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Nissan Frontier. Manual - part 609

DIAGNOSIS SYSTEM (ECM)

EC-1007

< SYSTEM DESCRIPTION >

[VQ40DE FOR MEXICO]

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.

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

function. Refer to

EC-1031, "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.

PBIB3005E

Number

Flashes

EC-1008

< SYSTEM DESCRIPTION >

[VQ40DE FOR MEXICO]

DIAGNOSIS SYSTEM (ECM)

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:0000000009481703

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-1031, "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.

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

seconds and then turn it ON (engine stopped) again.

• If the DTC is not for A/T related items (see

EC-1031, "DTC Index"

), skip step 1.

1. Erase DTC in TCM. Refer to

EC-1031, "DTC Index"

2. Select “ENGINE” with CONSULT.
3. Select “SELF-DIAG RESULTS”.
4. Touch “ERASE”. (DTC in ECM will be erased.)

Freeze Frame Data and 1st Trip Freeze Frame Data

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

The use of this mode enables quick and accurate performance of Confirmation Procedure.

DIAGNOSIS SYSTEM (ECM)

EC-1009

< SYSTEM DESCRIPTION >

[VQ40DE FOR MEXICO]

*: 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

For reference values of the following items, refer to

EC-1017, "CONSULT Reference Value in Data Monitor

Mode"

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. (Refer

EC-1031, "DTC Index"

FUEL SYS-B1

• “Fuel injection system status” at the moment a malfunction is detected is displayed.
• One of in the following made 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

FUEL SYS-B2

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.

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 sched-

ule.

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.

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.

INT MANI PRES [kPa]

• Always a certain value is displayed.
• These items are displayed but are not applicable to this model.

COMBUST CONDI-
TION

Monitored item

Unit

Description

Remarks

ENG SPEED

rpm

• Indicates the engine speed computed from the sig-

nal of the crankshaft position sensor (POS) and
camshaft position sensor (PHASE).

• Accuracy becomes poor if engine speed

drops below the idle rpm.

• If the signal is interrupted while the en-

gine is running, an abnormal value may
be indicated.

MAS A/F SE-B1

• The signal voltage of the mass air flow sensor is

displayed.

• When the engine is stopped, a certain

value is indicated.

• When engine is runnning specification

range is indicated in “SPEC”.

B/FUEL SCHDL

• “Base fuel schedule” indicates the fuel injection

pulse width programmed into ECM, prior to any
learned on board correction.

• When engine is runnning specification

range is indicated in “SPEC”.

EC-1010

< SYSTEM DESCRIPTION >

[VQ40DE FOR MEXICO]

DIAGNOSIS SYSTEM (ECM)

A/F ALPHA-B1

• The mean value of the air-fuel ratio feedback cor-

rection factor per cycle is indicated.

• When the engine is stopped, a certain

value is indicated.

• When engine is runnning specification

range is indicated in “SPEC”.

• This data also includes the data for the

air-fuel ratio learning control.

A/F ALPHA-B2

COOLAN TEMP/S

°C or °F

• The engine coolant temperature (determined by

the signal voltage of the engine coolant tempera-
ture sensor) is displayed.

• When the engine coolant temperature

sensor is open or short-circuited, ECM
enters fail-safe mode. The engine cool-
ant temperature determined by the ECM
is displayed.

A/F SEN1 (B1)

• The A/F signal computed from the input signal of

the Air fuel ratio (A/F) sensor 1 is displayed.

A/F SEN1 (B2)

HO2S2 (B1)

• The signal voltage of the heated oxygen sensor 2

is displayed.

HO2S2 (B2)

HO2S2 MNTR(B1)

RICH/

LEAN

• Display of heated oxygen sensor 2 signal:

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.

HO2S2 MNTR(B2)

RICH/

LEAN

VHCL SPEED SE

km/h or

mph

• The vehicle speed computed from the vehicle

speed signal sent from combination meter is dis-
played.

BATTERY VOLT

• The power supply voltage of ECM is displayed.

ACCEL SEN 1

• The accelerator pedal position sensor signal volt-

age is displayed.

• ACCEL SEN 2 signal is converted by

ECM internally. Thus, it differs from ECM
terminal voltage signal.

ACCEL SEN 2

TP SEN 1-B1

• The throttle position sensor signal voltage is dis-

played.

• THRTL SEN 2 signal is converted by

ECM internally. Thus, it differs from ECM
terminal voltage signal.

TP SEN 2-B1

FUEL T/TMP SE

°C or °F

• The fuel temperature (determined by the signal

voltage of the fuel tank temperature sensor) is dis-
played.

INT/A TEMP SE

°C or °F

• The intake air temperature (determined by the sig-

nal voltage of the intake air temperature sensor) is
indicated.

EVAP SYS PRES

FUEL LEVEL SE

START SIGNAL

ON/OFF

• Indicates start signal status [ON/OFF] computed by

the ECM according to the signals of engine speed
and battery voltage.

• After starting the engine, [OFF] is dis-

played regardless of the starter signal.

CLSD THL POS

ON/OFF

• Indicates idle position [ON/OFF] computed by ECM

according 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.

P/N POSI SW

ON/OFF

• Indicates [ON/OFF] condition from the park/neutral

position (PNP) signal.

PW/ST SIGNAL

ON/OFF

• [ON/OFF] condition of the power steering system

(determined by the signal voltage of the power
steering pressure sensor signal) is indicated.

Monitored item

Unit

Description

Remarks

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