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Nissan Rogue. Manual - part 450

EC-68

< SYSTEM DESCRIPTION >

[QR25DE]

DIAGNOSIS SYSTEM (ECM)

NOTE:

Wait until the same DTC (or 1st trip DTC) appears to completely confirm all DTCs.

How to Read Self-diagnostic Results

The DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below.

The DTC and 1st trip DTC are displayed at the same time. If the MIL does not illuminate in diagnostic test

mode I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the MIL

illuminates in “malfunction warning” mode, it is a DTC; if two or more codes are displayed, they may be either

DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These unidentified codes can be identified by

using the CONSULT or GST. A DTC will be used as an example for how to read a code.

A particular trouble code can be identified by the number of four-digit numeral flashes per the following.

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 one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later

numeral appears on the display 1.3 seconds after the former numeral has disappeared.

A change from one trouble code to another occurs at an interval of 1.8-seconds OFF.

PBIB0092E

PBIB3005E

Number

Flashes

DIAGNOSIS SYSTEM (ECM)

EC-69

< SYSTEM DESCRIPTION >

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In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no mal-

function. Refer to

EC-96, "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.

• Diagnostic trouble codes

• 1st trip diagnostic trouble codes

• 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 “self-diagnostic results” mode.
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:0000000011277885

FUNCTION

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

Self Diagnostic Item

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

EC-96, "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”.

• When ECM detects a 1st trip DTC, 1t” is displayed for “TIME”.

• When ECM has detected a current DTC, “0” is displayed for “TIME”.

• If “TIME” is neither “0” nor “1t”, the DTC occurred in the past and ECM shows the number of times the vehi-

cle has been driven since the last detection of the DTC.

Diagnostic test mode

Function

Self Diagnostic Result

Self-diagnostic results such as 1st trip DTC, DTC 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 screen.

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

The status of system monitoring tests and the self-diagnosis status/results can be confirmed.

EC-70

< SYSTEM DESCRIPTION >

[QR25DE]

DIAGNOSIS SYSTEM (ECM)

How to Erase DTC and 1st Trip 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.

Freeze Frame Data and 1st Trip Freeze Frame Data

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

DATA MONITOR MODE

NOTE:

The following table includes information (items) inapplicable to this vehicle. For information (items) applicable

to this vehicle, refer to CONSULT display items.

Monitored Item

Freeze frame data item*

Description

DIAG TROUBLE CODE
[PXXXX]

• The engine control component part/control system has a trouble code that is displayed as PXXXX. (Re-

fer to

EC-96, "DTC Index"

FUEL SYS-B1

• “Fuel injection system status” at the moment a malfunction is detected is displayed.
- One of the following mode is displayed.
- Mode2: Open loop due to detected system malfunction
- Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
- Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control
- Mode5: Open loop - has not yet satisfied condition to go to closed loop

CAL/LD VALUE [%]

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

COOLANT TEMP
[

°C] or [°F]

• 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 schedule

than short-term fuel trim.

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.

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.

B/FUEL SCHDL [msec]

• The base fuel schedule 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-B2

• There items are displayed but are not applicable to this model.

L-FUEL TRM-B2 [%]

S-FUEL TRM-B2 [%]

INT MANI PRES [kPa]

COMBUST CONDITION

DIAGNOSIS SYSTEM (ECM)

EC-71

< SYSTEM DESCRIPTION >

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Monitored item

Unit

Monitor Item

Selection

Description

Remarks

ECU

IN-

PUT
SIG-

NALS

MAIN

SIG-

NAL

ENG SPEED

rpm

• Indicates the engine speed computed

from the signal of the crankshaft position
sensor (POS) and camshaft position sen-
sor (PHASE).

• Accuracy becomes poor if en-

gine speed drops below the
idle rpm.

• If the signal is interrupted while

the engine is running, an ab-
normal value may be indicat-
ed.

B/FUEL SCHDL

msec

• “Base fuel schedule” indicates the fuel in-

jection pulse width programmed into
ECM, prior to any learned on board cor-
rection.

• When engine is running, spec-

ification range is indicated in
“SPEC”.

A/F ALPHA-B1

• The mean value of the air-fuel ratio feed-

back correction factor per cycle is indicat-
ed.

• When the engine is stopped, a

certain value is indicated.

• When engine is running, spec-

ification range is indicated in
“SPEC”.

• This data also includes the

data for the air-fuel ratio learn-
ing control.

COOLAN TEMP/S

°C or °F

• The engine coolant temperature (deter-

mined by the signal voltage of the engine
coolant temperature sensor) is dis-
played.

• When the engine coolant tem-

perature sensor is open or
short-circuited, ECM enters
fail-safe mode. The engine
coolant temperature deter-
mined by the ECM is dis-
played.

A/F SEN1 (B1)

• The A/F signal computed from the input

signal of the air fuel ratio (A/F) sensor 1
is displayed.

HO2S2 (B1)

• The signal voltage of the heated oxygen

sensor 2 is displayed.

HO2S2 MNTR(B1)

RICH/LEAN

• Display of heated oxygen sensor 2 sig-

nal.

- RICH: means the amount of oxygen after

three way catalyst is relatively small.

- LEAN: means the amount of oxygen after

three way catalyst is relatively large.

• When the engine is stopped, a

certain value is indicated.

VHCL SPEED SE

km/h or mph

• The vehicle speed computed from the

vehicle speed signal sent from combina-
tion meter is displayed.

BATTERY VOLT

• The power supply voltage of ECM is dis-

played.

ACCEL SEN 1

• The accelerator pedal position sensor

signal voltage is displayed.

• ACCEL SEN 2 signal is con-

verted by ECM internally.
Thus, it differs from ECM ter-
minal voltage signal.

ACCEL SEN 2

TP SEN 1-B1

• The throttle position sensor signal volt-

age is displayed.

• TP SEN 2-B1 signal is convert-

ed by ECM internally. Thus, it
differs from ECM terminal volt-
age signal.

TP SEN 2-B1

FUEL T/TMP SE

°C or °F

• The fuel temperature (determined by the

signal voltage of the fuel tank tempera-
ture sensor) is displayed.

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