Infiniti M45 (Y34). Manual — part 498
REFRIGERANT PRESSURE SENSOR
EC-681
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Wiring Diagram
ABS002U6
TBWA0315E
EC-682
REFRIGERANT PRESSURE SENSOR
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic Procedure
ABS002U7
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 88 and ground with CON-
SULT-II or tester.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
2.
CHECK GROUND CONNECTIONS
1.
Turn A/C switch and blower switch OFF.
2.
Stop engine.
3.
Turn ignition switch OFF.
4.
Loosen and retighten two ground screws.
Refer to
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace ground connections.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
88
P
Refrigerant pressure sensor
[Engine is running]
●
Warm-up condition
●
Both A/C switch and blower switch ON.
(Compressor operates.)
1.0 - 4.0V
89
B
Sensor ground
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
103
L
Sensor power supply
[Ignition switch: ON]
Approximately 5V
Voltage: 1.0 - 4.0V
PBIB0187E
PBIB1118E
REFRIGERANT PRESSURE SENSOR
EC-683
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3.
CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect refrigerant pressure sensor harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between refrigerant pressure sensor terminal 1
and ground with CONSULT-II or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E34, F34
●
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.
5.
CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between refrigerant pressure sensor terminal 3 and ECM terminal 89.
Refer to Wiring Diagram.
4.
Also check harness for short to ground or short to power.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
6.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E34, F34
●
Joint connector-30
●
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.
PBIB1113E
Voltage: Approximately 5V
PBIB0188E
Continuity should exist.
EC-684
REFRIGERANT PRESSURE SENSOR
7.
CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminal 88 and refrigerant pressure sensor terminal 2.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E34, F34
●
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.
9.
REFRIGERANT PRESSURE SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT
1.
Disconnect harness connector E34, F34.
2.
Check harness continuity between harness connector F34 terminal 2 and ground.
Refer to Wiring Diagram.
3.
Also check harness for short to power.
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E34, F34
●
Harness for open or short between harness connector F34 and ground.
>> Repair open circuit or short to power in harness or connectors.
11.
CHECK INTERMITTENT INCIDENT
Refer to
EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
OK or NG
OK
>> Replace refrigerant pressure sensor.
NG
>> Repair or replace.
Removal and Installation
ABS002U8
REFRIGERANT PRESSURE SENSOR
Refer to
ATC-143, "Removal and Installation of Refrigerant Pressure Sensor"
Continuity should exist.
Continuity should exist.
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