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Diagnostic Procedure For Water Valve

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK WATER VALVE RELAY POWER INPUT CIRCUITS 
    1. Turn ignition switch OFF.
    2. Disconnect water valve relay connector M7.
    3. Check voltage between water valve relay harness connector terminals and ground.
      Fig 1: Water Valve Relay Harness Connector Terminals And Ground Voltage Specifications
      G02385650Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: Checking Voltage Between Water Valve Relay Harness Connector Terminals And Ground
      G02385651Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 2.
    • NG: Repair harness or connector.
  2. CHECK WATER VALVE CONTROL 
    1. Turn ignition switch ON.
    2. Select MAX A/C with mode switch.
    3. Check continuity between water valve relay harness connector M7 terminal 1 (W/G) and ground, as MAX A/C is switched OFF and ON.
      Fig 3: Water Valve Relay Harness Connector M7 Terminal 1 And Ground Continuity Specifications
      G02385652Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 4: Checking Continuity Between Water Valve Relay Harness Connector M7 Terminal 1 And Ground
      G02385653Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 4.
    • NG: GO TO 3.
  3. CHECK WATER VALVE CONTROL OUTPUT CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect front air control connector M50.
    3. Check continuity between water valve relay harness connector M7 terminal 1 (W/G) and front air control harness connector M50 terminal 29 (W/G).
      • 1 - 29: Continuity should exist. 
    4. Check continuity between water valve relay harness connector M7 terminal 1 (W/G) and ground.
      • 1 - Ground: Continuity should not exist. 

    OK or NG

    • OK: Replace front air control. Refer to "FRONT AIR CONTROL ".
    • NG: Repair harness or connector.
    Fig 5: Checking Continuity Between Water Valve Relay Harness Connector M7 Terminal 1 And Front Air Control Harness Connector M50 Terminal 29
    G02385654Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK WATER VALVE RELAY 

    Check water valve relay. Refer to "WATER VALVE RELAY ".

    OK or NG

    • OK: GO TO 5
    • NG: Replace water valve relay.
  5. CHECK WATER VALVE GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect water valve connector F68.
    3. Check continuity between water valve harness connector F68 terminal - (B) and ground.
      • (-) - Ground: Continuity should exist. 

    OK or NG

    • OK: GO TO 6.
    • NG: Repair harness or connector.
    Fig 6: Checking Continuity Between Water Valve Harness Connector F68 Terminal - And Ground
    G02385655Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK WATER VALVE POWER CIRCUIT 
    1. Check continuity between water valve relay connector terminal 5 (Y/L) and water valve connector F68 terminal + (Y/L)
      • 5 - +: Continuity should exist. 
    2. Check continuity between water valve relay harness connector M7 terminal 5 (Y/L) and ground.
      • 5 - Ground: Continuity should not exist. 

    OK or NG

    • OK: Replace water valve.
    • NG: Repair harness or connector.
    Fig 7: Checking Continuity Between Water Valve Relay Connector Terminal 5 And Water Valve Connector F68 Terminal +
    G02385656Courtesy of NISSAN MOTOR CO., U.S.A.
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