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Home >> Infiniti >> 2007 >> QX56 RWD >> Repair and Diagnosis >> Transmission >> Automatic Transmission >> DTC P0615 Start Signal Circuit >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK STARTER RELAY 

    With CONSULT-II 

    1. Turn ignition switch "ON". (Do not start engine.)
    2. Select "SELECTION FROM MENU" in "DATA MONITOR" mode for "A/T" with CONSULT-II and check monitor "STARTER RELAY" ON/OFF.
    STARTER RELAY VALUE DISPLAY CHART

    Item name Condition Display value
    STARTER RELAY Selector lever in "N", "P" positions. ON
    Selector lever in other positions. OFF
    Fig 1: Checking Starter Relay
    G04900946

    Without CONSULT-II 

    1. Turn ignition switch "ON". (Do not start engine.)
    2. Check voltage between the IPDM E/R connector and ground.
      STARTER RELAY VOLTAGE SPECIFICATION

      Item Terminal Shift position Voltage (Approx.)
      Starter relay 48 Ground "N" and "P" Battery voltage
      "R" and "D" 0V
      Fig 2: Checking IPDM E/R Connector And Ground Voltage
      G04900947

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 2.

  2. CHECK HARNESS BETWEEN A/T ASSEMBLY HARNESS CONNECTOR AND IPDM E/R CONNECTOR. 
    1. Turn ignition switch OFF.
    2. Disconnect A/T assembly harness connector and IPDM E/R connector.
      CONTINUITY SPECIFICATION

      Item Connector Terminal Continuity
      A/T assembly harness connector F9 9 Yes
      IPDM E/R connector E122 48
      Fig 3: Identifying A/T Assembly Harness Connector And IPDM E/R Connector
      G04900948
    3. Check continuity between A/T assembly harness connector and IPDM E/R connector.
    4. If OK, check harness for short to ground and short to power.
    5. Reinstall any part removed.

    OK or NG 

    OK: GO TO 3.

    NG: Repair open circuit or short to ground or short to power in harness or connectors.

  3. CHECK TERMINAL CORD ASSEMBLY 
    1. Remove control valve with TCM. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
    2. Disconnect A/T assembly harness connector and TCM connector.
    3. Check continuity between A/T assembly harness connector terminal and TCM connector terminal.
      CONTINUITY SPECIFICATION

      Item Connector Terminal Continuity
      A/T assembly harness connector F9 9 Yes
      TCM connector F502 8
      Fig 4: Checking A/T Assembly Harness Connector Terminal And TCM Connector Terminal Continuity
      G04875860
    4. If OK, check harness for short to ground and short to power.
    5. Reinstall any part removed.

    OK or NG 

    OK: GO TO 4.

    NG: Replace open circuit or short to ground and short to power in harness or connectors.

  4. DETECT MALFUNCTIONING ITEM 

    Check the following items:

    OK or NG 

    OK: Replace the control valve with TCM. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 "

    NG: Repair or replace damaged parts.

  5. CHECK DTC 

    Perform "DTC Confirmation Procedure".

    OK or NG 

    OK: INSPECTION END

    NG: GO TO  2.

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