Infiniti FX35, FX50 (S51). Manual - part 749

 

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Infiniti FX35, FX50 (S51). Manual - part 749

 

 

ECM

EC-537

< ECU DIAGNOSIS INFORMATION >

[VQ35HR]

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Fail-safe

INFOID:0000000005237122

NON DTC RELATED ITEM

JCBWA1515GB

EC-538

< ECU DIAGNOSIS INFORMATION >

[VQ35HR]

ECM

DTC RELATED ITEM

Engine operating condi-

tion 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 illuminating 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 the 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.

EC-486

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.

P0014
P0024

Exhaust valve timing con-
trol

The signal is not energized to the exhaust valve timing control magnet retarder and the 
magnet retarder control does not function.

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 tempera-
ture 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. 

P0196
P0197
P0198

Engine oil temperature 
sensor

Exhaust valve timing control does not function.

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.

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.

ECM

EC-539

< ECU DIAGNOSIS INFORMATION >

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DTC Inspection Priority Chart

INFOID:0000000005237123

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.

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 ac-
tuator

(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 because regulating the throttle opening 
to 20 degrees or less.

(When ECM detects the throttle valve is stuck open:)
While the vehicle is being driven, 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. 

DTC No.

Detected items

Engine operating condition in fail-safe mode

EC-540

< ECU DIAGNOSIS INFORMATION >

[VQ35HR]

ECM

Priority

Detected items (DTC)

1

• U0101 U0164 U1001 CAN communication line
• P0101 P0102 P0103 P010B P010C P010D Mass air flow sensor
• P0112 P0113 P0127 Intake air temperature sensor
• P0116 P0117 P0118 P0125 Engine coolant temperature sensor
• P0122 P0123 P0222 P0223 P0227 P0228 P1225 P1226 P1234 P1235 P1239 P2132 P2133 P2135 Throttle position sensor
• P0128 Thermostat function
• P0181 P0182 P0183 Fuel tank temperature sensor
• P0196 P0197 P0198 Engine oil temperature sensor
• P0327 P0328 P0332 P0333 Knock sensor
• P0335 Crankshaft position sensor
• P0340 P0345 Camshaft position sensor
• P0460 P0461 P0462 P0463 Fuel level sensor
• P0500 Vehicle speed sensor
• P0605 P0607 ECM
• P0643 Sensor power supply
• P0705 P0850 Park/neutral position (PNP) switch
• P1550 P1551 P1552 P1553 P1554 Battery current sensor
• P1610 - P1615 NATS
• P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor

2

• P0031 P0032 P0051 P0052 Air fuel ratio (A/F) sensor 1 heater
• P0037 P0038 P0057 P0058 Heated oxygen sensor 2 heater
• P0075 P0081 Intake valve timing control solenoid valve
• P0078 P0084 Exhaust valve timing control magnet retarder
• P0130 P0131 P0132 P0133 P0150 P0151 P0152 P0153 P2A00 P2A03 Air fuel ratio (A/F) sensor 1
• P0137 P0138 P0139 P0157 P0158 P0159 Heated oxygen sensor 2
• P0441 EVAP control system purge flow monitoring
• P0443 P0444 P0445 EVAP canister purge volume control solenoid valve
• P0447 P0448 EVAP canister vent control valve
• P0451 P0452 P0453 EVAP control system pressure sensor
• P0550 Power steering pressure sensor
• P0603 ECM power supply
• P0710 P0717 P0720 P0731 P0732 P0733 P0734 P0735 P0740 P0744 P0745 P1730 P1752 P1757 P1762 P1767 P1772 

P1774 A/T related sensors, solenoid valves and switches

• P1078 P1084 Exhaust valve timing control position sensor
• P1217 Engine over temperature (OVERHEAT)
• P1233 P2101 Electric throttle control function
• P1236 P2118 Throttle control motor
• P1290 P2100 P2103 Throttle control motor relay
• P1805 Brake switch

3

• P0011 P0021 Intake valve timing control
• P0014 P0024 Exhaust valve timing control
• P0171 P0172 P0174 P0175 Fuel injection system function
• P0300 - P0306 Misfire
• P0420 P0430 Three way catalyst function
• P0442 P0456 EVAP control system (SMALL LEAK, VERY SMALL LEAK)
• P0455 EVAP control system (GROSS LEAK)
• P0506 P0507 Idle speed control system
• P1148 P1168 Closed loop control
• P1211 TCS control unit
• P1212 TCS communication line
• P1238 P2119 Electric throttle control actuator
• P1421 Cold start control
• P1564 ICC steering switch / ASCD steering switch
• P1568 ICC command value
• P1572 ICC brake switch / ASCD brake switch
• P1574 ICC vehicle speed sensor / ASCD vehicle speed sensor

 

 

 

 

 

 

 

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