Nissan Frontier D22. Manual - part 831

MTC-46

TROUBLE DIAGNOSIS

11. 

CHECK CIRCUIT CONTINUITY

1.

Disconnect refrigerant pressure sensor harness connector E3.

2.

Check circuit continuity between air control harness connector
M95 terminal 2 (L/Y) and refrigerant pressure sensor connector
E3 terminal 2 (L/Y).

3.

Also check circuit continuity between refrigerant pressure sen-
sor connector E3 terminal 1 (G/R) and ECM connector F29 ter-
minal 21 (G/R).

OK or NG

OK

>> Check ECM. Refer to 

EC-697

  (VG33E) or 

EC-1298

(VG33ER).

NG

>> Repair harness or connector.

12. 

CHECK FUSES

Check 7.5A fuse (No. 29, located in the fuse and fusible link box) and 7.5A fuse (No. 35, located in the fuse
and fusible link box). For fuse layout, refer to 

PG-9, "POWER SUPPLY ROUTING"

 .

Are fuses OK?

YES

>> Check the following.

●

If NG, repair harness or connectors.

–

Harness for open between fuse and fusible link box and A/C relay

NO

>> GO TO 13. 

13. 

REPLACE FUSE

Replace fuse.

Does fuse blow when A/C is activated?

Yes

>> GO TO 14.

No

>> INSPECTION END

Continuity should exist.

WJIA0678E

Continuity should exist.

WJIA0679E

TROUBLE DIAGNOSIS

MTC-47

C

D

E

F

G

H

I

K

L

M

A

B

MTC

14. 

CHECK A/C RELAY POWER SUPPLY CIRCUITS FOR SHORT

1.

Disconnect battery cable and A/C relay.

2.

Check for continuity on A/C relay connector E30 terminals 2 (G/
OR), 5 (Y) to ground.

OK or NG

OK

>> Check the following.

●

If NG, repair harness or connectors.

–

Harness connectors M60, M95 and E30.

–

Harness for open or short between fuse and fusible
link box and A/C relay, or air control.

NG

>> Repair harness or connector.

15. 

CHECK FAN SWITCH

1.

Disconnect fan switch connector M57.

2.

Turn fan control knob to ON (any speed position except OFF).

3.

Check continuity between fan switch terminals 1 and 6.

OK or NG

OK

>> Check the following.

●

If NG, repair harness or connectors.

–

Harness connectors M57 and M95.

–

Harness for open or short between fan switch and air control.

–

If OK, replace air control.

NG

>> Replace fan switch.

ELECTRICAL COMPONENTS INSPECTION
A/C Relay

Check continuity between terminals 3 and 5.

If NG, replace relay.

Continuity should not exist.

WJIA0577E

LHA235

Conditions

Continuity

12V direct current supply between terminals 1 and 2

Yes

No current supply

No

LHA160

MTC-48

TROUBLE DIAGNOSIS

Refrigerant Pressure Sensor

Check continuity between terminals.

Thermal Protector (KA24DE Models)

Thermal Protector (VG33E and VG33ER Models)

Terminals

High-pressure side line 

pressure kPa (kg/cm

2

 , 

psi)

Operation

Continuity

Low-pres-
sure side

1 - 2

Increasing to 157 - 216 

(1.6 - 2.2, 23 - 31)

ON

Yes

Decreasing to 157 - 196 

(1.6 - 2.0, 23 - 28)

OFF

No

High-pres-
sure side

Increasing to 2,648 - 

2,844 (27 - 29, 384 - 412)

OFF

No

Decreasing to 1,373 - 

1,765 (14 - 18, 199 - 256)

ON

Yes

WJIA0680E

Temperature of compressor 

°C (°F)

Operation

Increasing to approx. 145 - 155 (293 - 311)

Turn OFF

Decreasing to approx. 130 - 140 (266 - 284)

Turn ON

AHA135A

Temperature of compressor 

°C (°F)

Operation

Increasing to approx. 145 - 155 (293 - 311)

Turn OFF

Decreasing to approx. 130 - 140 (266 - 284)

Turn ON

AHA402A

TROUBLE DIAGNOSIS

MTC-49

C

D

E

F

G

H

I

K

L

M

A

B

MTC

Insufficient Cooling

EJS0020B

TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT COOLING

Symptom:

●

Insufficient cooling

Inspection Flow

WHA328

*1:

MTC-32

*2:

MTC-53

*3:

MTC-50

*4:

MTC-30

*5:

MTC-22

*6:

MTC-67

*7:

MA-15

 (KA24DE models) or 

MA-24

  

(VG33E and VG33ER models)