Nissan Altima L32. Instruction — part 591

FUEL INJECTOR

EC-1485

< COMPONENT DIAGNOSIS >

[VQ35DE]

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Component Inspection

INFOID:0000000004362366

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

EC-1486

< COMPONENT DIAGNOSIS >

[VQ35DE]

FUEL PUMP

FUEL PUMP

Description

INFOID:0000000004362367

*: 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:0000000004362368

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

>>

EC-1486, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004362369

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 connectors.

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.

ALBIA0128ZZ

ECM

Voltage

+

–

Connector

Terminal

Connector

Terminal

F14

14

E10

112

Battery voltage

JMBIA1890ZZ

FUEL PUMP

EC-1487

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[VQ35DE]

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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 F10

• 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-1 POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.

3. Disconnect condenser-1 harness connector.

4. Turn ignition switch ON.

5. Check the voltage between condenser-1 harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 5.

5.

CHECK 15A FUSE

1. Turn ignition switch OFF.

2. Disconnect 15 A fuse (No. 32).

3. Check 15 A fuse.
Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace fuse.

6.

CHECK CONDENSER-1 POWER SUPPLY CIRCUIT-II

1. Disconnect IPDM E/R harness connector E18.

2. Check the continuity between IPDM E/R harness connector and condenser-1 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.

IPDM E/R

Ground

Voltage

Connector

Terminal

F10

77

Ground

Battery voltage

JMBIA1885ZZ

Condenser-1

Ground

Voltage (V)

Connector

Terminal

B17

1

Ground

Battery voltage should exist for 1 seconds
after ignition switch is turned ON.

PBIB0624E

IPDM E/R

Condenser-1

Continuity

Connector

Terminal

Connector

Terminal

E18

13

B17

1

Existed

EC-1488

< COMPONENT DIAGNOSIS >

[VQ35DE]

FUEL PUMP

7.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors B10, E29

• IPDM E/R connector E18

• Harness for open or short between IPDM E/R and condenser-1

>> Repair open circuit or short to power in harness or connectors.

8.

CHECK CONDENSER-1 GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check the continuity between condenser-1 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 B10, E29 (with rear view monitor)

• Harness for open or short between condenser-1 and ground

>> Repair open circuit or short to power in harness or connectors.

10.

CHECK CONDENSER-1

Refer to

EC-1489, "Component Inspection (Condenser-1)"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Replace condenser-1.

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 B10, E29

• 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

Condenser-1

Ground

Continuity

Connector

Terminal

B17

2

Ground

Existed

IPDM E/R

Fuel level sensor unit and fuel

pump

Continuity

Connector

Terminal

Connector

Terminal

E18

13

B42

1

Existed