Nissan Altima 2007-2012 Service Manual: Electrical load signal
Description
The electrical load signal (Headlamp switch signal, rear window defogger switch signal, etc.) is transferred through the CAN communication line.
Component Function Check
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-954, "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-954, "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-954, "Diagnosis Procedure".
Diagnosis Procedure
1.INSPECTION START
Confirm the malfunctioning circuit (rear window defogger, headlamp or heater fan). Refer to EC-954, "Component 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".
>> 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
Cooling fan
Description
The ECM controls the cooling fan corresponding to the vehicle speed, engine
colant temperature, refrigerant
pressure, and air conditioner ON signal. The control system has 4-step cont ...
Fuel injector
Description
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 injector
is energized. The energized coil pulls ...
Other materials:
U1000 Can comm circuit
Description
Refer to AV-240, "System Description".
DTC Logic
DTC DETECTION LOGIC
Diagnosis Procedure
Symptom: Displays “CAN COMM CIRCUIT [U1000]” as a self-diagnosis result of AV
control unit.
1.CHECK CAN COMMUNICATION
Select “SELF-DIAG RESULTS” mode for “MULTI AV” w ...
Air breather hose
Exploded View
1. Air breather hose
2. Clip
3. Bracket
4. Air breather tube
5. CVT assembly
A. Paint mark
Removal and Installation
Refer to the figure for removal and installation.
CAUTION:
• Install air breather hose with paint mark facing upward.
• Insert air breather hose a m ...
B260F engine status
Description
BCM receives the engine status signal from ECM via CAN communication.
DTC Logic
DTC DETECTION LOGIC
NOTE:
• If DTC B260F is displayed with DTC U1000, first perform the trouble diagnosis
for DTC U1000. Refer to
SEC-235, "DTC Logic".
• If DTC B260F is displayed w ...