    4. If any problems are found with the MGU pulley, replace the MGU and recheck operation.
    5. If the MGU was replaced, perform the resolver relearn routine with the scan tool.
    6. If no problems are found with the MGU pulley, go to Step 7.
  7. Check the Power Inverter Module (PIM) harness connectors for proper connection at the module. Verify that the connector is completely plugged in and properly locked prior to disconnecting for testing. Disconnect the PIM harness connector and check for any pushed out, damaged, corroded or spread terminals. Using the appropriate SYSTEM WIRING DIAGRAMS as a guide, check all related circuits and harness connectors.
    1. If any damage is found to the connector or terminals, repair the connector and retest.
    2. If the connector and terminals appear in good shape, continue to Step 8.
  8. Replace the Power Inverter Module (PIM) in accordance with the Service Information.
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