Nissan Altima L32. Manual - part 459

FUEL INJECTOR

EC-957

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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4. Check the voltage between fuel injector harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.

• IPDM E/R harness connector F10

• 10A fuse (No. 35)

• Harness for open or short between fuel injector and fuse

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

3.

CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between fuel injector harness connector and ECM harness connector.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 4.

NO

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

4.

CHECK FUEL INJECTOR

Refer to 

EC-957, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace malfunctioning fuel injector.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

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

Component Inspection

INFOID:0000000004349951

1.

CHECK FUEL INJECTOR

1. Turn ignition switch OFF.

Fuel injector

Ground

Voltage

Cylinder

Connector

Terminal

1

F17

1

Ground

Battery voltage

2

F18

1

3

F19

1

4

F20

1

JMBIA1636ZZ

Fuel injector

ECM

Continuity

Cylinder

Connector

Terminal

Connector

Terminal

1

F17

2

F14

32

Existed

2

F18

2

31

3

F19

2

30

4

F20

2

29

EC-958

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

FUEL INJECTOR

2. Disconnect fuel injector harness connector.

3. Check resistance between fuel injector terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace malfunctioning fuel injector.

Terminals

Resistance

1 and 2

10.4 - 15.3

Ω [at 10 -60°C (50 - 140°F)]

JMBIA1637ZZ

FUEL PUMP

EC-959

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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FUEL PUMP

Description

INFOID:0000000004349952

*: 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:0000000004349953

1.

CHECK FUEL PUMP FUNCTION

1. Turn ignition switch ON.

2. Pinch fuel feed hose (2) with two fingers.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>>

EC-959, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004349954

1.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Turn ignition switch ON.

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.

1

: Air cleaner assembly

: Vehicle front

Fuel pressure pulsation should be felt on the fuel feed 
hose for 1 second after ignition switch is turned ON.

ALBIA0080ZZ

EC-960

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

FUEL PUMP

4. Check the voltage between ECM harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

2.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

1. Turn ignition switch OFF.

2. Disconnect IDPDM E/R harness connector F10.

3. Check the continuity between IPDM E/R harness connector and ECM harness connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

3.

CHECK CONDENSER-1 POWER SUPPLY CIRCUIT-I

1. Reconnect all harness connectors disconnected.

2. Disconnect condenser-1 harness connector.

3. Turn ignition switch ON.

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

ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK 15A FUSE

1. Turn ignition switch OFF.

2. Disconnect 15A fuse (No. 32) from IPDM E/R.

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

YES

>> GO TO 6.

NO

>> Replace fuse.

5.

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.

ECM

Ground

Voltage

Connector

Terminal

F14

14

Ground

Battery voltage

PBIB3605E

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

F14

14

F10

77

Existed

Condenser-1

Ground

Voltage

Connector

Terminal

B17

1

Ground

Battery voltage should exist for 1 sec-
ond after ignition switch is turned ON.

PBIB0624E

IPDM E/R

Condenser-I

Continuity

Connector

Terminal

Connector

Terminal

F18

13

B17

1

Existed