Infiniti FX35, FX50 (S51). Manual - part 648

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-133

< 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 $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-134

< DTC/CIRCUIT DIAGNOSIS >

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TROUBLE DIAGNOSIS - SPECIFICATION VALUE

DTC/CIRCUIT DIAGNOSIS

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Description

INFOID:0000000005236734

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:0000000005236735

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 SE 1” (A/T

fluid temperature sensor signal) indicates more than 60

°

C (140

°

F).

• Electrical load: Not applied
- Rear window defogger switch, air conditioner switch, 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-20, "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-135, "Diagnosis Procedure"

.

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-135

< DTC/CIRCUIT DIAGNOSIS >

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Diagnosis Procedure

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OVERALL SEQUENCE

JMBIA1468GB

EC-136

< DTC/CIRCUIT DIAGNOSIS >

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TROUBLE DIAGNOSIS - SPECIFICATION VALUE

DETAILED PROCEDURE

1.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

With CONSULT-III

1.

Start engine.

2.

Confirm that the testing conditions are met. Refer to 

EC-134, "Component Function Check"

.

3.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that each
indication is within the SP value.

JMBIA0056GB