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Home >> Infiniti >> 2005 >> Q45 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1211 To P2138 >> DTC P1217: Engine Over Temperature >> Diagnostic Procedure >> Procedure B
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Procedure B

  1. CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan relay-1.
    3. Turn ignition switch ON.
      Fig 1: Locating Cooling Fan Relay-1
      G02376058Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between cooling fan relay-1 terminals 1, 5 and ground with CONSULT-II or tester.
      1. Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO 3.
    2. NG: GO TO 2.
    Fig 2: Checking Voltage Between Cooling Fan Relay-1 Terminals 1, 5 And Ground
    G02376059Courtesy of NISSAN MOTOR CO., U.S.A.
  2. DETECT MALFUNCTIONING PART 

    Check the following.

    • 10A fuse
    • 40A fusible link
    • Fuse, fusible link and relay block (J/B) connector E3
    • Harness for open or short between cooling fan relay-1 and fuse
    • Harness for open or short between cooling fan relay-1 and battery
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  3. CHECK COOLING FAN MOTOR CONTROL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan motors-1 and -2 harness connector.
    3. Check harness continuity between the following terminals.

      cooling fan motor-2 terminal 3 and cooling fan relay-1 terminal 6, cooling fan relay-1 terminal 7 and ground, cooling fan relay-1 terminal 3 and cooling fan motor-1 terminal 1.

      Refer to WIRING DIAGRAM .

      1. Continuity should exist. 
    4. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
    Fig 3: Locating Cooling Fan Motors-1 And -2 Harness Connector
    G02376060Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK COOLING FAN MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between cooling fan relay-1 terminal 2 and ECM terminal 28.

      Refer to WIRING DIAGRAM .

      1. Continuity should exist. 
    3. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO 6.
    2. NG: GO TO 5.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E34, F34
    • Harness for open or short between cooling fan relay-2 and ECM
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  6. CHECK COOLING FAN RELAY-1 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Replace cooling fan relay.
  7. CHECK COOLING FAN MOTORS-1 AND -2 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Replace cooling fan motors.
  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. INSPECTION END 
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