Nissan Murano: System / Engine Protection Control at Low Engine Oil Pressure
System Description
SYSTEM DIAGRAM

SYSTEM DESCRIPTION
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The engine protection control at low engine oil pressure warns the driver of a decrease in engine oil pressure by the oil pressure warning lamp before the engine becomes damaged.
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When detecting a decrease in engine oil pressure at an engine speed less than 1,000 rpm, ECM transmits an oil pressure warning lamp signal to the combination meter. The combination meter turns ON the oil pressure warning lamp, according to the signal.
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When detecting a decrease in engine oil pressure at an engine speed 1,000 rpm or more, ECM transmits an oil pressure warning lamp signal to the combination meter.
The combination meter turns ON the oil pressure warning lamp, according to the signals. When detecting a decrease in engine oil pressure, ECM cuts fuel if the engine speed exceeds the specified value.
| Decrease in engine oil pressure | Engine speed | Combination meter | Fuel cut |
| Oil pressure warning lamp |
| Detection |
Less than 1,000 rpm |
ON* |
NO |
| 1,000 rpm or more |
ON |
YES |
*: When detecting a normal engine oil pressure, ECM turns OFF the oil pressure warning lamp.
System Description
SYSTEM DIAGRAMINPUT/OUTPUT SIGNAL CHART Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Engine speed and piston position
Exhaust valve timing control
Exhaust valve timing control solenoid valve
Camshaft position sensor (PHASE)
Engine oil temperature sensor
Engine oil temperature
Exhaust valve timing control position sensor
Exhaust valve timing signal
Combination meter
CAN communication
Nissan Murano Vehicle speed signal
SYSTEM DESCRIPTIONThis mechanism hydraulically controls cam phases continuously with the fixed operating angle of the exhaust valve...
System Description
SYSTEM DIAGRAMSYSTEM DESCRIPTIONThe fuel filler cap warning system alerts the driver to the prevention of the fuel filler being left uncapped and malfunction occurrences after refueling, by turning ON the fuel filler cap warning display on the combination meter...
Other information:
DTC Description
DTC DETECTION LOGIC
An excessively low voltage from the APP sensor 1 is sent to ECM.
An excessively high voltage from the APP sensor 1 is sent to ECM.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detection condition
P2122
APP SEN 1/CIRC
(Throttle/Pedal position sensor/switch “D” circuit low)
Diagnosis condition
Start engine and let it idle
Signal (terminal)
Voltage signal transmitted from APP sensor 1 to ECM
Threshold
An excessively low voltage is sent to ECM
Diagnosis delay time
—
P2123
APP SEN 1/CIRC
(Throttle/Pedal position sensor/switch “D” circuit high)
Diagnosis condition
Start engine and let it idle
Signal (terminal)
Voltage signal transmitted from APP sensor 1 to ECM
Threshold
An excessively high voltage is sent to ECM
Diagnosis delay time
—
POSSIBLE CAUSEDTC P2122
Harness or connectors
(APP sensor 1 circuit is open or shorted...
Diagnosis Procedure
Intelligent Key button operation has poor range.SYMPTOM TABLE (BOTH INTELLIGENT KEYS HAVE THE SAME SYMPTOMS) Door lock operation (remote keyless entry) Door lock operation (request switch) or back door open operation (opener switch of back door panel) Engine started with ignition switch operation (registered Intelligent Key is within the detection area of inside key antenna) Engine started with ignition switch operation (registered Intelligent Key placed next to ignition switch)
Poor range
OK
OK
OK
DIAGNOSIS PROCEDURERefer to Diagnosis Procedure...