Nissan Altima L32. Manual - part 335

ELECTRICAL LOAD SIGNAL

EC-461

< COMPONENT DIAGNOSIS >

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ELECTRICAL LOAD SIGNAL

Description

INFOID:0000000004349521

The electrical load signal (Headlamp switch signal, rear window defogger switch signal, etc.) is transferred

through the CAN communication line.

Component Function Check

INFOID:0000000004349522

1.

CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION

1. Turn ignition switch ON.

2. Connect CONSULT-III and select “DATA MONITOR” mode.

3. Select “LOAD SIGNAL” and check indication under the following conditions.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

EC-461, "Diagnosis Procedure"

.

2.

CHECK LIGHTING SWITCH FUNCTION

Check “LOAD SIGNAL” indication under the following conditions.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Go to 

EC-461, "Diagnosis Procedure"

.

3.

CHECK HEATER FAN CONTROL SWITCH FUNCTION

Select “HEATER FAN SW” and check indication under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-461, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004349523

1.

INSPECTION START

Confirm the malfunctioning circuit (rear window defogger, headlamp or heater fan). Refer to 

EC-461, "Compo-

nent Function Check"

.

Which circuit is related to the incident?

Rear window defogger>>GO TO 2.

Headlamp>>GO TO 3.

Heater fan>>GO TO 4.

2.

CHECK REAR WINDOW DEFOGGER SYSTEM

Refer to 

DEF-6, "System Diagram"

.

Monitor item

Condition

Indication

LOAD SIGNAL Rear window defogger switch

ON

ON

OFF

OFF

Monitor item

Condition

Indication

LOAD SIGNAL Lighting switch

ON at 2nd position

ON

OFF

OFF

Monitor item

Condition

Indication

HEATER FAN SW

Heater fan control switch

ON

ON

OFF

OFF

EC-462

< COMPONENT DIAGNOSIS >

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ELECTRICAL LOAD SIGNAL

>> INSPECTION END

3.

CHECK HEADLAMP SYSTEM

Refer to 

EXL-7, "System Diagram"

 (XENON TYPE) or 

EXL-9, "System Diagram"

 (HALOGEN TYPE).

>> INSPECTION END

4.

CHECK HEATER FAN CONTROL SYSTEM

Refer to 

HAC-42, "Diagnosis Procedure"

 (automatic air conditioner) or 

HAC-127, "Diagnosis Procedure"

(manual air conditioner).

>> INSPECTION END

FUEL INJECTOR

EC-463

< COMPONENT DIAGNOSIS >

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FUEL INJECTOR

Description

INFOID:0000000004349524

The fuel injector is a small, precise solenoid valve. When the ECM

supplies a ground to the fuel injector circuit, the coil in the fuel injec-

tor is energized. The energized coil pulls the ball valve back and

allows fuel to flow through the fuel injector into the intake manifold.

The amount of fuel injected depends upon the injection pulse dura-

tion. Pulse duration is the length of time the fuel injector remains

open. The ECM controls the injection pulse duration based on

engine fuel needs.

Component Function Check

INFOID:0000000004349525

1.

INSPECTION START

Turn ignition switch to START.
Is any cylinder ignited?

YES

>> GO TO 2.

NO

>> Go to 

EC-463, "Diagnosis Procedure"

.

2.

CHECK FUEL INJECTOR FUNCTION

With CONSULT-III

1. Start engine.

2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.

3. Make sure that each circuit produces a momentary engine speed drop.

Without CONSULT-III

1. Let engine idle.

2. Listen to each fuel injector operating sound.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-463, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004349526

1.

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect fuel injector harness connector.

3. Turn ignition switch ON.

SEF375Z

Clicking noise should be heard.

PBIB1986E

EC-464

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

FUEL INJECTOR

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-464, "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:0000000004349527

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