Nissan Pathfinder (2007 year). Manual — part 327

TROUBLE DIAGNOSIS

MTC-63

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MTC

2007 Pathfinder

Front Blower Motor

Confirm smooth rotation of the blower motor.

●

Ensure that there are no foreign particles inside the blower unit.

●

Apply 12 volts to terminal 2 and ground to terminal 1 and verify
that the motor operates freely and quietly.

Front Blower Switch

Check continuity between terminals at each switch position.

WJIA1508E

WJIA0508E

MTC-64

TROUBLE DIAGNOSIS

2007 Pathfinder

Magnet Clutch Circuit

EJS004RR

SYMPTOM: Magnet clutch does not engage.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH

1.

Rotate blower control dial clockwise.

2.

Rotate mode dial to vent (

) position.

3.

Press A/C switch. Confirm that the compressor clutch engages (sound or visual inspection).

Can the symptom be duplicated?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FOR ANY SYMPTOMS

Perform a complete operational check for any symptoms. Refer to

ATC-52, "Operational Check (Front)"

.

Does another symptom exist?

YES

>> Refer to

ATC-34, "SYMPTOM TABLE"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

CHECK INTAKE SENSOR

Check and verify intake sensor circuit. Refer to

ATC-129, "Intake Sensor Circuit"

.

>> GO TO 5.

5.

RECHECK FOR ANY SYMPTOMS

Perform a complete operational check for any symptoms. Refer to

ATC-52, "Operational Check (Front)"

.

Does another symptom exist?

YES

>> Refer to

ATC-34, "SYMPTOM TABLE"

.

NO

>> Replace front air control. Refer to

ATC-131, "FRONT AIR CONTROL"

.

TROUBLE DIAGNOSIS

MTC-65

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MTC

2007 Pathfinder

SYSTEM DESCRIPTION

The front air control controls compressor operation based on ambient and intake temperature and a signal
from ECM.

Low Temperature Protection Control

The front air control will turn the compressor ON or OFF as determined by a signal detected by the intake sen-
sor and the ambient sensor.
When intake air temperature is higher than 3.5

°

C (38.3

°

F), the compressor turns ON. The compressor turns

OFF when intake air temperature is lower than 2.5

°

C (36.5

°

F).

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

1.

PERFORM AUTO ACTIVE TEST

Refer to

PG-23, "Auto Active Test"

.

Does magnet clutch operate?

YES or NO

YES

>>

●

WITH CONSULT-II

GO TO 2.

●

WITHOUT CONSULT-II

GO TO 8.

NO

>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 12.

2.

CHECK BCM INPUT (A/C COMPRESSOR ON) SIGNAL

Check A/C compressor ON/OFF signal. Refer to

MTC-29, "CON-

SULT-II Function (BCM)"

.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 8.

WJIA1490E

A/C SW ON

: COMP ON SIG ON

A/C SW OFF

: COMP ON SIG OFF

WJIA0469E

MTC-66

TROUBLE DIAGNOSIS

2007 Pathfinder

3.

CHECK REFRIGERANT PRESSURE SENSOR

Check refrigerant pressure sensor. Refer to

EC-656, "REFRIGERANT PRESSURE SENSOR"

.

OK or NG

OK

>> GO TO 4.

NG

>> Replace refrigerant pressure sensor. Refer to

EC-660, "Removal and Installation"

.

4.

CHECK BCM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal. Refer to

MTC-29, "CONSULT-II Func-

tion (BCM)"

.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 5.

5.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector and front air control connector.

3.

Check continuity between BCM harness connector M18 (A) ter-
minal 28 and front air control harness connector M49 (B) termi-
nal 18.

OK or NG

OK

>> GO TO 6.

NG

>> Repair harness or connector.

BLOWER CONTROL DIAL
ON

: FAN ON SIG ON

BLOWER CONTROL DIAL
OFF

: FAN ON SIG OFF

WJIA0469E

A

B

Connector

Terminal Connector

Terminal

Continuity

BCM: M18

28

Front air control:

M49

18

Yes

WJIA1627E

TROUBLE DIAGNOSIS

MTC-67

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MTC

2007 Pathfinder

6.

CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)

1.

Reconnect BCM connector and front air control connector.

2.

Turn ignition switch ON.

3.

Turn A/C switch ON.

4.

Check voltage between front air control harness connector M49
terminal 18 and ground.

OK or NG

OK

>> Replace BCM. Refer to

BCS-25, "Removal and Installation"

.

NG-1

>> If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to

MTC-83,

"CONTROL UNIT"

.

NG-2

>> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to

BCS-25, "Removal

and Installation"

.

7.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to

LAN-7, "TROUBLE DIAGNOSIS"

.

OK or NG

OK

>> Inspection End.

NG

>> Repair or replace malfunctioning part(s).

8.

CHECK VOLTAGE FOR FRONT AIR CONTROL (A/C COMPRESSOR ON SIGNAL)

1.

Reconnect BCM connector and front air control connector.

2.

Turn ignition switch ON.

3.

Check voltage between front air control harness connector M49
terminal 10 and ground.

OK or NG

OK

>> GO TO 9.

NG-1

>> If the voltage is approx. 5V when A/C switch is ON, replace front air control. Refer to

MTC-83,

"CONTROL UNIT"

.

NG-2

>> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to

BCS-25, "Removal

and Installation"

.

Terminals

Condition

Voltage

(Approx.)

(+)

(-)

Front air con-

trol connector

Terminal No.

M49

18

Ground

A/C switch: ON
Blower motor
operates

0V

A/C switch: OFF

5V

WJIA1628E

Terminals

Condition

Voltage

(Approx.)

(+)

(-)

Front air

control con-

nector

Terminal No.

M49

10

Ground

A/C switch: ON

0V

A/C switch:

OFF

Battery voltage

WJIA1137E

MTC-68

TROUBLE DIAGNOSIS

2007 Pathfinder

9.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL

1.

Disconnect BCM connector and front air control connector.

2.

Check continuity between BCM harness connector M18 terminal
27 and front air control harness connector M49 terminal 10.

OK or NG

OK

>> GO TO 10.

NG

>> Repair harness or connector.

10.

CHECK INTAKE SENSOR CIRCUITS

Check intake sensor. Refer to

MTC-81, "Intake Sensor Circuit"

.

OK or NG

OK

>> GO TO 11.

NG

>> Replace intake sensor. Refer to

MTC-84, "INTAKE SENSOR"

.

11.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to

LAN-7, "TROUBLE DIAGNOSIS"

.

OK or NG

OK

>> Replace BCM. Refer to

BCS-25, "Removal and Installation"

.

NG

>> Repair or replace malfunctioning part(s).

12.

CHECK MAGNET CLUTCH CIRCUIT

Check for operation sound when applying battery voltage to terminal.

OK or NG

OK

>> GO TO 13.

NG

>> Replace magnet clutch. Refer to

MTC-103, "Removal

and Installation for Compressor Clutch"

.

13.

CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND A/C COMPRESSOR

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R connector and A/C compressor (magnet
clutch) connector.

3.

Check continuity between IPDM E/R harness connector E119
terminal 11 and A/C compressor harness connector F3 terminal
1.

OK or NG

OK

>> Replace IPDM E/R. Refer to

PG-32, "Removal and

Installation of IPDM E/R"

.

NG

>> Repair harness or connector.

27 - 10

: Continuity should exist.

WJIA1136E

WJIA1472E

11 – 1

: Continuity should exist.

WJIA1470E

TROUBLE DIAGNOSIS

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MTC

2007 Pathfinder

Insufficient Cooling

EJS004RS

SYMPTOM: Insufficient cooling

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE

1.

Turn temperature control dial counterclockwise to maximum cold.

2.

Check for cold air at discharge air outlets.

Can the symptom be duplicated?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FOR ANY SYMPTOMS

Perform a complete operational check for any symptoms. Refer to

ATC-52, "Operational Check (Front)"

.

Does another symptom exist?

YES

>> Refer to

ATC-34, "SYMPTOM TABLE"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

CHECK DRIVE BELTS

Check compressor belt tension. Refer to

EM-14, "Checking Drive Belts"

.

OK or NG

OK

>> GO TO 5.

NG

>> Adjust or replace compressor belt. Refer to

EM-14, "DRIVE BELTS"

.

5.

CHECK AIR MIX DOOR OPERATION

Check and verify air mix door mechanism for smooth operation.

Does air mix door operate correctly?

YES

>> GO TO 6.

NO

>> Repair or replace air mix door control linkage.

6.

CHECK COOLING FAN MOTOR OPERATION

Check and verify cooling fan motor for smooth operation. Refer to

EC-488, "Description"

.

Does cooling fan motor operate correctly?

YES

>> GO TO 7.

NO

>> Check cooling fan motor. Refer to

EC-488, "DTC P1217 ENGINE OVER TEMPERATURE"

.

7.

CHECK RECOVERY/RECYCLING EQUIPMENT BEFORE USAGE

Check recovery/recycling equipment before connecting to vehicle. Verify there is no pressure in the recovery/
recycling equipment by checking the gauges. If pressure exists, recover refrigerant from equipment lines.

>> GO TO 8.

MTC-70

TROUBLE DIAGNOSIS

2007 Pathfinder

8.

CHECK REFRIGERANT PURITY

1.

Connect recovery/recycling equipment to vehicle.

2.

Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier.

OK or NG

OK

>> GO TO 9.

NG

>> Check contaminated refrigerant. Refer to

ATC-5, "Contaminated Refrigerant"

.

9.

CHECK FOR EVAPORATOR FREEZE UP

Start engine and run A/C. Check for evaporator freeze up.

Does evaporator freeze up?

YES

>> Perform performance test diagnoses. Refer to

ATC-105, "PERFORMANCE TEST DIAGNOSES"

.

NO

>> GO TO 10.

10.

CHECK REFRIGERANT PRESSURE

Check refrigerant pressure with manifold gauge connected. Refer to

ATC-107, "Test Reading"

.

OK or NG

OK

>> Perform performance test diagnoses. Refer to

ATC-105, "PERFORMANCE TEST DIAGNOSES"

.

NG

>> GO TO 11.

11.

CHECK AIR DUCTS

Check ducts for air leaks.

OK or NG

OK

>> System OK.

NG

>> Repair air leaks.