Infiniti I35 (A33). Manual — part 344
SEC084D
Description
NHEC0636
The refrigerant pressure sensor is installed at the liquid tank of the
air conditioner system. The sensor uses an electrostatic volume
pressure transducer to convert refrigerant pressure to voltage. The
voltage signal is sent to ECM, and ECM controls cooling fan sys-
tem.
SEF099XA
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REFRIGERANT PRESSURE SENSOR
Description
EC-717
Wiring Diagram
NHEC0637
MEC649E
SEF643XG
REFRIGERANT PRESSURE SENSOR
Wiring Diagram
EC-718
Diagnostic Procedure
NHEC0638
1
CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION
1. Start engine and warm it up to normal operating temperature.
2. Turn A/C switch and blower switch ON.
3. Check voltage between ECM terminal 81 and ground with CONSULT-II or tester.
SEF617XA
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 2.
2
CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn A/C switch and blower switch OFF.
2. Stop engine.
3. Disconnect refrigerant pressure sensor harness connector.
SEC084D
4. Turn ignition switch ON.
5. Check voltage between refrigerant pressure sensor terminal 1 and ground with CONSULT-II or tester.
SEF618X
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 3.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REFRIGERANT PRESSURE SENSOR
Diagnostic Procedure
EC-719
3
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors E15, F18
I
Harness for open or short between ECM and refrigerant pressure sensor
©
Repair harness or connectors.
4
CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect TCM harness connector.
4. Check harness continuity between refrigerant pressure sensor terminal 3 and ECM terminal 58, TCM terminal 42. Refer
to Wiring Diagram.
Continuity should exist.
5. Also check harness for short to power.
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 5.
5
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors E8, F17
I
Harness for open between ECM and refrigerant pressure sensor
I
Harness for open between TCM (Transmission control module) and refrigerant pressure sensor
©
Repair open circuit or short to power in harness or connectors.
6
CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 81 and refrigerant pressure sensor terminal 2. Refer to Wiring Dia-
gram.
Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 8.
NG
©
GO TO 7.
7
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors E8, F17
I
Harness for open or short between ECM and refrigerant pressure sensor
©
Repair open circuit or short to ground or short to power in harness or connectors.
8
CHECK REFRIGERANT PRESSURE SENSOR
Refer to HA-14, “Refrigerant pressure sensor”.
OK or NG
OK
©
GO TO 9.
NG
©
Replace refrigerant pressure sensor.
REFRIGERANT PRESSURE SENSOR
Diagnostic Procedure (Cont’d)
EC-720
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