Nissan Murano Z51. Instruction — part 608
EC-440
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
FUEL INJECTOR
Component Inspection
INFOID:0000000005536872
1.
CHECK FUEL INJECTOR
1.
Turn ignition switch OFF.
2.
Disconnect fuel injector harness connector.
3.
Check resistance between fuel injector terminals as per the fol-
lowing.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace malfunctioning fuel injector.
Terminals
Resistance
1 and 2
11.1 - 14.5
Ω
[at 10 - 60
°
C (50 - 140
°
F)]
PBIB1727E
FUEL PUMP
EC-441
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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FUEL PUMP
Description
INFOID:0000000005536873
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine
start ability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows
that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when
the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging,
thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.
Component Function Check
INFOID:0000000005536874
1.
CHECK FUEL PUMP FUNCTION
1.
Turn ignition switch ON.
2.
Pinch fuel feed hose with two fingers.
-
: Vehicle front (Illustration shows the view with intake air duct
removed)
Is the inspection result normal?
YES
>> INSPECTION END
NO
>>
.
Diagnosis Procedure
INFOID:0000000005536875
1.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 2.
Sensor
Input signal to ECM
ECM Function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
Fuel pump control
Fuel pump relay
↓
Fuel pump
Battery
Battery voltage*
Condition
Fuel pump operation
Ignition switch is turned to ON.
Operates for 1 second.
Engine running and cranking
Operates.
When engine is stopped
Stops in 1.5 seconds.
Except as shown above
Stops.
Fuel pressure pulsation should be felt on the fuel feed
hose for 1 second after ignition switch is turned ON.
JMBIA1131ZZ
ECM
Voltage
+
–
Connector
Terminal
Connector
Terminal
F7
14
E16
112
Battery voltage
EC-442
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
FUEL PUMP
2.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
Check the voltage between IPDM E/R harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 16.
3.
DETECT MALFUNCTIONING PART
Check the following.
• IPDM E/R harness connector F12
• Harness for open or short between IPDM E/R and ECM
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
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 the voltage between condenser harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 5.
5.
CHECK 15 A FUSE
1.
Turn ignition switch OFF.
2.
Disconnect 15 A fuse (No. 41).
3.
Check 15 A fuse.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace fuse.
6.
CHECK CONDENSER POWER SUPPLY CIRCUIT-II
1.
Disconnect IPDM E/R harness connector.
2.
Check the continuity between IPDM E/R harness connector and condenser harness connector.
3.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
IPDM E/R
Ground
Voltage
Connector
Terminal
F12
77
Ground
Battery voltage
Condenser
Ground
Voltage
Connector
Terminal
B81
1
Ground
Battery voltage should exist for 1 second
after ignition switch is turned ON.
IPDM E/R
Condenser
Continuity
Connector
Terminal
Connector
Terminal
E10
13
B81
1
Existed
FUEL PUMP
EC-443
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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Check the following.
• Harness connectors E104, B4
• IPDM E/R connector E10
• Harness for open or short between IPDM E/R and condenser
>> Repair open circuit or short to power in harness or connectors.
8.
CHECK CONDENSER GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check the continuity between condenser harness connector and ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 9.
9.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B4, E104 (with rear view monitor)
• Harness for open or short between condenser and ground
>> Repair open circuit or short to power in harness or connectors.
10.
CHECK CONDENSER
EC-444, "Component Inspection (Condenser)"
.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Replace condenser.
11.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1.
Disconnect “fuel level sensor unit and fuel pump” harness connector.
2.
Check harness continuity between IPDM E/R harness connector and “fuel level sensor unit and fuel
pump” harness connector.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> GO TO 12.
12.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B4, E104
• Harness for open or short between “fuel level sensor unit and fuel pump” and IPDM E/R
>> Repair open circuit or short to power in harness or connectors.
13.
CHECK FUEL PUMP GROUND CIRCUIT
1.
Disconnect “fuel level sensor unit and fuel pump” harness connector.
2.
Check the continuity between “fuel level sensor unit and fuel pump” harness connector and ground.
Condenser
Ground
Continuity
Connector
Terminal
B81
2
Ground
Existed
IPDM E/R
Fuel level sensor unit and fuel
pump
Continuity
Connector
Terminal
Connector
Terminal
E10
13
B40
1
Existed
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