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DTC P1429 (38): Motor Driver Module (MDM) Overheating Signal Circuit Problem; DTC P1438 (38): Motor Driver Module (MDM) Overheating Signal Circuit Problem

NOTE:
  • Information marked with an asterisk (*) applies to 2005-2006 models.
  • Information marked with double asterisk (**) applies to 2000-2004 models.
  1. Reset the MCM (see HOW TO RESET THE MCM ).
  2. Turn the ignition switch ON (II).

    Is DTC P1429 (38)* (P1438 (38)**) indicated? 

    1. YES  - Go to step 3.
    2. NO  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the voltage converter module and at the MCM.
  3. Turn the ignition switch OFF.
  4. Turn the battery module switch OFF (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
  5. Remove the IPU lid (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
  6. Turn the ignition switch ON (II).
  7. Measure voltage between MCM connector terminals A13 and A24.
    Fig 1: Measuring Voltage Between MCM Connector Terminals A13 And A24
    G03681308Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES  - Substitute a known-good MCM, and recheck. If the symptom/indication goes away, replace the original MCM.
    2. NO  - Go to step 8.
  8. Turn the ignition switch OFF.
  9. Check for continuity between MCM connector terminal A13 and body ground.
    Fig 2: Checking Continuity Between MCM Connector Terminal A13 And Body Ground
    G03681309Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 10.
    2. NO  - Go to step  14.
  10. Disconnect the power converter wire harness 24P connector.
  11. Check for continuity between MCM connector terminal A13 and body ground.
    Fig 3: Checking Continuity Between MCM Connector Terminal A13 And Body Ground
    G03681310Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 12.
    2. NO  - Check for a short to ground in the wire between the power converter harness 24P connector and the voltage converter module. If the wire is OK, replace the voltage converter module.
  12. Disconnect MCM connector A (32P).
  13. Check for continuity between MCM connector terminal A13 and body ground.
    Fig 4: Checking Continuity Between MCM Connector Terminal A13 And Body Ground
    G03681311Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short to ground in the wire between the power converter wire harness 24P connector and the MCM (A13).
    2. NO  - Substitute a known-good MCM, and recheck. If the symptom/indication goes away, replace the original MCM.
  14. Disconnect the power converter wire harness 24P connector.
  15. Connect power converter wire harness 24P connector terminal No. 23 to body ground with a jumper wire.
    Fig 5: Connecting Power Converter Wire Harness 24P Connector Terminal No. 23 To Body Ground Using Jumper Wire
    G03681312Courtesy of AMERICAN HONDA MOTOR CO., INC.
  16. Check for continuity between MCM connector terminal A13 and body ground.
    Fig 6: Checking Continuity Between MCM Connector Terminal A13 And Body Ground
    G03681313Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Check for an open in the wire between the power converter wire harness 24P connector and the voltage converter module (B4). If the wire is OK, replace the voltage converter module.
    2. NO  - Repair open in the wire between the power converter wire harness 24P connector and the MCM (A13).
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