INFINITI M35 2006 Factory Service Manual

EC-1428
[VK45DE]
FUEL PUMP
Revision: 2006 January2006 M35/M45
Wiring DiagramNBS005Q3
TBWT1066E

FUEL PUMP
EC-1429
[VK45DE]
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Revision: 2006 January2006 M35/M45
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 ProcedureNBS005Q4
1. CHECK OVERALL FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose (1) with two fingers.
Fuel pressure pulsation should be felt on the fuel feed hose
for 1 second after ignition switch is turned ON.
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
2. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Turn ignition switch ON.
4. Check voltage between ECM terminal 113 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 3.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
38 G/RFuel pump control module
(FPCM) check[When cranking engine]Approximately 0V
[Engine is running]
Warm-up condition
Idle speed4 - 6V
39 B/RFuel pump control module
(FPCM)[When cranking engine]0 - 0.5V
[Engine is running]
Warm-up condition
Idle speed8 - 12V
113 GR Fuel pump relay[Ignition switch: ON]
For 1 second after turning ignition switch ON
[Engine is running]0 - 1.5V
[Ignition switch: ON]
More than 1 second after turning ignition
switch ONBATTERY VOLTAGE
(11 - 14V)
PBIB2721E
Voltage: Battery voltage
PBIB1187E

EC-1430
[VK45DE]
FUEL PUMP
Revision: 2006 January2006 M35/M45
3. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
Check voltage between IPDM E/R terminal 40 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 15.
4. DETECT MALFUNCTIONING PART
Check the following.
Harness connectors E108, M15
Harness for open or short between IPDM E/R and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK CONDENSER POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect condenser harness connector.
4. Turn ignition switch ON.
5. Check voltage between condenser terminal 1 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 9.
NG >> GO TO 6.
6. CHECK 15A FUSE
1. Turn ignition switch OFF.
2. Disconnect 15A fuse.
3. Check 15A fuse.
OK or NG
OK >> GO TO 7.
NG >> Replace fuse.Voltage: Battery voltage
PBIB1926E
Voltage: Battery voltage should exist for 1 second
after ignition switch is turned ON.
PBIB0624E

FUEL PUMP
EC-1431
[VK45DE]
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Revision: 2006 January2006 M35/M45
7. CHECK CONDENSER POWER SUPPLY CIRCUIT-II
1. Disconnect IPDM E/R harness connector E8.
2. Check harness continuity between IPDM E/R terminal 39 and condenser terminal 1.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 15.
NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART
Check the following.
Harness connectors E106, B4
IPDM E/R connector E8
Harness for open or short between IPDM E/R and condenser
>> Repair open circuit or short to power in harness or connectors.
9. CHECK CONDENSER GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect dropping resistor harness connector.
3. Check harness continuity between condenser terminal 2 and dropping resistor terminal 2.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 10.
NG >> Repair open circuit or short to power in harness or connectors.
10. CHECK CONDENSER
Refer to EC-1433, "
Component Inspection" .
OK or NG
OK >> GO TO 11.
NG >> Replace condenser.Continuity should exist.
: Vehicle front 1. FPCM 2. Dropping resistor
Continuity should exist.
PBIB2708E

EC-1432
[VK45DE]
FUEL PUMP
Revision: 2006 January2006 M35/M45
11 . CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Disconnect harness connectors E106, B4.
3. Disconnect “fuel level sensor unit and fuel pump” harness con-
nector (1).
–Illustration shows the view with rear seat cushion and inspection
hole cover (RH) removed.
–: Vehicle front
4. Check harness continuity between the following;
harness connector B4 terminal 4 and “fuel level sensor unit and fuel pump” terminal 1,
“fuel level sensor unit and fuel pump” terminal 3 and dropping resistor terminal 2,
dropping resister terminal 1 and ground.
Refer to Wiring Diagram.
OK or NG
OK >> GO TO 13.
NG >> GO TO 12.
12. DETECT MALFUNCTIONING PART
Check the following.
Harness connector B4
Harness connectors B64, B162
Harness for open or short between “fuel level sensor unit and fuel pump” and harness connector B4
Harness for open or short between “fuel level sensor unit and fuel pump” and dropping resistor
Harness for open or short between dropping resistor and ground
>> Repair open circuit or short to power in harness or connectors.
13. CHECK DROPPING RESISTOR
Refer to EC-1433, "
Component Inspection" .
OK or NG
OK >> GO TO 14.
NG >> Replace dropping resistor.
14. CHECK FUEL PUMP
Refer to EC-1433, "
Component Inspection" .
OK or NG
OK >> GO TO 15.
NG >> Replace fuel pump.
PBIB2706E
Continuity should exist.

FUEL PUMP
EC-1433
[VK45DE]
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Revision: 2006 January2006 M35/M45
15. CHECK INTERMITTENT INCIDENT
Refer to EC-878, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK >> Replace IPDM E/R.
NG >> Repair or replace harness or connectors.
Component InspectionNBS005Q5
FUEL PUMP
1. Turn ignition switch OFF.
2. Disconnect “fuel level sensor unit and fuel pump” harness connector.
3. Check resistance between “fuel level sensor unit and fuel pump”
terminals 1 and 3.
DROPPING RESISTOR
1. Turn ignition switch OFF.
2. Disconnect dropping resistor harness connector.
3. Check resistance between dropping resistor terminals 1 and 2.
CONDENSER
1. Turn ignition switch OFF.
2. Disconnect condenser harness connector.
3. Check resistance between condenser terminals 1 and 2.
Removal and InstallationNBS005Q6
FUEL PUMP
Refer to FL-4, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" . Resistance: 0.2 - 5.0
[at 25C (77F)]
SEC918C
Resistance: Approximately 0.9 [at 20C (68F)]
PBIB0100E
Resistance: Above 1 M at 25C (77F)
PBIB0794E

EC-1434
[VK45DE]
REFRIGERANT PRESSURE SENSOR
Revision: 2006 January2006 M35/M45
REFRIGERANT PRESSURE SENSORPFP:92136
Component DescriptionNBS005Q7
The refrigerant pressure sensor (1) 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 system.
PBIA9537J
PBIB2657E

REFRIGERANT PRESSURE SENSOR
EC-1435
[VK45DE]
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Revision: 2006 January2006 M35/M45
Wiring DiagramNBS005Q8
TBWT1067E

EC-1436
[VK45DE]
REFRIGERANT PRESSURE SENSOR
Revision: 2006 January2006 M35/M45
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 ProcedureNBS005Q9
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 70 and ground with CON-
SULT-II or tester.
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
49 B/YSensor power supply
(Refrigerant pressure sen-
sor, Battery current sensor)[Ignition switch: ON]Approximately 5V
67 B/WSensor ground
(MAF sensor, IAT sensor,
ECT sensor, EVAP control
system pressure sensor,
PSP sensor, ASCD/ICC
steering switch, Battery cur-
rent sensor, Refrigerant
pressure sensor)[Engine is running]
Warm-up condition
Idle speedApproximately 0V
70 L/R Refrigerant pressure sensor[Engine is running]
Warm-up condition
Both A/C switch and blower fan motor
switch: ON (Compressor operates)1.0 - 4.0V
Voltage: 1.0 - 4.0V
PBIB1188E

REFRIGERANT PRESSURE SENSOR
EC-1437
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Revision: 2006 January2006 M35/M45
2. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body.
Refer to EC-885, "
Ground Inspection" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace ground connections.
3. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect refrigerant pressure sensor (1) 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 E11, F2
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.
1. Body ground M70 2. Body ground M16
PBIB2782E
PBIA9537J
Voltage: Approximately 5V
PBIB0188E