NON DTC RELATED ITEM

Engine operating condition in fail-safe mode | Detected items | Remarks | Reference page
Engine speed will not rise more than 2,500 rpm due to the fuel cut | Malfunction indicator lamp circuit | When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is malfunction on engine control system. Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the driver to repair the malfunction.
Component Function Check (GT-R certified NISSAN dealer)

DTC RELATED ITEM

DTC No. | Detected items | Engine operating condition in fail-safe mode
P0011 P0021 | Intake valve timing control | The signal is not energized to the intake valve timing control solenoid valve and the valve control does not function.
P004A P004D | Turbocharger boost control solenoid valve | Sets the duty ratio of the turbocharger boost control solenoid valve to 0%, and decreases the boost to the lower limit.
P004C | The ECM controls the electric throttle control actuator and restricts the torque.
P0102 P0103 P010C P010D | Mass air flow sensor circuit | Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0117 P0118 | Engine coolant temperature sensor circuit | Engine coolant temperature will be determined by ECM based on the following condition. CONSULT-III displays the engine coolant temperature decided by ECM.
Condition | Engine coolant temperature decided (CONSULT-III display)
Just as ignition switch is turned ON or START | 40°C (104°F)
Approx. 4 minutes or more after engine starting | 80°C (176°F)
Except as shown above | 40 - 80°C (104 - 176°F) (Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates while engine is running.
P0122 P0123 P0222 P0223 P0227
P0228
P1239
P2132
P2133
P2135
Throttle position sensor
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal condition.
Therefore, the acceleration will be poor.
P0234 P1334 | Turbochager system | The ECM controls the electric throttle control actuator and restricts the torque.
P0236 P0237 P0238 P0240 P0241
P0242
Turbocharger boost sensor
Sets the duty ratio of the turbocharger boost control solenoid valve to 0%, and decreases the boost to the lower limit.
P0500 | Vehicle speed sensor | The cooling fan operates (Highest) while engine is running.
P0605 | ECM | (When ECM calculation function is malfunctioning:) ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. ECM deactivates ASCD operation.
P062A | Sub fuel pump | The ECM controls the electric throttle control actuator and restricts the torque.
P0643 | Sensor power supply | ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P1233 P2101 | Electric throttle control function | ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P1236 P2118 | Throttle control motor | ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P1238 P2119 | Electric throttle control actuator | (When electric throttle control actuator does not function properly due to the return spring malfunction:) ECM controls the electric throttle actuator by regulating the throttle opening around the idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail-safe mode is not in specified range:) ECM controls the electric throttle control actuator by regulating the throttle opening to 20 degrees or less.
(When ECM detects the throttle valve is stuck open:) While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the engine stalls. The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or more.
P1290 P2100 P2103 | Throttle control motor relay | ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P1805 | Brake switch | ECM controls the electric throttle control actuator by regulating the throttle opening to a small range. Therefore, acceleration will be poor.
Vehicle condition | Driving condition
When engine is idling | Normal
When accelerating | Poor acceleration
P2122 P2123 P2127 P2128 P2138
Accelerator pedal position sensor
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal condition.
Therefore, the acceleration will be poor.
P2440 P2442 | Air cut solenoid valve | Engine speed will not rise more than 2,400 rpm due to the fuel cut.