Nissan X-Trail 32. Instruction - part 846

ECM

EC-513

< ECU DIAGNOSIS INFORMATION >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Fail Safe

INFOID:0000000010986262

NON DTC RELATED ITEM

117
(W)

128

(BR)

PNP signal

Input

[Ignition switch: ON]
• Selector lever: P or N

Battery voltage

(11 - 14 V)

[Ignition switch: ON]
• Selector lever: Except above

0 V

118

(SB)

—

Sensor power supply
(Accelerator pedal posi-
tion sensor 2)

—

[Ignition switch: ON]

5.0 V

119

(Y)

120

(LG)

Accelerator pedal posi-
tion sensor 2

Input

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully released

0.25 - 0.5 V

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully depressed

2.0 - 2.5 V

120

(LG)

—

Sensor ground
(Accelerator pedal posi-
tion sensor 2)

—

—

—

121

(BR)

128

(BR)

Power supply for ECM

Input

[Ignition switch: ON]

Battery voltage

(11 - 14 V)

122

(V)

—

Sensor power supply
(Accelerator pedal posi-
tion sensor 1)

—

[Ignition switch: ON]

5.0 V

123

(BR)

—

ECM ground

—

—

—

124
(W)

—

Sensor ground
(Refrigerant pressure 
sensor)

—

—

—

126

(GR)

127

(R)

Accelerator pedal posi-
tion sensor 1

Input

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully released

0.5 - 1.0 V

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully depressed

4.2 - 4.8 V

127

(R)

—

Sensor ground
(Accelerator pedal posi-
tion sensor 1)

—

—

—

128

(BR)

—

ECM ground

—

—

—

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

−

Signal name

Input/

Output

EC-514

< ECU DIAGNOSIS INFORMATION >

[QR25DE]

ECM

DTC RELATED ITEM

Description

When a DTC is detected, ECM executes a mode (in the Fail-safe mode) applicable to the DTC. The fail-safe
mode has the preset traveling control mode (accelerator angle variation and engine output limit) and device fix
mode.

Fail Safe Pattern

Fail Safe List

×

:Applicable —: Not applicable

Detected 

items

Engine operating condition 

in fail-safe mode

Remarks

Reference page

Malfunction 
indicator 
lamp circuit

Engine speed will not rise 
more than 2,500 rpm due 
to the fuel cut

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.

EC-791, "Compo-

nent Function 

Check"

Fail safe mode

Vehicle behavior

Traveling con-
trol mode

Accelerator an-
gle variation 
control

ECM controls the accelerator pedal depression speed to make it slower than actual speed. This 
causes a drop in accelerating performance and encourages the driver to repair malfunction.
NOTE:
ECM does not control the accelerator pedal releasing speed.

Engine output 
control

ECM reduces the engine output, according to the rise in engine speed. This reduces the vehicle 
speed to encourage the driver to repair malfunction.

Device fix mode

• This mode fixes the IVT control solenoid valve and the EVT control solenoid valve in the refer-

ence position.

• The intake manifold runner control valve motor is turned OFF (intake manifold runner control 

valve opens).

Pattern

Fail safe mode

A

Traveling control mode

Accelerator angle variation control

B

Engine output control

C

Device fix mode

DTC 

No.

Detected items

Vehicle behavior

Pattern

Others

A

B

C

P0011

Intake valve timing control

—

—

×

ECM activates the IVT intermediate lock control solenoid 
valve to bring the cam sprocket into an intermediate lock con-
dition.

P0014
P0078

Exhaust valve timing control

—

—

×

—

P0102
P0103

Mass air flow sensor circuit

×

×

×

—

P0122
P0123
P0222
P0223
P2135

Throttle position sensor

—

—

—

The ECM controls the electric throttle control actuator in reg-
ulating 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.
So, the acceleration will be poor. 

ECM

EC-515

< ECU DIAGNOSIS INFORMATION >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

DTC Inspection Priority Chart

INFOID:0000000010986263

P0171
P0172

Fuel injection system

×

—

—

—

P0197
P0198

Engine oil temperature sensor

—

—

—

Exhaust valve timing control does not function.

P0300
P0301
P0302
P0303
P0304

Misfire

×

—

—

—

P0500

Vehicle speed sensor

×

—

—

—

P0524

Engine oil pressure

—

—

—

• ECM illuminates oil pressure warning lamp on the combina-

tion meter.

• Engine speed will not rise more than 4,000rpm due to the 

fuel cut.

• Fail-safe is canceled when ignition switch OFF 

→

 ON.

P0603

ECM power supply circuit

—

×

—

—

P0605

ECM

—

—

—

ECM stops the electric throttle control actuator control, throttle 
valve is maintained at a fixed opening (approx. 5 degrees) by 
the return spring.

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.

P1078

Exhaust valve timing control 
position sensor circuit

×

—

×

—

P1568

Signal invalid

—

—

—

Active trace control does not function.

P1805

Brake switch

—

—

—

ECM controls the electric throttle control actuator by regulat-
ing 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

P2004

Intake manifold runner control 
valve

—

×

×

—

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.

P2101

Electric throttle control func-
tion

—

—

—

ECM stops the electric throttle control actuator control, throttle 
valve is maintained at a fixed opening (approx. 5 degrees) by 
the return spring.

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.

P2119

Electric throttle control actua-
tor

—

×

—

—

P2122
P2123
P2127
P2128
P2138

Accelerator pedal position 
sensor

—

—

—

The ECM controls the electric throttle control actuator in reg-
ulating 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.
So, the acceleration will be poor. 

DTC 

No.

Detected items

Vehicle behavior

Pattern

Others

A

B

C

EC-516

< ECU DIAGNOSIS INFORMATION >

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ECM

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

Priority

DTC

Detected items

1

U0101, U1001

CAN communication line

P0102, P0103

Mass air flow sensor

P0112, P0113

Intake air temperature sensor

P0117, P0118

Engine coolant temperature sensor

P0122, P0123, P0222, P0223, P1225, P1226, P2135

Throttle position sensor

P0197, P0198

Engine oil temperature sensor

P0327, P0328

Knock sensor

P0335

Crankshaft position sensor (POS)

P0340

Camshaft position sensor (PHASE)

P0500

Vehicle speed sensor

P0520

Engine oil pressure sensor

P0603, P0604, P0605, P0606, P0607, P060A, P060B

ECM

P0643

Sensor power supply

P0850

Transmission range switch

P1078

Exhaust valve timing control position sensor

P1610, P1611, P1612, P1615

NATS

P2014, P2016, P2017, P2018

Intake manifold runner control valve position sensor

P2122, P2123, P2127, P2128, P2138

Accelerator pedal position sensor

2

P0031, P0032

Air fuel ratio (A/F) sensor 1 heater

P0037, P0038

Heated oxygen sensor 2 heater

P0075

Intake valve timing control solenoid valve/Intake valve timing 
intermediate lock control solenoid valve

P0078

Exhaust valve timing control solenoid valve

P0130, P0131, P0132, P014C, P014D

Air fuel ratio (A/F) sensor 1

P0137, P0138

Heated oxygen sensor 2

P0444

EVAP canister purge volume control solenoid valve

P1217

Engine over temperature (OVERHEAT)

P1805

Brake switch

P2004

Intake manifold runner control valve

P2100, P2103

Throttle control motor relay

P2101

Electric throttle control function

P2118

Throttle control motor