Infiniti FX35, FX50 (S51). Manual - part 796

 

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Infiniti FX35, FX50 (S51). Manual - part 796

 

 

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-725

< SYSTEM DESCRIPTION >

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*: Leaving cooling fan OFF with CONSULT-III while engine is running may cause the engine to overheat.

WORK SUPPORT MODE

Work Item

*: This function is not necessary in the usual service procedure.

DTC & SRT CONFIRMATION MODE

SRT STATUS Mode

For details, refer to 

EC-705, "Diagnosis Description"

.

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

INT V/T ASSIGN 
ANGLE

• Engine: Return to the original 

non-standard condition

• Change intake valve timing using 

CONSULT-III.

If malfunctioning symptom disap-
pears, see CHECK ITEM.

• Harness and connectors
• Intake valve timing control sole-

noid valve

IGNITION TIM-
ING

• Engine: Return to the original 

non-standard condition

• Timing light: Set
• Retard the ignition timing using 

CONSULT-III.

If malfunctioning symptom disap-
pears, see CHECK ITEM.

• Perform Idle Air Volume Learning.

TEST ITEM

CONDITION

JUDGMENT

CHECK ITEM (REMEDY)

WORK ITEM

CONDITION

USAGE

IDLE AIR VOL LEARN

• The idle air volume that keeps the engine speed within the 

specified range is memorized in ECM.

When learning the idle air volume

EVAP SYSTEM CLOSE

Close the EVAP canister vent control valve in order to make 
EVAP system close under the following conditions.
• Ignition switch ON
• Engine not running
• Ambient air temperature is above 0

°

C (32

°

F).

• No vacuum and no high pressure in EVAP system
• Fuel tank temperature is more than 0

°

C (32

°

F).

• Within 10 minutes after starting “EVAP SYSTEM CLOSE”
• When trying to execute “EVAP SYSTEM CLOSE” under 

the condition except above, CONSULT-III will discontinue 
it and display appropriate instruction.
NOTE:
When starting engine, CONSULT-III may display “Bat-
tery voltage is low. Charge battery”, even when using 
a charged battery.

When detecting EVAP vapor leak 
in the EVAP system

FUEL PRESSURE RELEASE

• Fuel pump will stop by touching “START” during idling.

Crank a few times after engine stalls.

When releasing fuel pressure from 
fuel line

SELF-LEARNING CONT

• The coefficient of self-learning control mixture ratio returns 

to the original coefficient.

When clearing mixture ratio self-
learning value

EXH V/T CONTROL LEARN

• In this mode, operation to learn exhaust valve timing con-

trol solenoid valve characteristic.

When learning the exhaust valve 
timing control

VIN REGISTRATION

• VIN can be registered in ECM.

When registering VIN in ECM

VVEL POS SEN ADJ PREP

• Use this item only when replacing VVEL actuator sub as-

sembly.

• Ignition switch ON and engine stopped

When adjusting VVEL control 
shaft position sensor 

TARGET IDLE RPM ADJ*

• Idle condition

When setting target idle speed

TARGET IGN TIM ADJ*

• Idle condition

When adjusting target ignition tim-
ing

EC-726

< SYSTEM DESCRIPTION >

[VK50VE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

*: DTC P1442 and P1456 does not apply to S51 models but appears in DTC Work Support Mode screens.

Diagnosis Tool Function

INFOID:0000000005237215

DESCRIPTION

Generic Scan Tool (OBD II scan tool) complying with SAE J1978/
ISO 15031-4 has 8 different functions explained below.
ISO 9141 is used as the protocol.
The name “GST” or “Generic Scan Tool” is used in this service man-
ual.

FUNCTION

Test mode

Test item

Corresponding DTC No.

Reference page

HO2S2

HO2S2 (B1) P1146

P0138

EC-826

HO2S2 (B1) P1147

P0137

EC-820

HO2S2 (B1) P0139

P0139

EC-834

HO2S2 (B2) P1166

P0158

EC-826

HO2S2 (B2) P1167

P0157

EC-820

HO2S2 (B2) P0159

P0159

EC-834

A/F SEN1

A/F SEN1 (B1) P1278/P1279

P0133

EC-815

A/F SEN1 (B1) P1276

P0130

EC-805

A/F SEN1 (B2) P1288/P1289

P0153

EC-815

A/F SEN1 (B2) P1286

P0150

EC-805

EVAPORATIVE SYSTEM

EVP SML LEAK P0442/P1442*

P0442

EC-893

P0455

EC-929

EVP V/S LEAK P0456/P1456*

P0456

EC-935

PURG VOL CN/V P1444

P0443

EC-899

PURG FLOW P0441

P0441

EC-888

SEF139P

Diagnostic Service

Function

Service $01

READINESS TESTS

This diagnostic service gains access to current emission-related data values, including an-
alog 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 that were stored by 
ECM during the freeze frame. For details, refer to 

EC-705, "Diagnosis Description"

.

Service $03

DTCs

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

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.

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-727

< SYSTEM DESCRIPTION >

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INSPECTION PROCEDURE

1.

Turn ignition switch OFF.

2.

Connect “GST” to data link connector (1), which is located under
LH dash panel near the hood opener handle.

3.

Turn ignition switch ON.

4.

Enter the program according to instruction on the screen or in
the operation manual.
(*: Regarding GST screens in this section, sample screens are
shown.)

5.

Perform each diagnostic mode according to each service proce-
dure.
For further information, see the GST Operation Manual of
the tool maker.

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, EVAP canister vent control valve can 
be closed.
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 Service

Function

JMBIA1510ZZ

SEF398S

SEF416S

EC-728

< DTC/CIRCUIT DIAGNOSIS >

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TROUBLE DIAGNOSIS - SPECIFICATION VALUE

DTC/CIRCUIT DIAGNOSIS

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Description

INFOID:0000000005237216

The specification (SP) value indicates the tolerance of the value that is displayed in “SPEC” in “DATA MONI-
TOR” mode of CONSULT-III during normal operation of the Engine Control System. When the value in “SPEC”
in “DATA MONITOR” mode is within the SP value, the Engine Control System is confirmed OK. When the
value in “SPEC” in “DATA MONITOR” mode is NOT within the SP value, the Engine Control System may have
one or more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not illuminate
the MIL.
The SP value will be displayed for the following three items:
• B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correc-

tion)

• A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)
• MAS A/F SE-B1/B2 (The signal voltage of the mass air flow sensor)

Component Function Check

INFOID:0000000005237217

1.

PRECONDITIONING

Check that all of the following conditions are satisfied.
TESTING CONDITION
• Vehicle driven distance: More than 5,000 km (3,107 miles)
• Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm

2

, 14.25 - 15.12 psi)

• Atmospheric temperature: 20 - 30

°

C (68 - 86

°

F)

• Engine coolant temperature: 75 - 95

°

C (167 - 203

°

F)

• Transmission: Warmed-up
- After the engine is warmed up to normal operating temperature, drive vehicle until “ATF TEMP 2” (A/T fluid

temperature sensor signal) indicates more than 60

°

C (140

°

F).

• Electrical load: Not applied
- Rear window defogger switch, air conditioner switch and lighting switch are OFF. Steering wheel is straight

ahead.

• Engine speed: Idle

>> GO TO 2.

2.

PERFORM SPEC IN DATA MONITOR MODE

 With CONSULT-III

NOTE:
Perform “SPEC” in “DATA MONITOR” mode in maximum scale display.
1.

Perform 

EC-576, "BASIC INSPECTION : Special Repair Requirement"

.

2.

Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2”, “MAS A/F SE-B1” and “MAS A/F SE-B2” in
“SPEC” of “DATA MONITOR” mode with CONSULT-III.

3.

Check that monitor items are within the SP value.

Is the measurement value within the SP value?

YES

>> INSPECTION END

NO

>> Go to 

EC-729, "Diagnosis Procedure"

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