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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK VALVE RESISTANCE 
    1. Turn ignition switch to OFF position.
    2. Disconnect terminal cord assembly connector in engine compartment.
    3. Check resistance between terminal cord assembly harness connector terminal 4 and ground.

      Resistance : 2.5 - 5Ω 

    OK or NG 

    1. OK: GO TO  3.
    2. NG: GO TO 2.
    Fig 1: Checking Resistance Between Terminal Cord Assembly Harness Connector Terminal 4 And Ground
    G02160846Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK VALVE OPERATION 
    1. Remove Control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
    2. Check the following items:
    • Line pressure solenoid valve
    • Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal and ground.
    • Harness of terminal cord assembly for short or open

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair or replace damaged parts.
    Fig 2: Checking Operation Of Line Pressure Solenoid Valve
    G02160847Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK POWER SOURCE AND DROPPING RESISTOR CIRCUIT 
    1. Turn ignition switch to OFF position.
    2. Disconnect TCM harness connector.
    3. Check resistance between terminal 4 (G/R) and TCM harness connector terminal 2 (W/B).

      Resistance : 10 - 15Ω 

    OK or NG 

    1. OK: GO TO  5.
    2. NG: GO TO 4.
    Fig 3: Checking Resistance Between Terminal 4 (G/R) And TCM Harness Connector Terminal 2 (W/B)
    G02160848Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING ITEM 

    Check the following items:

    • Dropping resistor
    • Check resistance between two terminals.

      Resistance : 10 - 15Ω 

    • Harness for short or open between TCM terminal 2 and terminal cord assembly (Main harness)

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Repair or replace damaged parts.
    Fig 4: Checking Resistance Between Two Terminals Of Dropping Resistor
    G02160849Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK POWER SOURCE CIRCUIT 
    1. Turn ignition switch to OFF position.
    2. Check continuity between terminal cord assembly harness connector terminal 4 and TCM harness connector terminal 1. Refer to "WIRING DIAGRAM - AT - LPSV ".

      Continuity should exist. 

    3. Reinstall any part removed.

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  6. CHECK DTC 

    Perform "DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE ".

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO 7.
  7. CHECK TCM INSPECTION 
    1. Perform TCM input/output signal inspection.
    2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: Repair or replace damage parts.
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