Nissan Murano: Dtc/circuit Diagnosis / Cooling Fan

Nissan Murano (Z52) 2015-2024 Service Manual / Engine / Engine Control System :: Vq35de / Dtc/circuit Diagnosis / Cooling Fan

Component Function Check

CHECK COOLING FAN FUNCTION

With CONSULT

  1. Turn ignition switch ON.

  2. Perform “COOLING FAN” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.

  3. Touch “LOW”, “MID”, “HI” on the CONSULT screen.

  4. Check that cooling fan operates.

Without CONSULT

  1. Activates IPDM E/R auto active test and check cooling fan motors operation, refer to Diagnosis Description.

  2. Check that cooling fan operates.

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Proceed to Diagnosis Procedure.

Diagnosis Procedure

CHECK COOLING FAN RELAY POWER SUPPLY CIRCUIT

  1. Turn ignition switch OFF.

  2. Disconnect cooling fan relays-2, -3.

  3. Turn ignition switch ON.

  4. Check the voltage between cooling fan relays-2, -3 harness connectors and ground.

    + − Voltage
    Cooling fan relay
    Connector Terminal

    E42

    (cooling fan relay-2)     		2 Ground Battery voltage
    5

    E41

    (cooling fan relay-3)     		2
    5

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Perform trouble diagnosis for power supply circuit.

CHECK COOLING FAN RELAY OUTPUT SIGNAL CIRCUIT

  1. Turn ignition switch OFF.

  2. Disconnect IPDM E/R harness connectors.

  3. Check the continuity between cooling fan relay-2, -3 harness connectors and IPDM E/R harness connector.

    + − Continuity
    Cooling fan relay IPDM E/R
    Connector Terminal Connector Terminal

    E42

    (cooling fan relay-2)     		1 E119 27 Existed

    E41

    (cooling fan relay-3)     		1 39

  4. Also check harness for short to ground and to power.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace error-detected parts.

CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT

  1. Disconnect cooling fan motor-1 harness connector.

  2. Check the voltage between cooling fan motor-1 harness connector and ground.

    + − Voltage
    Cooling fan motor-1
    Connector Terminal
    E236 1 Ground Battery voltage
    2

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Perform trouble diagnosis for power supply circuit.

CHECK COOLING FAN MOTOR CIRCUIT-1

  1. Disconnect cooling fan motor-2 harness connector.

  2. Check the continuity between cooling fan relay-2, -3 harness connectors and cooling fan motor-1, -2 harness connectors.

    + − Continuity
    Cooling fan relay Cooling fan motor
    Connector Terminal Connector Terminal

    E42

    (cooling fan relay-2)     		3

    E237

    (Cooling fan motor-2)     		2 Existed
    7

    E236

    (Cooling fan motor-1)     		3

    E41

    (cooling fan relay-3)     		3

    E237

    (Cooling fan motor-2)     		1
    7

    E236

    (Cooling fan motor-1)     		4

  3. Also check harness for short to ground and to power.

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair or replace error-detected parts.

CHECK COOLING FAN MOTOR CIRCUIT-2

  1. Check the continuity between IPDM E/R harness connector and cooling fan motor-1, -2 harness connector.

    + − Continuity
    IPDM E/R Cooling fan motor
    Connector Terminal Connector Terminal
    E120 4

    E236

    (Cooling fan motor-1)     		4 Existed
    6

    E237

    (Cooling fan motor-2)     		1

  2. Also check harness for short to ground and to power.

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair or replace error-detected parts.

CHECK COOLING FAN MOTOR CIRCUIT-3

  1. Check the continuity between cooling fan relay-2, -3 harness connectors and ground.

    + − Continuity
    Cooling fan relay
    Connector Terminal

    E42

    (cooling fan relay-2)     		6 Ground Existed

    E41

    (cooling fan relay-3)     		6

  2. Also check harness for short to ground and to power.

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

Repair or replace error-detected parts.

CHECK COOLING FAN MOTOR CIRCUIT-4

  1. Check the continuity between cooling fan motor-2 harness connector and ground.

    + − Continuity
    Cooling fan motor-2
    Connector Terminal
    E237 3 Ground Existed
    4

  2. Also check harness for short to ground and to power.

Is the inspection result normal?

YES>>

GO TO 8.

NO>>

Repair or replace error-detected parts.

CHECK COOLING FAN RELAY-2 AND -3

Refer to Component Inspection (Cooling Fan Relay).

Is the inspection result normal?

YES>>

GO TO 9.

NO>>

Replace malfunctioning cooling fan relay.

CHECK COOLING FAN MOTORS-1 AND -2

Refer to Component Inspection (Cooling Fan Motor).

Is the inspection result normal?

YES>>

GO TO 10.

NO>>

Replace malfunctioning cooling fan motor. Refer to Removal and Installation.

CHECK INTERMITTENT INCIDENT

Perform Intermittent Incident

Is the inspection result normal?

YES>>

Replace IPDM E/R. Refer to Removal and Installation.

NO>>

Repair or replace error-detected parts.

Component Inspection (Cooling Fan Motor)

CHECK COOLING FAN MOTOR

  1. Turn ignition switch OFF.

  2. Disconnect cooling fan motor harness connector.

  3. Supply cooling fan motor terminals with battery voltage and check operation.

    Cooling fan motor Condition
    Terminal
    + –
    1 3 and 4 A
    2 3 and 4
    1 and 2 3
    1 and 2 4
    1, 2 3, 4 B

    Check that cooling fan speed of condition B is higher than that of A.

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace cooling fan motor. Refer to Removal and Installation.

Component Inspection (Cooling Fan Relay)

CHECK COOLING FAN RELAYS

  1. Turn ignition switch OFF.

  2. Remove cooling fan relay-2, -3.

  3. Check the continuity between cooling fan relay-2, -3 terminals as per the following conditions.

    Cooling fan relay-2, -3 Conditions Continuity
    + −
    Terminal
    5 3 12V direct current supply between terminals 1 and 2 Existed
    No current supply Not existed
    7 6 12V direct current supply between terminals 1 and 2 Existed
    No current supply Not existed

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace cooling fan relay.

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