Nissan X-Trail 32. Manual - part 738

DIAGNOSIS SYSTEM (ECM)

EC-81

< SYSTEM DESCRIPTION >

[MR20DD]

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The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds consisting of an ON (0.6-sec-
onds) - OFF (0.6-seconds) cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-seconds ON and 0.3-seconds OFF cycle.
A change from upper digit numeral to lower one occurs at an interval of 1.0-second OFF. For example, the
10th-digit numeral flashes 1.3 seconds (0.3+1.0seconds) after hide of the 100th-digit numeral.
A change from one DTC to another occurs at an interval of 1.8-seconds OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no mal-
function. Refer to 

EC-109, "DTC Index"

.

How to Erase Self-diagnostic Results

By performing this procedure, ECM memory is erased and the following diagnostic information is erased as
well.
• DTC (Diagnostic trouble codes)
• 1st trip DTC
• Freeze frame data
• 1st trip freeze frame data
• System readiness test (SRT) codes
• Test values
NOTE:
Also, if a battery terminal is disconnected, ECM memory is erased and the diagnostic information as listed
above is erased. (The amount of time required for erasing may vary from a few seconds to several hours.)

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Turn ignition switch ON.

5.

Set ECM in the diagnostic test mode II (Self-diagnostic results).

6.

The diagnostic information has been erased from the backup memory in the ECM.
Fully depress the accelerator pedal and keep it depressed for more than 10 seconds.

7.

Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.

CONSULT Function

INFOID:0000000010775067

FUNCTION

*: The following emission-related diagnostic information is cleared when the ECM memory is erased.

• DTC (Diagnostic trouble codes)

• 1st trip diagnostic trouble codes

• Freeze frame data

• 1st trip freeze frame data

• System readiness test (SRT) codes

• Test  values

SELF DIAGNOSTIC RESULT MODE

Number

0

1

2

3

4

5

6

7

8

9

A

B

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Flashes

10

1

2

3

4

5

6

7

8

9

11

12

13

14

15

16

Diagnostic test mode

Function

Self Diagnostic Result

Self-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data 

can be read and erased quickly.

*

Data Monitor

Input/Output data in the ECM can be read.

Work Support

This mode enables a technician to adjust some devices faster and more accurately by following the in-
dications on the CONSULT unit.

Active Test

Diagnostic Test Mode in which CONSULT drives some actuators apart from the ECMs and also shifts 
some parameters in a specified range.

ECU Identification

ECM part number can be read.

DTC Work Support

SRT and operating condition to check DTC can be confirmed.

EC-82

< SYSTEM DESCRIPTION >

[MR20DD]

DIAGNOSIS SYSTEM (ECM)

Self Diagnostic Item

Regarding items of DTC and 1st trip DTC, refer to 

EC-109, "DTC Index"

.

How to Read DTC and 1st Trip DTC

DTCs and 1st trip DTCs related to the malfunction are displayed in “Self-diag results” mode with CONSULT.
“TIME” indicates the number of driving the vehicle after the last detection of DTC.
• When ECM has detected a current DTC, “0” is displayed for “TIME”.
• When ECM memorizes a 1st trip DTC, “1t” is displayed for “TIME”.
• If “TIME” is neither “0” nor “1t”, the DTC occurred in the past.

How to Erase DTC

NOTE:
If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10 sec-
onds and then turn it ON (engine stopped) again.
1.

Select “ENGINE” with CONSULT.

2.

Select “SELF-DIAG RESULTS” mode.

3.

Touch “ERASE”. (DTC in ECM will be erased.)

Freeze Frame Data and 1st Trip Freeze Frame Data

*1: The items are the same as those of 1st trip freeze frame data.

DATA MONITOR MODE

NOTE:

Freeze frame data item*

1

Description

DIAG TROUBLE CODE 
[PXXXX]

The engine control component part/control system has a trouble code displayed as PXXXX. (Refer to 

EC-109, "DTC Index"

.)

CAL/LD VALUE %]

The calculated load value at the moment a malfunction is detected is displayed.

COOLANT TEMP [

°

C]

The engine coolant temperature at the moment a malfunction is detected is displayed.

L-FUEL TRM-B1 %]

• “Long-term fuel trim” at the moment a malfunction is detected is displayed.
• The long-term fuel trim indicates much more gradual feedback compensation to the base fuel sched-

ule than short-term fuel trim.

L-FUEL TRM-B2 %]

S-FUEL TRM-B1 %]

• “Short-term fuel trim” at the moment a malfunction is detected is displayed.
• The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel 

schedule.

S-FUEL TRM-B2 %]

ENGINE SPEED [rpm]

The engine speed at the moment a malfunction is detected is displayed.

VEHICL SPEED [km/h] 
or [mph]

The vehicle speed at the moment a malfunction is detected is displayed.

ABSOL TH·P/S [%]

The throttle valve opening angle at the moment a malfunction is detected is displayed.

INJ PULSE [msec]

The basic injection quantity at the moment a malfunction is detected is displayed.

INT/A TEMP SE [

°

C] or 

[

°

F]

The intake air temperature at the moment a malfunction is detected is displayed.

FUEL SYS-B1

• “Fuel injection system status” at the moment a malfunction is detected is displayed.
• One of the following mode is displayed.
- MODE 2: Open loop due to detected system malfunction
- MODE 3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
- MODE 4: Closed loop - using oxygen sensor(s) as feedback for fuel control
- MODE 5: Open loop - has not yet satisfied condition to go to closed loop

FUEL SYS-B2

INT MANI PRES [kPa]

• Constant value is displayed.
• These items are displayed but are not applicable to this model.

COMBUST CONDITION

FUEL RAIL PRESSURE 
[MPa]

The fuel rail pressure at the moment a malfunction is detected is displayed.

TARGET FUEL RAIL 
PRESSURE [MPa]

The target fuel rail pressure at the moment a malfunction is detected is displayed.

BATTERY VOLTAGE [V]

The battery voltage at the moment a malfunction is detected is displayed.

FUEL LEVEL [%]

The fuel level at the moment a malfunction is detected is displayed.

DIAGNOSIS SYSTEM (ECM)

EC-83

< SYSTEM DESCRIPTION >

[MR20DD]

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• The following table includes information (items) inapplicable to this vehicle. For information (items) applica-

ble to this vehicle, refer to CONSULT display items.

• For reference values of the following items, refer to 

EC-89, "Reference Value"

.

Monitored Item

Monitored item

Unit

Description

Remarks

ENG SPEED

rpm

Indicates the engine speed computed from the signal of 
the crankshaft position sensor and camshaft position 
sensor.

Accuracy becomes poor if engine 
speed drops below the idle rpm.

MAS A/F SE-B1

V

The signal voltage of the mass air flow sensor is dis-
played.

• When the engine is stopped, a 

certain value is indicated.

• When engine is running, normal 

range is indicated in “SPEC”.

B/FUEL SCHDL

ms

“Base fuel schedule”indicates the fuel injection pulse 
width programmed into ECM, prior to any learned on 
board correction.

When engine is running, normal 
range is indicated in “SPEC”.

A/F ALPHA-B1

%

The mean value of the air-fuel ratio feedback correction 
factor per cycle is indicated.

• When the engine is stopped, a 

certain value is indicated.

• This data also includes the data 

for the air-fuel ratio learning con-
trol.

• When engine is running, normal 

range is indicated in “SPEC”.

COOLAN TEMP/S

°

C

The engine coolant temperature (determined by the sig-
nal voltage of the engine coolant temperature sensor) is 
displayed.

When the engine coolant tempera-
ture sensor is open or short-circuit-
ed, ECM enters fail-safe mode.The 
engine coolant temperature deter-
mined by the ECM is displayed.

A/F SEN1 (B1)

V

The A/F signal voltage computed from the input signal 
of the air fuel ratio (A/F) sensor 1 is displayed.

HO2S1 (B1)

V

The signal voltage of the heated oxygen sensor 2 is dis-
played.

VHCL SPEED SE

km/h

The vehicle speed computed from the vehicle speed 
signal sent from combination meter is displayed.

BATTERY VOLT

V

The power supply voltage of ECM is displayed.

ACCEL SEN 1

V

The signal voltage of the accelerator pedal position sen-
sor 1 is displayed.

ACCEL SEN 2

V

The converted value of the accelerator pedal position 
sensor signal voltage is displayed.

ACCEL SEN 2 signal is converted 
by ECM internally. Thus, they dif-
fers from ECM terminal voltage sig-
nal.

TP SEN 1-B1

V

The signal voltage of the throttle position sensor 1 B1 is 
displayed.

TP SEN 2-B1

V

The value converted from the signal voltage of the throt-
tle position sensor 2 B1 is displayed.

TP SEN 2-B1 signal is converted 
by ECM internally. Thus, they dif-
fers from ECM terminal voltage sig-
nal.

START SIGNAL

ON/

OFF

Indicates start signal status [ON/OFF] computed by the 
ECM according to the signals of engine speed and bat-
tery voltage.

After starting the engine, [OFF] is 
displayed regardless of the starter 
signal.

CLSD THL POS

ON/

OFF

Indicates idle position [ON/OFF] computed by ECM ac-
cording to the accelerator pedal position sensor signal.

AIR COND SIG

ON/

OFF

Indicates [ON/OFF] condition of the air conditioner 
switch as determined by the air conditioner signal.

PW/ST SIGNAL

ON/

OFF

Indicates [ON/OFF] condition of the power steering sys-
tem (determined by the signal voltage of the power 
steering pressure sensor signal).

EC-84

< SYSTEM DESCRIPTION >

[MR20DD]

DIAGNOSIS SYSTEM (ECM)

LOAD SIGNAL

ON/

OFF

Indicates [ON/OFF] condition of the electrical load sig-
nal.
• ON...Rear window defogger switch is ON or lighting 

switch is in 2nd position.

• OFF...Both rear window defogger switch and lighting 

switch are OFF.

IGNITION SW

ON/

OFF

Indicates [ON/OFF] condition from ignition switch sig-
nal.

HEATER FAN SW

ON/

OFF

Indicates [ON/OFF] condition from the heater blower 
ON signal.

BRAKE SW

ON/

OFF

Indicates [ON/OFF] condition from the stop lamp switch 
signal.

IGN TIMING

BTDC

Indicates the ignition timing computed by ECM accord-
ing to the input signals.

When the engine is stopped, a cer-
tain value is indicated.

COMBUSTION

NOTE:
These items are displayed but are not applicable to this 
model.

CAL/LD VALUE

%

“Calculated load value” indicates the value of the cur-
rent air flow divided by peak air flow.

MASS AIRFLOW

g/s

Indicates the mass air flow computed by ECM accord-
ing to the mass air flow sensor signal.

PURG VOL C/V

%

• Indicates the control value of the EVAP canister 

purge volume control solenoid valve computed by the 
ECM according to the input signals.

• The opening becomes larger as the value increases.

INT/V TIM (B1)

°

CA

• Indicates [

°

CA] of intake camshaft advance angle. 

EXH/V TIM B1

°

CA

• Indicates [

°

CA] of exhaust camshaft advance angle. 

INT/V SOL (B1)

%

• The control value of the intake valve timing control 

solenoid valve (determined by ECM according to the 
input signals) is indicated.

• The advance angle becomes larger as the value in-

creases.

VTC DTY EX B1

%

• The control value of the exhaust valve timing control 

solenoid valve (determined by ECM according to the 
input signals) is indicated.

• The advance angle becomes larger as the value in-

creases.

SWRL CONT S/V

*

ON/

OFF

• The control condition of the intake manifold runner 

control valve (determined by ECM according to the 
input signals) is indicated.

- On: Closed
- Off:  Open

AIR COND RLY

ON/

OFF

The air conditioner relay control condition (determined 
by ECM according to the input signals) is indicated.

FUEL PUMP RELAY

ON/

OFF

• Indicates the fuel pump relay control condition deter-

mined by ECM according to the input signals.

THRTL RELAY

ON/

OFF

Indicates the throttle control motor relay control condi-
tion determined by the ECM according to the input sig-
nals.

HO2S1 HTR (B1)

ON/

OFF

Indicates [ON/OFF] condition of heated oxygen sensor 
2 heater determined by ECM according to the input sig-
nals.

I/P PULLY SPD

rpm

Indicates the engine speed computed from the input 
shaft revolution signal.

VEHICLE SPEED

km/h

The vehicle speed computed from the vehicle speed 
signal sent from TCM is displayed.

Monitored item

Unit

Description

Remarks