Nissan Frontier D22. Instruction — part 830

MTC-42

TROUBLE DIAGNOSIS

Magnet Clutch

EJS0020A

TROUBLE DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH

Symptom:

●

Magnet clutch does not engage when A/C switch and fan switch are ON.

Inspection Flow

WHA327

*1:

MTC-70

*2:

MTC-72

*3:

MTC-43

*4:

MTC-30

*5:

MTC-22

*6:

MA-15

(KA24DE models) or

MA-24

(VG33E and VG33ER models)

TROUBLE DIAGNOSIS

MTC-43

C

D

E

F

G

H

I

K

L

M

A

B

MTC

MAGNET CLUTCH CIRCUIT

SYMPTOM:

●

Magnet clutch does not engage when A/C switch and fan switch are ON.

1.

CHECK A/C COMPRESSOR POWER SUPPLY CIRCUIT

1.

Disconnect A/C compressor harness connector F15.

2.

Press the A/C switch ON.

3.

Do approx. 12 volts exist between A/C compressor connector F15 terminal 1 (G/B) and ground?

Yes or No

Yes

>> GO TO 2.

No

>> GO TO 3.

2.

CHECK A/C COMPRESSOR GROUND

Check continuity between A/C compressor connector F15 terminal 1
(B) and ground.

OK or NG

OK

>> Refer to

MTC-42, "TROUBLE DIAGNOSIS PROCE-

DURE FOR MAGNET CLUTCH"

.

NG

>>

●

Check thermal protector. Refer to

MTC-48, "Thermal

Protector (KA24DE Models)"

or

MTC-48, "Thermal

Protector (VG33E and VG33ER Models)"

.

●

Check magnet clutch coil.
If NG, replace magnet clutch. Refer to

MTC-68,

"Removal and Installation for Compressor Clutch"

.

3.

CHECK CIRCUIT CONTINUITY

1.

Disconnect A/C relay.

2.

Check circuit continuity between A/C relay connector E30 termi-
nal 3 (G/B) and A/C compressor connector F15 terminal 1 (G/
B).

3.

Also, check harness for short.

OK or NG

OK

>> GO TO 4.

NG

>> Repair harness or connector.

WHA232

Continuity should exist.

LJIA0004E

Continuity should exist.

WJIA0575E

MTC-44

TROUBLE DIAGNOSIS

4.

CHECK INTAKE SENSOR CIRCUIT

Refer to

MTC-60, "Intake Sensor"

.

OK or NG

OK

>> GO TO 5.

NG

>> Repair as necessary.

5.

CHECK A/C RELAY POWER SUPPLY CIRCUIT

1.

Disconnect A/C relay.

2.

Do approx. 12 volts exist between A/C relay connector E30 ter-
minals 2 (G/OR), 5 (Y) and ground?

Yes or No

Yes

>> GO TO 6.

No

>> GO TO 12.

6.

CHECK A/C RELAY

Refer to

MTC-47, "A/C Relay"

.

OK or NG

OK

>> GO TO 7.

NG

>> Replace A/C relay.

7.

CHECK A/C RELAY GROUND CONTROL CIRCUIT

1.

Reconnect A/C relay.

2.

Engine running and A/C OFF.

3.

Do approx. 12 volts exist between ECM harness connector F29 terminal 12 (P) and ground?

Yes or No

Yes

>> GO TO 8.

No

>> Check the following. If NG, repair harness or connectors.

●

Harness for open or short between A/C relay and ECM

WJIA0576E

WHA307

TROUBLE DIAGNOSIS

MTC-45

C

D

E

F

G

H

I

K

L

M

A

B

MTC

8.

CHECK ECM OUTPUT VOLTAGE

Do approx. 5 volts exist between air control harness connector M95
terminal 2 (L/Y) and ground?

Yes or No

Yes

>> GO TO 15.

No

>> GO TO 8.

9.

CHECK CIRCUIT CONTINUITY

1.

Disconnect refrigerant pressure sensor harness connector E3.

2.

Check voltage from refrigerant pressure sensor E3 terminal 1
(G/R) to ground.

3.

Also, check harness for short.

Yes or No

Yes

>> GO TO 10.

No

>> Repair harness or connector.

10.

CHECK REFRIGERANT PRESSURE SENSOR

Refer to

MTC-48, "Refrigerant Pressure Sensor"

.

OK or NG

OK

>> GO TO 11.

NG

>> Replace refrigerant pressure sensor.

LJIA0006E

Do approx. 5 volts exist?

WJIA0677E