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Home >> Jeep >> 2023 >> Grand Cherokee Altitude, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 28 (Hybrid Control Processor Module (HCP) - DTCS P0BF0-00 To P0C74-00) >> DTC Troubleshooting >> P0BFB-00 Drive Motor "B" Phase W Current Sensor Circuit Low >> Motor B Phase Resistance Test

Motor B Phase Resistance Test

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  1. Power down the HV System. 
    1. If any damage is found to the transmission or Power Inverter Module (PIM) harness connectors or terminals, repair the connector and retest.
    2. If the connector and terminals appear in good shape, continue to step 2.
  2. Disconnect the transmission HV motor harness connector. Set the DVOM to ohms and measure the U-V-W terminals. Perform resistance measurements between the circuits at the 3 High Voltage Terminals at the transmission and compare the readings to the values shown in the table.
    1. Measure (U-V) phase resistance (transmission side). Record readings.
    2. Measure (V-W) phase resistance (transmission side). Record readings.
    3. Measure (W-U) phase resistance (transmission side). Record readings.
    4. If any resistance values are not within the specification, replace the transmission in accordance with the service information.
    5. If all resistance values are OK, go to Step. 3
  3. 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.
    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 4.
  4. Replace the Power Inverter Module (PIM) in accordance with the service information. Refer to: POWER INVERTER MODULE (PIM) / REMOVAL AND INSTALLATION .
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