Nissan Altima 2007-2012 Service Manual: 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 control [HIGH/MIDDLE/LOW/OFF].
COOLING FAN MOTOR
The cooling fan operates at each speed when the current flows in the cooling fan motor as follows.
The cooling fan operates at low (LOW) speed when cooling fan motors-1 and -2 are circuited in series and middle speed condition.
Refer to EC-77, "System Diagram".
Component Function Check
1.CHECK COOLING FAN FUNCTION
1. Turn ignition switch ON.
2. Perform
ASCD indicator
Description
The ASCD operation status is indicated by two indicators, (CRUISE and SET on
the information display) on
the combination meter.
CRUISE indicator is displayed to indicate that ASCD s ...
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 REA ...
Other materials:
BCM branch line circuit
Diagnosis Procedure
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the BCM for damage, bend and loose
connection (unit side and
connector side).
Is the inspec ...
Standardized relay
Description
NORMAL OPEN, NORMAL CLOSED AND MIXED TYPE RELAYS
Relays can mainly be divided into three types: normal open, normal closed and
mixed type relays.
TYPE OF STANDARDIZED RELAYS
...
P1225 TP Sensor
Description
Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has two sensors. These sensors are a
kind of potentiometer which transform the t ...