Nissan Frontier D22. Manual — part 251

TROUBLE DIAGNOSIS

EC-107

[KA24DE]

C

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G

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EC

DATA MONITOR (SPEC) MODE
Monitored Item

NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

ACTIVE TEST MODE
Test Item

Monitored item [Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

ENG SPEED [rpm]

×

×

●

Indicates the engine speed computed
from the REF signal (180

° signal) of the

camshaft position sensor.

MAS A/F SE-B1 [V]

×

×

●

The signal voltage of the mass air flow
sensor specification is displayed.

●

When engine is running specification
range is indicated.

B/FUEL SCHDL
[msec]

●

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

●

When engine is running specification
range is indicated.

A/F ALPHA-B1 [%]

×

●

The mean value of the air-fuel ratio feed-
back correction factor per cycle is indi-
cated.

●

When engine is running specification
range is indicated.

●

This data also includes the data for the
air-fuel ratio learning control.

TEST ITEM

CONDITION

JUDGEMENT

CHECK ITEM (REMEDY)

FUEL INJEC-
TION

●

Engine: Return to the original
trouble condition

●

Change the amount of fuel injec-
tion using CONSULT-II.

If trouble symptom disappears, see
CHECK ITEM.

●

Harness and connector

●

Fuel injector

●

Heated oxygen sensor 1

IGNITION TIM-
ING

●

Engine: Return to the original
trouble condition

●

Timing light: Set

●

Retard the ignition timing using
CONSULT-II.

If trouble symptom disappears, see
CHECK ITEM.

●

Adjust initial ignition timing

IACV-AAC/V
OPENING

●

Engine: After warming up, idle the
engine.

●

Change the IACV-AAC valve
opening percent using CON-
SULT-II.

Engine speed changes according to
the opening percent.

●

Harness and connector

●

IACV-AAC valve

POWER BAL-
ANCE

●

Engine: After warming up, idle the
engine.

●

Air conditioner switch: OFF

●

Shift lever: P or N

●

Cut off each injector signal one at
a time using CONSULT-II.

Engine runs rough or dies.

●

Harness and connector

●

Compression

●

Fuel injector

●

Power transistor

●

Spark plugs

●

Ignition coils

ENG COOLANT
TEMP

●

Engine: Return to the original
trouble condition

●

Change the engine coolant tem-
perature indication using CON-
SULT-II.

If trouble symptom disappears, see
CHECK ITEM.

●

Harness and connector

●

Engine coolant temperature sen-
sor

●

Fuel injector

FUEL PUMP
RELAY

●

Ignition switch: ON
(Engine stopped)

●

Turn the fuel pump relay “ON”
and “OFF” using CONSULT-II and
listen to operating sound.

Fuel pump relay makes the operat-
ing sound.

●

Harness and connector

●

Fuel pump relay

EC-108

[KA24DE]

TROUBLE DIAGNOSIS

EGRC SOLE-
NOID VALVE

●

Ignition switch: ON

●

Turn EGRC-solenoid valve “ON”
and “OFF” using CONSULT-II and
listen to operating sound.

EGRC-solenoid valve makes an
operating sound.

●

Harness and connector

●

EGRC-solenoid valve

PURG VOL
CONT/V

●

Engine: After warming up, run
engine at 1,500 rpm.

●

Change the EVAP canister purge
volume control solenoid valve
opening percent using CON-
SULT-II.

Engine speed changes according to
the opening percent.

●

Harness and connector

●

EVAP canister purge volume
control solenoid valve

FUEL T/TEMP
SEN

●

Change the fuel tank temperature using CONSULT-II.

VENT CON-
TROL/V

●

Ignition switch: ON
(Engine stopped)

●

Turn solenoid valve “ON” and
“OFF” using CONSULT-II and lis-
ten to operating sound.

Solenoid valve makes an operating
sound.

●

Harness and connector

●

Solenoid valve

VC/V BYPASS/V

●

Ignition switch: ON
(Engine stopped)

●

Turn solenoid valve “ON” and
“OFF” using CONSULT-II and lis-
ten to operating sound.

Solenoid valve makes an operating
sound.

●

Harness and connector

●

Solenoid valve

TEST ITEM

CONDITION

JUDGEMENT

CHECK ITEM (REMEDY)

TROUBLE DIAGNOSIS

EC-109

[KA24DE]

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EC

DTC & SRT CONFIRMATION MODE
SRT STATUS Mode

For details, refer to

EC-53, "SYSTEM READINESS TEST (SRT) CODE"

.

SRT Work Support Mode

This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.

DTC Work Support Mode

REAL TIME DIAGNOSIS IN DATA MONITOR MODE (RECORDING VEHICLE DATA)
Description

CONSULT-II has two kinds of triggers and they can be selected by touching “SETTING” in “DATA MONITOR”
mode.

1.

“AUTO TRIG” (Automatic trigger):

–

The malfunction will be identified on the CONSULT-II screen in real time.
In other words, DTC/1st trip DTC and malfunction item will be displayed if the malfunction is detected by
ECM.
At the moment a malfunction is detected by ECM, “MONITOR” in “DATA MONITOR” screen is changed to
“Recording Data... xx%” as shown at left, and the data after the malfunction detection is recorded. Then
the percentage reached 100%, “REAL-TIME DIAG” screen is displayed. If “STOP” is touched on the
screen during “Recording Data... xx%”, “REAL-TIME DIAG” screen is also displayed.
The recording time after the malfunction detection and the recording speed can be changed by “TRIG-
GER POINT” and “RECORDING Speed”. Refer to CONSULT-II OPERATION MANUAL.

2.

“MANU TRIG” (Manual trigger):

–

DTC/1st trip DTC and malfunction item will not be displayed automatically on CONSULT-II screen even
though a malfunction is detected by ECM.
“DATA MONITOR” can be performed continuously even though a malfunction is detected.

Use these triggers as follows:

Operation

1.

“AUTO TRIG”

–

While trying to detect the DTC/1st trip DTC by performing the “DTC Confirmation Procedure”, be sure to
select to “DATA MONITOR (AUTO TRIG)” mode. You can confirm the malfunction at the moment it is
detected.

–

While narrowing down the possible causes, CONSULT-II should be set in “DATA MONITOR (AUTO
TRIG)” mode, especially in case the incident is intermittent.
When you are inspecting the circuit by gently shaking (or twisting) the suspicious connectors, components
and harness in the “DTC Confirmation Procedure”, the moment a malfunction is found the DTC/1st trip

TEST MODE

TEST ITEM

CONDITION

REFERENCE PAGE

EVAPORATIVE SYS-
TEM

PURG FLOW P0441

Refer to corresponding
trouble diagnosis for
DTC.

EC-304

EVAP SML LEAK P0442/P1442

EC-313

,

EC-466

EVAP V/S LEAK P0456/P1456

EC-366

,

EC-487

PURG VOL CN/V P1444

EC-468

VC CUT/V BP/V P1491

EC-507

HO2S1

HO2S1 (B1) P0133

EC-192

HO2S1 (B1) P0134

EC-202

HO2S1 (B1) P1143

EC-416

HO2S1 (B1) P1144

EC-421

HO2S2

HO2S2 (B1) P0139

EC-216

HO2S2 (B1) P1146

EC-426

HO2S2 (B1) P1147

EC-433

EGR SYSTEM

EGR SYSTEM P0400

EC-276

EGRC-BPT/VLV P0402

EC-287

EGR SYSTEM P1402

EC-457

EC-110

[KA24DE]

TROUBLE DIAGNOSIS

DTC will be displayed. (Refer to “INCIDENT SIMULATION TESTS” in

GI-25, "How to Perform Efficient

Diagnosis for an Electrical Incident"

.

2.

“MANU TRIG”

–

If the malfunction is displayed as soon as “DATA MONITOR” is selected, reset CONSULT-II to “MANU
TRIG”. By selecting “MANU TRIG” you can monitor and store the data. The data can be utilized for further
diagnosis, such as a comparison with the value for the normal operating condition.

Generic Scan Tool (GST)

UBS00D1M

DESCRIPTION

Generic Scan Tool (OBDII scan tool) complying with SAE J1978 has
8 different functions explained on the next page.
ISO9141 is used as the protocol.
The name “GST” or “Generic Scan Tool” is used in this service man-
ual.

FUNCTION

SEF720X

SEF139P

Diagnostic test mode

Function

MODE 1

READINESS TESTS

This mode gains access to current emission-related data values, including analog inputs
and outputs, digital inputs and outputs, and system status information.

MODE 2

(FREEZE DATA)

This mode gains access to emission-related data value which were stored by ECM during
the freeze frame. For details, refer to

EC-53, "FREEZE FRAME DATA AND 1ST TRIP

FREEZE FRAME DATA"

.

MODE 3

DTCs

This mode gains access to emission-related power train trouble codes which were stored
by ECM.