Nissan Altima 2007-2012 Service Manual: P0643 sensor power supply
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 8V at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 1 second.
2. Check DTC.
Is DTC detected? YES >> Go to EC-867, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-45, "Circuit Inspection".
Is the inspection result normal? YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between APP sensor harness connector and ground.
Is the inspection result normal? YES >> GO TO 7.
NO >> GO TO 3.
3.CHECK SENSOR POWER SUPPLY CIRCUITS
Check harness for short to power and short to ground, between the following terminals.
Is the inspection result normal? YES >> GO TO 4.
NO >> Repair short to ground or short to power in harness or connectors.
4.CHECK COMPONENTS
Check the following.
• Battery current sensor (Refer to EC-885, "Component Inspection".) • Power steering pressure sensor (Refer to EC-860, "Component Inspection".) • Camshaft position sensor (PHASE) (Refer to EC-789, "Component Inspection".) Is the inspection result normal? YES >> GO TO 5.
NO >> Replace malfunctioning component.
5.CHECK TP SENSOR
Refer to EC-716, "Component Inspection".
Is the inspection result normal? YES >> GO TO 9.
NO >> GO TO 6.
6.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator.
2. Go to EC-565, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Requirement".
>> INSPECTION END
7.CHECK APP SENSOR
Refer to EC-926, "Component Inspection".
Is the inspection result normal? YES >> GO TO 9.
NO >> GO TO 8.
8.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Go to EC-926, "Special Repair Requirement".
>> INSPECTION END
9.CHECK INTERMITTENT INCIDENT
Refer to GI-42, "Intermittent Incident".
>> INSPECTION END
P0607 ECM
Description CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excelle ...P0850 PNP Switch
Description When the shift lever position is P or N (CVT), Neutral position (M/T), park/neutral position (PNP) switch is ON. ECM detects the position because the continuity of the line (the ON ...Other materials:
P0740 torque converter clutch solenoid
valve
Description
• The torque converter clutch solenoid valve is activated by the TCM in
response to signals sent from the vehicle
speed and accelerator pedal position sensors. Lock-up piston operation will then
be controlled.
• Lock-up operation, however, is prohibited when CVT fluid tempe ...
Heater operation
Heating
This mode is used to direct heated air to the foot
outlets. Some air also flows from the defrost
outlets and the side vent outlets.
1. Press the button to the OFF
position
for normal heating.
2. Press the air flow control
button.
3. Turn the fan control dial to the desired ...
P0125 ECT sensor
Description
The engine coolant temperature sensor is used to detect the engine
coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change i ...