Infiniti Q45. Manual - part 372

TROUBLE DIAGNOSIS

EC-127

Generic Scan Tool (GST) Function

NBS001R9

DESCRIPTION

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

FUNCTION

PBIB0197E

SEF139P

Diagnostic test mode

Function

Service $01

READINESS TESTS

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

Service $02

(FREEZE DATA)

This diagnostic service 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"

Service $03

DTCs

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

EC-128

TROUBLE DIAGNOSIS

INSPECTION PROCEDURE

Turn ignition switch OFF.

Connect GST to data link connector, which is located under LH
dash panel near the hood opener handle.

Turn ignition switch ON.

Enter the program according to instruction on the screen or in
the operation manual.

(*: Regarding GST screens in this section, sample screens are
shown.)

Service $04

CLEAR DIAG INFO

This diagnostic service can clear all emission-related diagnostic information. This
includes:

●

Clear number of diagnostic trouble codes (Service $01)

●

Clear diagnostic trouble codes (Service $03)

●

Clear trouble code for freeze frame data (Service $01)

●

Clear freeze frame data (Service $02)

●

Reset status of system monitoring test (Service $01)

●

Clear on board monitoring test results (Service $06 and $07)

Service $06

(ON BOARD TESTS)

This diagnostic service accesses the results of on board diagnostic monitoring tests of
specific components/systems that are not continuously monitored.

Service $07

(ON BOARD TESTS)

This diagnostic service enables the off board test drive to obtain test results for emission-
related powertrain components/systems that are continuously monitored during normal
driving conditions.

Service $08

—

This diagnostic service can close EVAP system in ignition switch ON position (Engine
stopped). When this diagnostic service is performed, the following parts can be opened or
closed.

●

EVAP canister vent control valve: closed

●

Vacuum cut valve bypass valve: open

In the following conditions, this diagnostic service cannot function.

●

Low ambient temperature

●

Low battery voltage

●

Engine running

●

Ignition switch OFF

●

Low fuel temperature

●

Too much pressure is applied to EVAP system

Service $09

(CALIBRATION ID)

This diagnostic service enables the off-board test device to request specific vehicle infor-
mation such as Vehicle Identification Number (VIN) and Calibration IDs.

Diagnostic test mode

Function

PBIB0196E

SEF398S

TROUBLE DIAGNOSIS

EC-129

Perform each diagnostic service according to each service pro-
cedure.

For further information, see the GST Operation Manual of the
tool maker.

CONSULT-II Reference Value in Data Monitor Mode

NBS001RA

Remarks:

●

Specification data are reference values.

●

Specification data are output/input values which are detected or supplied by the ECM at the connector.

* Specification data may not be directly related to their components signals/values/operations.
i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show the specification data in

spite of the ignition timing not being adjusted to the specification data. This IGN TIMING monitors the data calculated by the ECM
according to the signals input from the camshaft position sensor and other ignition timing related sensors.

SEF416S

MONITOR ITEM

CONDITION

SPECIFICATION

ENG SPEED

●

Run engine and compare CONSULT-II value with the tachometer indication.

Almost the same speed as
the tachometer indication.

MAS A/F SE-B1

See

EC-135, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"

B/FUEL SCHDL

See

EC-135, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"

A/F ALPHA-B1
A/F ALPHA-B2

See

EC-135, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"

COOLAN TEMP/S

●

Engine: After warming up

More than 70

C (158

A/F SEN1 (B1)
A/F SEN1 (B2)

●

Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5 V

HO2S2 (B1)
HO2S2 (B2)

●

Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.

–

Engine: After warming up

–

Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load

0 - 0.3V

←→

Approx. 0.6 -

1.0V

HO2S2 MNTR (B1)
HO2S2 MNTR (B2)

●

Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.

–

Engine: After warming up

–

Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load

LEAN

←→

RICH

VHCL SPEED SE

●

Turn drive wheels and compare CONSULT-II value with the speedometer indi-
cation.

Almost the same speed as
speedometer indication

BATTERY VOLT

●

Ignition switch: ON (Engine stopped)

11 - 14V

ACCEL SEN 1

●

Ignition switch: ON
(engine stopped)

Accelerator pedal: Fully released

0.5 - 1.0V

Accelerator pedal: Fully depressed

4.0 - 4.8V

ACCEL SEN 2*

●

Ignition switch: ON
(engine stopped)

Accelerator pedal: Fully released

0.3 - 1.2V

Accelerator pedal: Fully depressed

3.9 - 4.8V

THRTL SEN 1
THRTL SEN 2*

●

Ignition switch: ON
(Engine stopped)

●

Selector lever: D

Accelerator pedal: Fully released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

EVAP SYS PRES

●

Ignition switch: ON

Approx. 1.8 - 4.8V

START SIGNAL

●

Ignition switch: ON

→

START

→

OFF

→

OFF

CLSD THL POS

●

Ignition switch: ON
(Engine stopped)

Accelerator pedal: Fully released

Accelerator pedal: Slightly depressed

OFF

EC-130

TROUBLE DIAGNOSIS

AIR COND SIG

●

Engine: After warming up, idle the
engine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor operates.)

P/N POSI SW

●

Ignition switch: ON

Selector lever: P or N

Selector lever: Except above

OFF

PW/ST SIGNAL

●

Engine: After warming up, idle the
engine

Steering wheel: Not being turned
(Forward direction)

OFF

Steering wheel: Being turned

LOAD SIGNAL

●

Ignition switch: ON

Rear window defogger switch: ON
and/or
Lighting switch: 2nd position

Rear window defogger switch and lighting
switch: OFF

OFF

IGNITION SW

●

Ignition switch: ON

→

OFF

→

OFF

→

HEATER FAN SW

●

Engine: After warming up, idle the
engine

Heater fan switch: ON

Heater fan switch: OFF

OFF

BRAKE SW

●

Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

INJ PULSE-B1
INJ PULSE-B2

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

2.0 - 3.0 msec

2,000 rpm

1.9 - 2.9 msec

IGN TIMING

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

- 17

BTDC

2,000 rpm

- 45

BTDC

CAL/LD VALUE

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

15% - 35%

2,500 rpm

10% - 35%

MASS AIRFLOW

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

3.8 - 5.2 g·m/s

2,500 rpm

16.0 - 21.5 g·m/s

PURG VOL C/V

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

2,000 rpm

—

INT/V TIM (B1)
INT/V TIM (B2)

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

−

- 5

2,000 rpm

Approx. 0

- 20

INT/V SOL (B1)
INT/V SOL (B2)

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

0% - 2%

2,000 rpm

Approx. 25% - 50%

MONITOR ITEM

CONDITION

SPECIFICATION

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