Nissan Frontier D22. Instruction — 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
(VG33E) or
(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
.
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:
*2:
*3:
*4:
*5:
*6:
*7:
(KA24DE models) or
(VG33E and VG33ER models)
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